diff --git a/lib/internal/crypto/cfrg.js b/lib/internal/crypto/cfrg.js
index 826610a5fd6b8e..5dd4e44bdd06cc 100644
--- a/lib/internal/crypto/cfrg.js
+++ b/lib/internal/crypto/cfrg.js
@@ -242,6 +242,8 @@ async function cfrgImportKey(
         throw lazyDOMException('Invalid JWK keyData', 'DataError');
       if (keyData.kty !== 'OKP')
         throw lazyDOMException('Invalid key type', 'DataError');
+      if (keyData.crv !== name)
+        throw lazyDOMException('Subtype mismatch', 'DataError');
       const isPublic = keyData.d === undefined;
 
       if (usagesSet.size > 0 && keyData.use !== undefined) {
diff --git a/lib/internal/crypto/ec.js b/lib/internal/crypto/ec.js
index 980c0f57cb046e..809f531069bf8b 100644
--- a/lib/internal/crypto/ec.js
+++ b/lib/internal/crypto/ec.js
@@ -195,11 +195,12 @@ async function ecImportKey(
       break;
     }
     case 'jwk': {
-      let curve;
       if (keyData == null || typeof keyData !== 'object')
         throw lazyDOMException('Invalid JWK keyData', 'DataError');
       if (keyData.kty !== 'EC')
         throw lazyDOMException('Invalid key type', 'DataError');
+      if (keyData.crv !== namedCurve)
+        throw lazyDOMException('Named curve mismatch', 'DataError');
 
       if (keyData.d !== undefined) {
         verifyAcceptableEcKeyUse(name, 'private', usagesSet);
@@ -225,12 +226,13 @@ async function ecImportKey(
       if (algorithm.name === 'ECDSA' && keyData.alg !== undefined) {
         if (typeof keyData.alg !== 'string')
           throw lazyDOMException('Invalid alg', 'DataError');
+        let algNamedCurve;
         switch (keyData.alg) {
-          case 'ES256': curve = 'P-256'; break;
-          case 'ES384': curve = 'P-384'; break;
-          case 'ES512': curve = 'P-521'; break;
+          case 'ES256': algNamedCurve = 'P-256'; break;
+          case 'ES384': algNamedCurve = 'P-384'; break;
+          case 'ES512': algNamedCurve = 'P-521'; break;
         }
-        if (curve !== namedCurve)
+        if (algNamedCurve !== namedCurve)
           throw lazyDOMException('Named curve mismatch', 'DataError');
       }
 
diff --git a/test/parallel/test-webcrypto-export-import-cfrg.js b/test/parallel/test-webcrypto-export-import-cfrg.js
index c37c1535747917..531cb51c1b8b8c 100644
--- a/test/parallel/test-webcrypto-export-import-cfrg.js
+++ b/test/parallel/test-webcrypto-export-import-cfrg.js
@@ -259,6 +259,26 @@ async function testImportJwk({ name, publicUsages, privateUsages }, extractable)
         message: /key is not extractable/
       });
   }
+
+  for (const crv of [undefined, name === 'Ed25519' ? 'Ed448' : 'Ed25519']) {
+    await assert.rejects(
+      subtle.importKey(
+        'jwk',
+        { kty: jwk.kty, x: jwk.x, y: jwk.y, crv },
+        { name },
+        extractable,
+        publicUsages),
+      { message: /Subtype mismatch/ });
+
+    await assert.rejects(
+      subtle.importKey(
+        'jwk',
+        { kty: jwk.kty, d: jwk.d, x: jwk.x, y: jwk.y, crv },
+        { name },
+        extractable,
+        publicUsages),
+      { message: /Subtype mismatch/ });
+  }
 }
 
 (async function() {
diff --git a/test/parallel/test-webcrypto-export-import-ec.js b/test/parallel/test-webcrypto-export-import-ec.js
index 931323620c932c..ff3cb1e445cec3 100644
--- a/test/parallel/test-webcrypto-export-import-ec.js
+++ b/test/parallel/test-webcrypto-export-import-ec.js
@@ -260,6 +260,26 @@ async function testImportJwk(
         message: /key is not extractable/
       });
   }
+
+  for (const crv of [undefined, namedCurve === 'P-256' ? 'P-384' : 'P-256']) {
+    await assert.rejects(
+      subtle.importKey(
+        'jwk',
+        { kty: jwk.kty, x: jwk.x, y: jwk.y, crv },
+        { name, namedCurve },
+        extractable,
+        publicUsages),
+      { message: /Named curve mismatch/ });
+
+    await assert.rejects(
+      subtle.importKey(
+        'jwk',
+        { kty: jwk.kty, d: jwk.d, x: jwk.x, y: jwk.y, crv },
+        { name, namedCurve },
+        extractable,
+        publicUsages),
+      { message: /Named curve mismatch/ });
+  }
 }
 
 (async function() {