diff --git a/doc/godebug.md b/doc/godebug.md
index b9abfea898837..e912784d92dcd 100644
--- a/doc/godebug.md
+++ b/doc/godebug.md
@@ -188,6 +188,9 @@ calling into Go code from C will enable DIT, and disable it before returning to
 C if it was not enabled when Go code was entered.
 This currently only affects arm64 programs. For all other platforms it is a no-op.
 
+Go 1.24 removed the `x509sha1` setting.  `crypto/x509` no longer supports verifying
+signatures on certificates that use SHA-1 based signature algorithms.
+
 ### Go 1.23
 
 Go 1.23 changed the channels created by package time to be unbuffered
diff --git a/src/crypto/x509/root_unix_test.go b/src/crypto/x509/root_unix_test.go
index 2ea69e252a240..e2b678d48b3fc 100644
--- a/src/crypto/x509/root_unix_test.go
+++ b/src/crypto/x509/root_unix_test.go
@@ -151,7 +151,6 @@ func TestLoadSystemCertsLoadColonSeparatedDirs(t *testing.T) {
 	rootPEMs := []string{
 		gtsRoot,
 		googleLeaf,
-		startComRoot,
 	}
 
 	var certDirs []string
diff --git a/src/crypto/x509/verify_test.go b/src/crypto/x509/verify_test.go
index 7f6b74b7a0f5b..a2de1ac470e0b 100644
--- a/src/crypto/x509/verify_test.go
+++ b/src/crypto/x509/verify_test.go
@@ -134,45 +134,6 @@ var verifyTests = []verifyTest{
 		// entry so the results don't match.
 		systemLax: true,
 	},
-	{
-		name:          "dnssec-exp",
-		leaf:          dnssecExpLeaf,
-		intermediates: []string{startComIntermediate},
-		roots:         []string{startComRoot},
-		currentTime:   1302726541,
-
-		// The StartCom root is not trusted by Windows when the default
-		// ServerAuth EKU is requested.
-		systemSkip: true,
-
-		expectedChains: [][]string{
-			{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
-		},
-	},
-	{
-		name:          "dnssec-exp/AnyEKU",
-		leaf:          dnssecExpLeaf,
-		intermediates: []string{startComIntermediate},
-		roots:         []string{startComRoot},
-		currentTime:   1302726541,
-		keyUsages:     []ExtKeyUsage{ExtKeyUsageAny},
-
-		expectedChains: [][]string{
-			{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
-		},
-	},
-	{
-		name:          "dnssec-exp/RootInIntermediates",
-		leaf:          dnssecExpLeaf,
-		intermediates: []string{startComIntermediate, startComRoot},
-		roots:         []string{startComRoot},
-		currentTime:   1302726541,
-		systemSkip:    true, // see dnssec-exp test
-
-		expectedChains: [][]string{
-			{"dnssec-exp", "StartCom Class 1", "StartCom Certification Authority"},
-		},
-	},
 	{
 		name:          "InvalidHash",
 		leaf:          googleLeafWithInvalidHash,
@@ -227,15 +188,15 @@ var verifyTests = []verifyTest{
 		leaf:          nameConstraintsLeaf,
 		intermediates: []string{nameConstraintsIntermediate1, nameConstraintsIntermediate2},
 		roots:         []string{globalSignRoot},
-		currentTime:   1382387896,
-		dnsName:       "secure.iddl.vt.edu",
+		currentTime:   1524771953,
+		dnsName:       "udctest.ads.vt.edu",
 
 		expectedChains: [][]string{
 			{
-				"Technology-enhanced Learning and Online Strategies",
+				"udctest.ads.vt.edu",
 				"Virginia Tech Global Qualified Server CA",
-				"Trusted Root CA G2",
-				"GlobalSign Root CA",
+				"Trusted Root CA SHA256 G2",
+				"GlobalSign",
 			},
 		},
 	},
@@ -552,10 +513,6 @@ func testVerify(t *testing.T, test verifyTest, useSystemRoots bool) {
 }
 
 func TestGoVerify(t *testing.T) {
-	// Temporarily enable SHA-1 verification since a number of test chains
-	// require it. TODO(filippo): regenerate test chains.
-	t.Setenv("GODEBUG", "x509sha1=1")
-
 	for _, test := range verifyTests {
 		t.Run(test.name, func(t *testing.T) {
 			testVerify(t, test, false)
@@ -724,128 +681,6 @@ c78zEqNswn6xGKXpWF5xVwdFcsx9HKhJ6UAi2bQ/KQ1yb7LPUOR6wXXWrG1cLnNP
 i8eNLnKL9PXQ+5SwJFCzfEhcIZuhzg==
 -----END CERTIFICATE-----`
 
