1 files changed, 8 insertions, 2 deletions

diff --git a/src/lib/libcrypto/asn1/x_crl.c b/src/lib/libcrypto/asn1/x_crl.c
index 7ad8350f3d..19caf56cec 100644
--- a/src/lib/libcrypto/asn1/x_crl.c
+++ b/src/lib/libcrypto/asn1/x_crl.c
@@ -1,4 +1,4 @@
-/* $OpenBSD: x_crl.c,v 1.48 2025/02/27 20:13:41 tb Exp $ */
+/* $OpenBSD: x_crl.c,v 1.50 2025/07/10 18:48:31 tb Exp $ */
 /* Copyright (C) 1995-1998 Eric Young (eay@cryptsoft.com)
  * All rights reserved.
  *
@@ -61,11 +61,11 @@
 #include <openssl/opensslconf.h>
 
 #include <openssl/asn1t.h>
-#include <openssl/err.h>
 #include <openssl/x509.h>
 #include <openssl/x509v3.h>
 
 #include "asn1_local.h"
+#include "err_local.h"
 #include "x509_local.h"
 
 static void setup_idp(X509_CRL *crl, ISSUING_DIST_POINT *idp);
@@ -540,6 +540,12 @@ LCRYPTO_ALIAS(X509_CRL_add0_revoked);
 int
 X509_CRL_verify(X509_CRL *crl, EVP_PKEY *pkey)
 {
+        /*
+         * The CertificateList's signature AlgorithmIdentifier must match
+         * the one inside the TBSCertList, see RFC 5280, 5.1.1.2, 5.1.2.2.
+         */
+        if (X509_ALGOR_cmp(crl->sig_alg, crl->crl->sig_alg) != 0)
+                return 0;
         return ASN1_item_verify(&X509_CRL_INFO_it, crl->sig_alg, crl->signature,
             crl->crl, pkey);
 }