diff --git a/dlls/crypt32/tests/encode.c b/dlls/crypt32/tests/encode.c
index 3f5b7638d14..107ed3db497 100644
--- a/dlls/crypt32/tests/encode.c
+++ b/dlls/crypt32/tests/encode.c
@@ -5285,6 +5285,42 @@ static void compareCTLInfo(LPCSTR header, const CTL_INFO *expected,
     }
 }
 
+static const BYTE signedCTL[] = {
+0x30,0x81,0xc7,0x06,0x09,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x01,0x07,0x02,0xa0,
+0x81,0xb9,0x30,0x81,0xb6,0x02,0x01,0x01,0x31,0x0e,0x30,0x0c,0x06,0x08,0x2a,
+0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0x30,0x28,0x06,0x09,0x2a,0x86,
+0x48,0x86,0xf7,0x0d,0x01,0x07,0x01,0xa0,0x1b,0x04,0x19,0x30,0x17,0x30,0x00,
+0x18,0x0f,0x31,0x36,0x30,0x31,0x30,0x31,0x30,0x31,0x30,0x30,0x30,0x30,0x30,
+0x30,0x5a,0x30,0x02,0x06,0x00,0x31,0x77,0x30,0x75,0x02,0x01,0x01,0x30,0x1a,
+0x30,0x15,0x31,0x13,0x30,0x11,0x06,0x03,0x55,0x04,0x03,0x13,0x0a,0x4a,0x75,
+0x61,0x6e,0x20,0x4c,0x61,0x6e,0x67,0x00,0x02,0x01,0x01,0x30,0x0c,0x06,0x08,
+0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0x30,0x04,0x06,0x00,0x05,
+0x00,0x04,0x40,0xca,0xd8,0x32,0xd1,0xbd,0x97,0x61,0x54,0xd6,0x80,0xcf,0x0d,
+0xbd,0xa2,0x42,0xc7,0xca,0x37,0x91,0x7d,0x9d,0xac,0x8c,0xdf,0x05,0x8a,0x39,
+0xc6,0x07,0xc1,0x37,0xe6,0xb9,0xd1,0x0d,0x26,0xec,0xa5,0xb0,0x8a,0x51,0x26,
+0x2b,0x4f,0x73,0x44,0x86,0x83,0x5e,0x2b,0x6e,0xcc,0xf8,0x1b,0x85,0x53,0xe9,
+0x7a,0x80,0x8f,0x6b,0x42,0x19,0x93 };
+static const BYTE signedCTLWithCTLInnerContent[] = {
+0x30,0x82,0x01,0x0f,0x06,0x09,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x01,0x07,0x02,
+0xa0,0x82,0x01,0x00,0x30,0x81,0xfd,0x02,0x01,0x01,0x31,0x0e,0x30,0x0c,0x06,
+0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0x30,0x30,0x06,0x09,
+0x2b,0x06,0x01,0x04,0x01,0x82,0x37,0x0a,0x01,0xa0,0x23,0x30,0x21,0x30,0x00,
+0x18,0x0f,0x31,0x36,0x30,0x31,0x30,0x31,0x30,0x31,0x30,0x30,0x30,0x30,0x30,
+0x30,0x5a,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,0x86,0xf7,0x0d,0x02,0x05,0x05,
+0x00,0x31,0x81,0xb5,0x30,0x81,0xb2,0x02,0x01,0x01,0x30,0x1a,0x30,0x15,0x31,
+0x13,0x30,0x11,0x06,0x03,0x55,0x04,0x03,0x13,0x0a,0x4a,0x75,0x61,0x6e,0x20,
+0x4c,0x61,0x6e,0x67,0x00,0x02,0x01,0x01,0x30,0x0c,0x06,0x08,0x2a,0x86,0x48,
+0x86,0xf7,0x0d,0x02,0x05,0x05,0x00,0xa0,0x3b,0x30,0x18,0x06,0x09,0x2a,0x86,
+0x48,0x86,0xf7,0x0d,0x01,0x09,0x03,0x31,0x0b,0x06,0x09,0x2b,0x06,0x01,0x04,
+0x01,0x82,0x37,0x0a,0x01,0x30,0x1f,0x06,0x09,0x2a,0x86,0x48,0x86,0xf7,0x0d,
+0x01,0x09,0x04,0x31,0x12,0x04,0x10,0x54,0x71,0xbc,0xe1,0x56,0x31,0xa2,0xf9,
+0x65,0x70,0x34,0xf8,0xe2,0xe9,0xb4,0xf4,0x30,0x04,0x06,0x00,0x05,0x00,0x04,
+0x40,0x2f,0x1b,0x9f,0x5a,0x4a,0x15,0x73,0xfa,0xb1,0x93,0x3d,0x09,0x52,0xdf,
+0x6b,0x98,0x4b,0x13,0x5e,0xe7,0xbf,0x65,0xf4,0x9c,0xc2,0xb1,0x77,0x09,0xb1,
+0x66,0x4d,0x72,0x0d,0xb1,0x1a,0x50,0x20,0xe0,0x57,0xa2,0x39,0xc7,0xcd,0x7f,
+0x8e,0xe7,0x5f,0x76,0x2b,0xd1,0x6a,0x82,0xb3,0x30,0x25,0x61,0xf6,0x25,0x23,
+0x57,0x6c,0x0b,0x47,0xb8 };
+
 static void test_decodeCTL(DWORD dwEncoding)
 {
     static char oid1[] = "1.2.3";
@@ -5452,6 +5488,18 @@ static void test_decodeCTL(DWORD dwEncoding)
         LocalFree(buf);
         buf = NULL;
     }
+    /* A signed CTL isn't decodable, even if the inner content is a CTL */
+    SetLastError(0xdeadbeef);
+    ret = CryptDecodeObjectEx(dwEncoding, PKCS_CTL, signedCTL,
+     sizeof(signedCTL), CRYPT_DECODE_ALLOC_FLAG, NULL, (BYTE *)&buf, &size);
+    ok(!ret && GetLastError() == CRYPT_E_ASN1_BADTAG,
+     "expected CRYPT_E_ASN1_BADTAG, got %08x\n", GetLastError());
+    SetLastError(0xdeadbeef);
+    ret = CryptDecodeObjectEx(dwEncoding, PKCS_CTL,
+     signedCTLWithCTLInnerContent, sizeof(signedCTLWithCTLInnerContent),
+     CRYPT_DECODE_ALLOC_FLAG, NULL, (BYTE *)&buf, &size);
+    ok(!ret && GetLastError() == CRYPT_E_ASN1_BADTAG,
+     "expected CRYPT_E_ASN1_BADTAG, got %08x\n", GetLastError());
 }
 
 static const BYTE emptyPKCSContentInfo[] = { 0x30,0x04,0x06,0x02,0x2a,0x03 };