-const dnssecExpLeaf = `-----BEGIN CERTIFICATE-----
-MIIGzTCCBbWgAwIBAgIDAdD6MA0GCSqGSIb3DQEBBQUAMIGMMQswCQYDVQQGEwJJ
-TDEWMBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMiU2VjdXJlIERpZ2l0
-YWwgQ2VydGlmaWNhdGUgU2lnbmluZzE4MDYGA1UEAxMvU3RhcnRDb20gQ2xhc3Mg
-MSBQcmltYXJ5IEludGVybWVkaWF0ZSBTZXJ2ZXIgQ0EwHhcNMTAwNzA0MTQ1MjQ1
-WhcNMTEwNzA1MTA1NzA0WjCBwTEgMB4GA1UEDRMXMjIxMTM3LWxpOWE5dHhJRzZM
-NnNyVFMxCzAJBgNVBAYTAlVTMR4wHAYDVQQKExVQZXJzb25hIE5vdCBWYWxpZGF0
-ZWQxKTAnBgNVBAsTIFN0YXJ0Q29tIEZyZWUgQ2VydGlmaWNhdGUgTWVtYmVyMRsw
-GQYDVQQDExJ3d3cuZG5zc2VjLWV4cC5vcmcxKDAmBgkqhkiG9w0BCQEWGWhvc3Rt
-YXN0ZXJAZG5zc2VjLWV4cC5vcmcwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEK
-AoIBAQDEdF/22vaxrPbqpgVYMWi+alfpzBctpbfLBdPGuqOazJdCT0NbWcK8/+B4
-X6OlSOURNIlwLzhkmwVsWdVv6dVSaN7d4yI/fJkvgfDB9+au+iBJb6Pcz8ULBfe6
-D8HVvqKdORp6INzHz71z0sghxrQ0EAEkoWAZLh+kcn2ZHdcmZaBNUfjmGbyU6PRt
-RjdqoP+owIaC1aktBN7zl4uO7cRjlYFdusINrh2kPP02KAx2W84xjxX1uyj6oS6e
-7eBfvcwe8czW/N1rbE0CoR7h9+HnIrjnVG9RhBiZEiw3mUmF++Up26+4KTdRKbu3
-+BL4yMpfd66z0+zzqu+HkvyLpFn5AgMBAAGjggL/MIIC+zAJBgNVHRMEAjAAMAsG
-A1UdDwQEAwIDqDATBgNVHSUEDDAKBggrBgEFBQcDATAdBgNVHQ4EFgQUy04I5guM
-drzfh2JQaXhgV86+4jUwHwYDVR0jBBgwFoAU60I00Jiwq5/0G2sI98xkLu8OLEUw
-LQYDVR0RBCYwJIISd3d3LmRuc3NlYy1leHAub3Jngg5kbnNzZWMtZXhwLm9yZzCC
-AUIGA1UdIASCATkwggE1MIIBMQYLKwYBBAGBtTcBAgIwggEgMC4GCCsGAQUFBwIB
-FiJodHRwOi8vd3d3LnN0YXJ0c3NsLmNvbS9wb2xpY3kucGRmMDQGCCsGAQUFBwIB
-FihodHRwOi8vd3d3LnN0YXJ0c3NsLmNvbS9pbnRlcm1lZGlhdGUucGRmMIG3Bggr
-BgEFBQcCAjCBqjAUFg1TdGFydENvbSBMdGQuMAMCAQEagZFMaW1pdGVkIExpYWJp
-bGl0eSwgc2VlIHNlY3Rpb24gKkxlZ2FsIExpbWl0YXRpb25zKiBvZiB0aGUgU3Rh
-cnRDb20gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkgUG9saWN5IGF2YWlsYWJsZSBh
-dCBodHRwOi8vd3d3LnN0YXJ0c3NsLmNvbS9wb2xpY3kucGRmMGEGA1UdHwRaMFgw
-KqAooCaGJGh0dHA6Ly93d3cuc3RhcnRzc2wuY29tL2NydDEtY3JsLmNybDAqoCig
-JoYkaHR0cDovL2NybC5zdGFydHNzbC5jb20vY3J0MS1jcmwuY3JsMIGOBggrBgEF
-BQcBAQSBgTB/MDkGCCsGAQUFBzABhi1odHRwOi8vb2NzcC5zdGFydHNzbC5jb20v
-c3ViL2NsYXNzMS9zZXJ2ZXIvY2EwQgYIKwYBBQUHMAKGNmh0dHA6Ly93d3cuc3Rh
-cnRzc2wuY29tL2NlcnRzL3N1Yi5jbGFzczEuc2VydmVyLmNhLmNydDAjBgNVHRIE
-HDAahhhodHRwOi8vd3d3LnN0YXJ0c3NsLmNvbS8wDQYJKoZIhvcNAQEFBQADggEB
-ACXj6SB59KRJPenn6gUdGEqcta97U769SATyiQ87i9er64qLwvIGLMa3o2Rcgl2Y
-kghUeyLdN/EXyFBYA8L8uvZREPoc7EZukpT/ZDLXy9i2S0jkOxvF2fD/XLbcjGjM
-iEYG1/6ASw0ri9C0k4oDDoJLCoeH9++yqF7SFCCMcDkJqiAGXNb4euDpa8vCCtEQ
-CSS+ObZbfkreRt3cNCf5LfCXe9OsTnCfc8Cuq81c0oLaG+SmaLUQNBuToq8e9/Zm
-+b+/a3RVjxmkV5OCcGVBxsXNDn54Q6wsdw0TBMcjwoEndzpLS7yWgFbbkq5ZiGpw
-Qibb2+CfKuQ+WFV1GkVQmVA=
------END CERTIFICATE-----`
-
-const startComIntermediate = `-----BEGIN CERTIFICATE-----
-MIIGNDCCBBygAwIBAgIBGDANBgkqhkiG9w0BAQUFADB9MQswCQYDVQQGEwJJTDEW
-MBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMiU2VjdXJlIERpZ2l0YWwg
-Q2VydGlmaWNhdGUgU2lnbmluZzEpMCcGA1UEAxMgU3RhcnRDb20gQ2VydGlmaWNh
-dGlvbiBBdXRob3JpdHkwHhcNMDcxMDI0MjA1NDE3WhcNMTcxMDI0MjA1NDE3WjCB
-jDELMAkGA1UEBhMCSUwxFjAUBgNVBAoTDVN0YXJ0Q29tIEx0ZC4xKzApBgNVBAsT
-IlNlY3VyZSBEaWdpdGFsIENlcnRpZmljYXRlIFNpZ25pbmcxODA2BgNVBAMTL1N0
-YXJ0Q29tIENsYXNzIDEgUHJpbWFyeSBJbnRlcm1lZGlhdGUgU2VydmVyIENBMIIB
-IjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAtonGrO8JUngHrJJj0PREGBiE
-gFYfka7hh/oyULTTRwbw5gdfcA4Q9x3AzhA2NIVaD5Ksg8asWFI/ujjo/OenJOJA
-pgh2wJJuniptTT9uYSAK21ne0n1jsz5G/vohURjXzTCm7QduO3CHtPn66+6CPAVv
-kvek3AowHpNz/gfK11+AnSJYUq4G2ouHI2mw5CrY6oPSvfNx23BaKA+vWjhwRRI/
-ME3NO68X5Q/LoKldSKqxYVDLNM08XMML6BDAjJvwAwNi/rJsPnIO7hxDKslIDlc5
-xDEhyBDBLIf+VJVSH1I8MRKbf+fAoKVZ1eKPPvDVqOHXcDGpxLPPr21TLwb0pwID
-AQABo4IBrTCCAakwDwYDVR0TAQH/BAUwAwEB/zAOBgNVHQ8BAf8EBAMCAQYwHQYD
-VR0OBBYEFOtCNNCYsKuf9BtrCPfMZC7vDixFMB8GA1UdIwQYMBaAFE4L7xqkQFul
-F2mHMMo0aEPQQa7yMGYGCCsGAQUFBwEBBFowWDAnBggrBgEFBQcwAYYbaHR0cDov
-L29jc3Auc3RhcnRzc2wuY29tL2NhMC0GCCsGAQUFBzAChiFodHRwOi8vd3d3LnN0
-YXJ0c3NsLmNvbS9zZnNjYS5jcnQwWwYDVR0fBFQwUjAnoCWgI4YhaHR0cDovL3d3
-dy5zdGFydHNzbC5jb20vc2ZzY2EuY3JsMCegJaAjhiFodHRwOi8vY3JsLnN0YXJ0
-c3NsLmNvbS9zZnNjYS5jcmwwgYAGA1UdIAR5MHcwdQYLKwYBBAGBtTcBAgEwZjAu
-BggrBgEFBQcCARYiaHR0cDovL3d3dy5zdGFydHNzbC5jb20vcG9saWN5LnBkZjA0
