CVE-2026-11999: Improper Certificate Validation

X.509 trust-chain bypass path-depth exhaustion in the OpenSSL compatibility certificate verifier wolfSSLX509verifycert. This affects only builds with --enable-opensslextra whose application calls X509verifycert with caller-supplied untrusted intermediates; for those users it is critical, otherwis...

PT-2026-52528

Name of the Vulnerable Software and Affected Versions wolfSSL affected versions not specified Description Partial-chain certificate verification may accept chains that terminate at a peer-supplied, untrusted intermediate certificate instead of a trusted anchor. This allows an attacker to present ...

CVE-2026-55961: Improper Verification of Cryptographic Signature

wolfSSLPKCS7verify returning success for a degenerate certs-only PKCS7 object that contains no signer. Such an object has empty signerInfos, so the underlying signed-data verification succeeds without authenticating any content. The compatibility-layer verify path now rejects the object when no...

CVE-2026-6291: Observable Timing Discrepancy

Bleichenbacher padding oracle in PKCS7 KTRI decryption. When decrypting PKCS7 EnvelopedData using RSA PKCS1 v1.5 key transport, wolfSSL returned distinguishable error codes depending on whether RSA padding validation failed versus whether the decrypted content was malformed. An attacker able to...

CVE-2026-8720: Improper Validation of Integrity Check Value

wcBlake2bHmacFinal and wcBlake2sHmacFinal discard the message when the key length exceeds the block size, producing a MAC that is independent of the input. When the supplied key is longer than the BLAKE2 block size the key-hashing branch reinitialized the running hash state, discarding the...

CVE-2026-11310: Improper Certificate Validation

X.509 trust-chain bypass in the OpenSSL compatibility certificate verifier wolfSSLX509verifycert. This affects only builds with --enable-opensslextra OPENSSLEXTRA and whose application validates certificates by calling X509verifycert with caller-supplied untrusted intermediate certificates; for...

CVE-2026-10098: Improper Certificate Validation

OCSP CertID serial-number length-confusion in wolfSSLOCSPrespfindstatus allows a same-issuer SingleResponse whose serial is a prefix of the target serial to be reported as the revocation status of a different certificate. The lookup compared serial-number bytes without first requiring the two...

wolfssl:cryptofuzz-sp-math-all: Heap-buffer-overflow in sp_tohex

Project: https://github.com/wolfssl/wolfssl.git Detailed Report: https://oss-fuzz.com/testcase?key=5903471470772224 Project: wolfssl Fuzzing Engine: libFuzzer Fuzz Target: cryptofuzz-sp-math-all Job Type: libfuzzerasanwolfssl Platform Id: linux Crash Type: Heap-buffer-overflow WRITE 1 Crash...

CVE-2026-5778

Integer underflow in wolfSSL packet sniffer = 5.9.0 allows an attacker to cause a program crash in the AEAD decryption path by injecting a TLS record shorter than the explicit IV plus authentication tag into traffic inspected by sslDecodePacket. The underflow wraps a 16-bit length to a large valu...

CVE-2026-5446

In wolfSSL, ARIA-GCM cipher suites used in TLS 1.2 and DTLS 1.2 reuse an identical 12-byte GCM nonce for every application-data record. Because wcAriaEncrypt is stateless and passes the caller-supplied IV verbatim to the MagicCrypto SDK with no internal counter, and because the explicit IV is...

CVE-2026-5393

Dual-Algorithm CertificateVerify out-of-bounds read. When processing a dual-algorithm CertificateVerify message, an out-of-bounds read can occur on crafted input. This can only occur when --enable-experimental and --enable-dual-alg-certs is used when building wolfSSL...

CVE-2026-5460

A heap use-after-free exists in wolfSSL's TLS 1.3 post-quantum cryptography PQC hybrid KeyShare processing. In the error handling path of TLSXKeyShareProcessPqcHybridClient in src/tls.c, the inner function TLSXKeyShareProcessPqcClientex frees a KyberKey object upon encountering an error. The call...

CVE-2026-5500

wolfSSL's wcPKCS7DecodeAuthEnvelopedData does not properly sanitize the AES-GCM authentication tag length received and has no lower bounds check. A man-in-the-middle can therefore truncate the mac field from 16 bytes to 1 byte, reducing the tag check from 2⁻¹²⁸ to 2⁻⁸...

wolfssl:cryptofuzz-sp-math-all-8bit: Use-of-uninitialized-value in sp_exptmod_ex

Project: https://github.com/wolfssl/wolfssl.git Detailed Report: https://oss-fuzz.com/testcase?key=6451249854873600 Project: wolfssl Fuzzing Engine: libFuzzer Fuzz Target: cryptofuzz-sp-math-all-8bit Job Type: libfuzzermsanwolfssl Platform Id: linux Crash Type: Use-of-uninitialized-value Crash...

wolfssl:cryptofuzz-sp-math-all-8bit: Heap-buffer-overflow in sp_invmod

Project: https://github.com/wolfssl/wolfssl.git Detailed Report: https://oss-fuzz.com/testcase?key=6721921176895488 Project: wolfssl Fuzzing Engine: libFuzzer Fuzz Target: cryptofuzz-sp-math-all-8bit Job Type: libfuzzerasani386wolfssl Platform Id: linux Crash Type: Heap-buffer-overflow READ 1 Cra...

wolfssl:cryptofuzz-sp-math-all-8bit: Heap-buffer-overflow in sp_invmod

Project: https://github.com/wolfssl/wolfssl.git Detailed Report: https://oss-fuzz.com/testcase?key=5869845400059904 Project: wolfssl Fuzzing Engine: libFuzzer Fuzz Target: cryptofuzz-sp-math-all-8bit Job Type: libfuzzerasani386wolfssl Platform Id: linux Crash Type: Heap-buffer-overflow WRITE 1...

ANT-2026-7DG11TPA · wolfssl/wolfssl · other

other critical CVE-2026-5194 Severity Claude critical · Security research firm - · Maintainer critical REPORT Anthropic's analysis of this finding, sealed at approval. ANT-2026-7DG11TPA: SECURITY: critical Universal ECDSA certificate forgery for arbitrary hosts ConfirmSignature in...

ANT-2026-JS5D1Z2X · wolfSSL/wolfssl · Buffer Overflow

buffer-overflow medium CVE-2026-5295 CVE-2026-6678 Severity Claude high · Security research firm high · Maintainer medium Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Calif. ANT-2026-JS5D1Z2X: Stack buffer...

ANT-2026-VV0PRKKV · wolfSSL · heap-buffer-overflow

heap-buffer-overflow medium CVE-2026-5447 GHSA-mx4j-fjqx-f8qj Severity Claude high · Security research firm medium · Maintainer medium Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Calif. ANT-2026-VV0PRKKV:...

ANT-2026-SB4PHA43 · wolfSSL · Cryptographic Nonce Reuse

crypto-failure medium CVE-2026-5446 GHSA-vgv9-mv66-mpc7 Severity Claude high · Security research firm high · Maintainer medium Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Calif. ANT-2026-SB4PHA43: ARIA-GCM Nonc...