-BggrBgEFBQcCARYoaHR0cDovL3d3dy5zdGFydHNzbC5jb20vaW50ZXJtZWRpYXRl
-LnBkZjANBgkqhkiG9w0BAQUFAAOCAgEAIQlJPqWIbuALi0jaMU2P91ZXouHTYlfp
-tVbzhUV1O+VQHwSL5qBaPucAroXQ+/8gA2TLrQLhxpFy+KNN1t7ozD+hiqLjfDen
-xk+PNdb01m4Ge90h2c9W/8swIkn+iQTzheWq8ecf6HWQTd35RvdCNPdFWAwRDYSw
-xtpdPvkBnufh2lWVvnQce/xNFE+sflVHfXv0pQ1JHpXo9xLBzP92piVH0PN1Nb6X
-t1gW66pceG/sUzCv6gRNzKkC4/C2BBL2MLERPZBOVmTX3DxDX3M570uvh+v2/miI
-RHLq0gfGabDBoYvvF0nXYbFFSF87ICHpW7LM9NfpMfULFWE7epTj69m8f5SuauNi
-YpaoZHy4h/OZMn6SolK+u/hlz8nyMPyLwcKmltdfieFcNID1j0cHL7SRv7Gifl9L
-WtBbnySGBVFaaQNlQ0lxxeBvlDRr9hvYqbBMflPrj0jfyjO1SPo2ShpTpjMM0InN
-SRXNiTE8kMBy12VLUjWKRhFEuT2OKGWmPnmeXAhEKa2wNREuIU640ucQPl2Eg7PD
-wuTSxv0JS3QJ3fGz0xk+gA2iCxnwOOfFwq/iI9th4p1cbiCJSS4jarJiwUW0n6+L
-p/EiO/h94pDQehn7Skzj0n1fSoMD7SfWI55rjbRZotnvbIIp3XUZPD9MEI3vu3Un
-0q6Dp6jOW6c=
------END CERTIFICATE-----`
-
-const startComRoot = `-----BEGIN CERTIFICATE-----
-MIIHyTCCBbGgAwIBAgIBATANBgkqhkiG9w0BAQUFADB9MQswCQYDVQQGEwJJTDEW
-MBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMiU2VjdXJlIERpZ2l0YWwg
-Q2VydGlmaWNhdGUgU2lnbmluZzEpMCcGA1UEAxMgU3RhcnRDb20gQ2VydGlmaWNh
-dGlvbiBBdXRob3JpdHkwHhcNMDYwOTE3MTk0NjM2WhcNMzYwOTE3MTk0NjM2WjB9
-MQswCQYDVQQGEwJJTDEWMBQGA1UEChMNU3RhcnRDb20gTHRkLjErMCkGA1UECxMi
-U2VjdXJlIERpZ2l0YWwgQ2VydGlmaWNhdGUgU2lnbmluZzEpMCcGA1UEAxMgU3Rh
-cnRDb20gQ2VydGlmaWNhdGlvbiBBdXRob3JpdHkwggIiMA0GCSqGSIb3DQEBAQUA
-A4ICDwAwggIKAoICAQDBiNsJvGxGfHiflXu1M5DycmLWwTYgIiRezul38kMKogZk
-pMyONvg45iPwbm2xPN1yo4UcodM9tDMr0y+v/uqwQVlntsQGfQqedIXWeUyAN3rf
-OQVSWff0G0ZDpNKFhdLDcfN1YjS6LIp/Ho/u7TTQEceWzVI9ujPW3U3eCztKS5/C
-Ji/6tRYccjV3yjxd5srhJosaNnZcAdt0FCX+7bWgiA/deMotHweXMAEtcnn6RtYT
-Kqi5pquDSR3l8u/d5AGOGAqPY1MWhWKpDhk6zLVmpsJrdAfkK+F2PrRt2PZE4XNi
-HzvEvqBTViVsUQn3qqvKv3b9bZvzndu/PWa8DFaqr5hIlTpL36dYUNk4dalb6kMM
-Av+Z6+hsTXBbKWWc3apdzK8BMewM69KN6Oqce+Zu9ydmDBpI125C4z/eIT574Q1w
-+2OqqGwaVLRcJXrJosmLFqa7LH4XXgVNWG4SHQHuEhANxjJ/GP/89PrNbpHoNkm+
-Gkhpi8KWTRoSsmkXwQqQ1vp5Iki/untp+HDH+no32NgN0nZPV/+Qt+OR0t3vwmC3
-Zzrd/qqc8NSLf3Iizsafl7b4r4qgEKjZ+xjGtrVcUjyJthkqcwEKDwOzEmDyei+B
-26Nu/yYwl/WL3YlXtq09s68rxbd2AvCl1iuahhQqcvbjM4xdCUsT37uMdBNSSwID
-AQABo4ICUjCCAk4wDAYDVR0TBAUwAwEB/zALBgNVHQ8EBAMCAa4wHQYDVR0OBBYE
-FE4L7xqkQFulF2mHMMo0aEPQQa7yMGQGA1UdHwRdMFswLKAqoCiGJmh0dHA6Ly9j
-ZXJ0LnN0YXJ0Y29tLm9yZy9zZnNjYS1jcmwuY3JsMCugKaAnhiVodHRwOi8vY3Js
-LnN0YXJ0Y29tLm9yZy9zZnNjYS1jcmwuY3JsMIIBXQYDVR0gBIIBVDCCAVAwggFM
-BgsrBgEEAYG1NwEBATCCATswLwYIKwYBBQUHAgEWI2h0dHA6Ly9jZXJ0LnN0YXJ0
-Y29tLm9yZy9wb2xpY3kucGRmMDUGCCsGAQUFBwIBFilodHRwOi8vY2VydC5zdGFy
-dGNvbS5vcmcvaW50ZXJtZWRpYXRlLnBkZjCB0AYIKwYBBQUHAgIwgcMwJxYgU3Rh
-cnQgQ29tbWVyY2lhbCAoU3RhcnRDb20pIEx0ZC4wAwIBARqBl0xpbWl0ZWQgTGlh
-YmlsaXR5LCByZWFkIHRoZSBzZWN0aW9uICpMZWdhbCBMaW1pdGF0aW9ucyogb2Yg
-dGhlIFN0YXJ0Q29tIENlcnRpZmljYXRpb24gQXV0aG9yaXR5IFBvbGljeSBhdmFp
-bGFibGUgYXQgaHR0cDovL2NlcnQuc3RhcnRjb20ub3JnL3BvbGljeS5wZGYwEQYJ
-YIZIAYb4QgEBBAQDAgAHMDgGCWCGSAGG+EIBDQQrFilTdGFydENvbSBGcmVlIFNT
-TCBDZXJ0aWZpY2F0aW9uIEF1dGhvcml0eTANBgkqhkiG9w0BAQUFAAOCAgEAFmyZ
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-jhvh3TaHK0u7aNM5Zj2gJsfyOZEdUauCe37Vzlrk4gNXcGmXCPleWKYK34wGmkUW
-FjgKXlf2Ysd6AgXmvB618p70qSmD+LIU424oh0TDkBreOKk8rENNZEXO3SipXPJz
-ewT4F+irsfMuXGRuczE6Eri8sxHkfY+BUZo7jYn0TZNmezwD7dOaHZrzZVD1oNB1
-ny+v8OqCQ5j4aZyJecRDjkZy42Q2Eq/3JR44iZB3fsNrarnDy0RLrHiQi+fHLB5L
-EUTINFInzQpdn4XBidUaePKVEFMy3YCEZnXZtWgo+2EuvoSoOMCZEoalHmdkrQYu
-L6lwhceWD3yJZfWOQ1QOq92lgDmUYMA0yZZwLKMS9R9Ie70cfmu3nZD0Ijuu+Pwq
-yvqCUqDvr0tVk+vBtfAii6w0TiYiBKGHLHVKt+V9E9e4DGTANtLJL4YSjCMJwRuC
-O3NJo2pXh5Tl1njFmUNj403gdy3hZZlyaQQaRwnmDwFWJPsfvw55qVguucQJAX6V
-um0ABj6y6koQOdjQK/W/7HW/lwLFCRsI3FU34oH7N4RDYiDK51ZLZer+bMEkkySh
-NOsF/5oirpt9P/FlUQqmMGqz9IgcgA38corog14=
------END CERTIFICATE-----`
-
 const smimeLeaf = `-----BEGIN CERTIFICATE-----
 MIIIPDCCBiSgAwIBAgIQaMDxFS0pOMxZZeOBxoTJtjANBgkqhkiG9w0BAQsFADCB
 nTELMAkGA1UEBhMCRVMxFDASBgNVBAoMC0laRU5QRSBTLkEuMTowOAYDVQQLDDFB
@@ -971,168 +806,136 @@ QyYBNWNgVYkDOnXYukrZVP/u3oDYLdE41V4tC5h9Pmzb/CaIxw==
 -----END CERTIFICATE-----`
 
 var nameConstraintsLeaf = `-----BEGIN CERTIFICATE-----
-MIIHMTCCBRmgAwIBAgIIIZaV/3ezOJkwDQYJKoZIhvcNAQEFBQAwgcsxCzAJBgNV
-BAYTAlVTMREwDwYDVQQIEwhWaXJnaW5pYTETMBEGA1UEBxMKQmxhY2tzYnVyZzEj
-MCEGA1UECxMaR2xvYmFsIFF1YWxpZmllZCBTZXJ2ZXIgQ0ExPDA6BgNVBAoTM1Zp
-cmdpbmlhIFBvbHl0ZWNobmljIEluc3RpdHV0ZSBhbmQgU3RhdGUgVW5pdmVyc2l0
-eTExMC8GA1UEAxMoVmlyZ2luaWEgVGVjaCBHbG9iYWwgUXVhbGlmaWVkIFNlcnZl
-ciBDQTAeFw0xMzA5MTkxNDM2NTVaFw0xNTA5MTkxNDM2NTVaMIHNMQswCQYDVQQG
-EwJVUzERMA8GA1UECAwIVmlyZ2luaWExEzARBgNVBAcMCkJsYWNrc2J1cmcxPDA6
-BgNVBAoMM1ZpcmdpbmlhIFBvbHl0ZWNobmljIEluc3RpdHV0ZSBhbmQgU3RhdGUg
-VW5pdmVyc2l0eTE7MDkGA1UECwwyVGVjaG5vbG9neS1lbmhhbmNlZCBMZWFybmlu
-ZyBhbmQgT25saW5lIFN0cmF0ZWdpZXMxGzAZBgNVBAMMEnNlY3VyZS5pZGRsLnZ0
-LmVkdTCCASIwDQYJKoZIhvcNAQEBBQADggEPADCCAQoCggEBAKkOyPpsOK/6IuPG
-WnIBlVwlHzeYf+cUlggqkLq0b0+vZbiTXgio9/VCuNQ8opSoss7J7o3ygV9to+9Y
-YwJKVC5WDT/y5JWpQey0CWILymViJnpNSwnxBc8A+Q8w5NUGDd/UhtPx/U8/hqbd
-WPDYj2hbOqyq8UlRhfS5pwtnv6BbCTaY11I6FhCLK7zttISyTuWCf9p9o/ggiipP
-ii/5oh4dkl+r5SfuSp5GPNHlYO8lWqys5NAPoDD4fc/kuflcK7Exx7XJ+Oqu0W0/
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 -----END CERTIFICATE-----`
 
 var nameConstraintsIntermediate1 = `-----BEGIN CERTIFICATE-----
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+xoW9dfkWBQKAXCstXat3WJVilGXBFub6GoVZdnxTDipyMZhUT/vzXq2bPphjcdR5
+YGbmwyYmChfa
 -----END CERTIFICATE-----`
 
 var nameConstraintsIntermediate2 = `-----BEGIN CERTIFICATE-----
-MIIEXTCCA0WgAwIBAgILBAAAAAABNuk6OrMwDQYJKoZIhvcNAQEFBQAwVzELMAkG
-A1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jv
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-hoUVv3u8UxQH/WWbNhHq1RrIlg/0rBUfi/ziShYFSB7U+aLx5DxPphTFBiDquQGp
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-BgNVHRMBAf8EBTADAQH/MEcGA1UdIARAMD4wPAYEVR0gADA0MDIGCCsGAQUFBwIB
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-L2NybC5nbG9iYWxzaWduLm5ldC9yb290LmNybDA+BggrBgEFBQcBAQQyMDAwLgYI
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-VR0jBBgwFoAUYHtmGkUNl8qJUC99BM00qP/8/UswDQYJKoZIhvcNAQEFBQADggEB
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-2kYdh/Uj/waQXfqR0OgxQXL9Ct4ZM+JlR1avsNKXWL5AwYXAXCOB3J5PW2XOck7H
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-hcC8roQwkHT7HvfYBoc74FM=
+MIIEXDCCA0SgAwIBAgILBAAAAAABNumCOV0wDQYJKoZIhvcNAQELBQAwTDEgMB4G
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+Q0EgU0hBMjU2IEcyMIIBIjANBgkqhkiG9w0BAQEFAAOCAQ8AMIIBCgKCAQEAz80+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 -----END CERTIFICATE-----`
 
 var globalSignRoot = `-----BEGIN CERTIFICATE-----
-MIIDdTCCAl2gAwIBAgILBAAAAAABFUtaw5QwDQYJKoZIhvcNAQEFBQAwVzELMAkG
-A1UEBhMCQkUxGTAXBgNVBAoTEEdsb2JhbFNpZ24gbnYtc2ExEDAOBgNVBAsTB1Jv
-b3QgQ0ExGzAZBgNVBAMTEkdsb2JhbFNpZ24gUm9vdCBDQTAeFw05ODA5MDExMjAw
-MDBaFw0yODAxMjgxMjAwMDBaMFcxCzAJBgNVBAYTAkJFMRkwFwYDVQQKExBHbG9i
-YWxTaWduIG52LXNhMRAwDgYDVQQLEwdSb290IENBMRswGQYDVQQDExJHbG9iYWxT
-aWduIFJvb3QgQ0EwggEiMA0GCSqGSIb3DQEBAQUAA4IBDwAwggEKAoIBAQDaDuaZ
-jc6j40+Kfvvxi4Mla+pIH/EqsLmVEQS98GPR4mdmzxzdzxtIK+6NiY6arymAZavp
-xy0Sy6scTHAHoT0KMM0VjU/43dSMUBUc71DuxC73/OlS8pF94G3VNTCOXkNz8kHp
-1Wrjsok6Vjk4bwY8iGlbKk3Fp1S4bInMm/k8yuX9ifUSPJJ4ltbcdG6TRGHRjcdG
-snUOhugZitVtbNV4FpWi6cgKOOvyJBNPc1STE4U6G7weNLWLBYy5d4ux2x8gkasJ
-U26Qzns3dLlwR5EiUWMWea6xrkEmCMgZK9FGqkjWZCrXgzT/LCrBbBlDSgeF59N8
-9iFo7+ryUp9/k5DPAgMBAAGjQjBAMA4GA1UdDwEB/wQEAwIBBjAPBgNVHRMBAf8E
-BTADAQH/MB0GA1UdDgQWBBRge2YaRQ2XyolQL30EzTSo//z9SzANBgkqhkiG9w0B
-AQUFAAOCAQEA1nPnfE920I2/7LqivjTFKDK1fPxsnCwrvQmeU79rXqoRSLblCKOz
-yj1hTdNGCbM+w6DjY1Ub8rrvrTnhQ7k4o+YviiY776BQVvnGCv04zcQLcFGUl5gE
-38NflNUVyRRBnMRddWQVDf9VMOyGj/8N7yy5Y0b2qvzfvGn9LhJIZJrglfCm7ymP
-AbEVtQwdpf5pLGkkeB6zpxxxYu7KyJesF12KwvhHhm4qxFYxldBniYUr+WymXUad
-DKqC5JlR3XC321Y9YeRq4VzW9v493kHMB65jUr9TU/Qr6cf9tveCX4XSQRjbgbME
-HMUfpIBvFSDJ3gyICh3WZlXi/EjJKSZp4A==
+MIIDXzCCAkegAwIBAgILBAAAAAABIVhTCKIwDQYJKoZIhvcNAQELBQAwTDEgMB4G
+A1UECxMXR2xvYmFsU2lnbiBSb290IENBIC0gUjMxEzARBgNVBAoTCkdsb2JhbFNp
+Z24xEzARBgNVBAMTCkdsb2JhbFNpZ24wHhcNMDkwMzE4MTAwMDAwWhcNMjkwMzE4
+MTAwMDAwWjBMMSAwHgYDVQQLExdHbG9iYWxTaWduIFJvb3QgQ0EgLSBSMzETMBEG
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+hvcNAQEBBQADggEPADCCAQoCggEBAMwldpB5BngiFvXAg7aEyiie/QV2EcWtiHL8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 -----END CERTIFICATE-----`
 
 const digicertRoot = `-----BEGIN CERTIFICATE-----
diff --git a/src/crypto/x509/x509.go b/src/crypto/x509/x509.go
index 50433058f74c3..eaa171aeed765 100644
--- a/src/crypto/x509/x509.go
+++ b/src/crypto/x509/x509.go
@@ -799,18 +799,10 @@ var ErrUnsupportedAlgorithm = errors.New("x509: cannot verify signature: algorit
 
 // An InsecureAlgorithmError indicates that the [SignatureAlgorithm] used to
 // generate the signature is not secure, and the signature has been rejected.
-//
-// To temporarily restore support for SHA-1 signatures, include the value
-// "x509sha1=1" in the GODEBUG environment variable. Note that this option will
-// be removed in a future release.
 type InsecureAlgorithmError SignatureAlgorithm
 
 func (e InsecureAlgorithmError) Error() string {
-	var override string
-	if SignatureAlgorithm(e) == SHA1WithRSA || SignatureAlgorithm(e) == ECDSAWithSHA1 {
-		override = " (temporarily override with GODEBUG=x509sha1=1)"
-	}
-	return fmt.Sprintf("x509: cannot verify signature: insecure algorithm %v", SignatureAlgorithm(e)) + override
+	return fmt.Sprintf("x509: cannot verify signature: insecure algorithm %v", SignatureAlgorithm(e))
 }
 
 // ConstraintViolationError results when a requested usage is not permitted by
@@ -887,8 +879,6 @@ func signaturePublicKeyAlgoMismatchError(expectedPubKeyAlgo PublicKeyAlgorithm,
 	return fmt.Errorf("x509: signature algorithm specifies an %s public key, but have public key of type %T", expectedPubKeyAlgo.String(), pubKey)
 }
 
-var x509sha1 = godebug.New("x509sha1")
-
 // checkSignature verifies that signature is a valid signature over signed from
 // a crypto.PublicKey.
 func checkSignature(algo SignatureAlgorithm, signed, signature []byte, publicKey crypto.PublicKey, allowSHA1 bool) (err error) {
@@ -911,12 +901,9 @@ func checkSignature(algo SignatureAlgorithm, signed, signature []byte, publicKey
 	case crypto.MD5:
 		return InsecureAlgorithmError(algo)
 	case crypto.SHA1:
-		// SHA-1 signatures are mostly disabled. See go.dev/issue/41682.
+		// SHA-1 signatures are only allowed for CRLs and CSRs.
 		if !allowSHA1 {
-			if x509sha1.Value() != "1" {
-				return InsecureAlgorithmError(algo)
-			}
-			x509sha1.IncNonDefault()
+			return InsecureAlgorithmError(algo)
 		}
 		fallthrough
 	default:
diff --git a/src/crypto/x509/x509_test.go b/src/crypto/x509/x509_test.go
index 37553c5127b83..5ba6a5ad8345d 100644
--- a/src/crypto/x509/x509_test.go
+++ b/src/crypto/x509/x509_test.go
@@ -1817,8 +1817,8 @@ func TestInsecureAlgorithmErrorString(t *testing.T) {
 		want string
 	}{
 		{MD5WithRSA, "x509: cannot verify signature: insecure algorithm MD5-RSA"},
-		{SHA1WithRSA, "x509: cannot verify signature: insecure algorithm SHA1-RSA (temporarily override with GODEBUG=x509sha1=1)"},
-		{ECDSAWithSHA1, "x509: cannot verify signature: insecure algorithm ECDSA-SHA1 (temporarily override with GODEBUG=x509sha1=1)"},
+		{SHA1WithRSA, "x509: cannot verify signature: insecure algorithm SHA1-RSA"},
+		{ECDSAWithSHA1, "x509: cannot verify signature: insecure algorithm ECDSA-SHA1"},
 		{MD2WithRSA, "x509: cannot verify signature: insecure algorithm 1"},
 		{-1, "x509: cannot verify signature: insecure algorithm -1"},
 		{0, "x509: cannot verify signature: insecure algorithm 0"},
@@ -1899,11 +1899,6 @@ func TestSHA1(t *testing.T) {
 	if _, ok := err.(InsecureAlgorithmError); !ok {
 		t.Fatalf("certificate verification returned %v (%T), wanted InsecureAlgorithmError", err, err)
 	}
-
-	t.Setenv("GODEBUG", "x509sha1=1")
-	if err = cert.CheckSignatureFrom(cert); err != nil {
-		t.Fatalf("SHA-1 certificate did not verify with GODEBUG=x509sha1=1: %v", err)
-	}
 }
 
 // certMissingRSANULL contains an RSA public key where the AlgorithmIdentifier
diff --git a/src/internal/godebugs/table.go b/src/internal/godebugs/table.go
index da6ca78773761..a3c1b2dedd755 100644
--- a/src/internal/godebugs/table.go
+++ b/src/internal/godebugs/table.go
@@ -61,7 +61,6 @@ var All = []Info{
 	{Name: "winsymlink", Package: "os", Changed: 22, Old: "0"},
 	{Name: "x509keypairleaf", Package: "crypto/tls", Changed: 23, Old: "0"},
 	{Name: "x509negativeserial", Package: "crypto/x509", Changed: 23, Old: "1"},
-	{Name: "x509sha1", Package: "crypto/x509"},
 	{Name: "x509usefallbackroots", Package: "crypto/x509"},
 	{Name: "x509usepolicies", Package: "crypto/x509"},
 	{Name: "zipinsecurepath", Package: "archive/zip"},
diff --git a/src/runtime/metrics/doc.go b/src/runtime/metrics/doc.go
index cda2c6fc5ef6c..2e780e430d0a5 100644
--- a/src/runtime/metrics/doc.go
+++ b/src/runtime/metrics/doc.go
@@ -358,10 +358,6 @@ Below is the full list of supported metrics, ordered lexicographically.
 		package due to a non-default GODEBUG=x509negativeserial=...
 		setting.
 
-	/godebug/non-default-behavior/x509sha1:events
-		The number of non-default behaviors executed by the crypto/x509
-		package due to a non-default GODEBUG=x509sha1=... setting.
-
 	/godebug/non-default-behavior/x509usefallbackroots:events
 		The number of non-default behaviors executed by the crypto/x509
 		package due to a non-default GODEBUG=x509usefallbackroots=...