CVE-2026-7532: Improper Certificate Validation

iPAddress name constraints bypass when WOLFSSLIPALTNAME is not defined. IP address name constraints are not enforced in that configuration, allowing a certificate to bypass an issuing CA's IP address constraints...

CVE-2026-6679: Out-of-bounds Write

A heap buffer overflow could occur in the DTLS 1.3 ACK serialization path before the connecting peer is authenticated. The buffer overflow was due to an integer truncation when computing the length of the ACK record-number list, causing an undersized buffer to be allocated and then overrun. This...

CVE-2026-55964: Improper Certificate Validation

Chain intermediate CA:TRUE without keyCertSign accepted as a signing CA. Intermediate CA certificates are required to have the keyCertSign key usage when a Key Usage extension is present, but chain-supplied temporary CAs WOLFSSLTEMPCA added while building a certificate path were previously exempt...

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-2026-11999: 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...

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-2026-5460

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-2026-5393

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-2026-5500

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...

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-2026-0JRYQPCF · wolfSSL · heap-buffer-overflow

heap-buffer-overflow medium CVE-2026-5503 GHSA-65xm-pfx9-g5p3 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-2026-0JRYQPCF: wolfSSL...

ANT-2026-KNXJMVYC · wolfSSL · signature-bypass

signature-bypass high CVE-2026-5466 GHSA-47qf-hp3h-rwmm Severity Claude high · Security research firm high · Maintainer high Discovered by Claude Mythos Preview REPORT Anthropic's analysis, sealed at approval. Disclosure to the maintainer was performed by Calif. ANT-2026-KNXJMVYC: Universal ECCSI...

ANT-2026-K8YY7WWS · wolfSSL · improper-cert-validation

improper-cert-validation high CVE-2026-5501 GHSA-hg75-4cmp-f367 Severity Claude high · Security research firm high · Maintainer high Discovered by Claude Mythos Preview SECURITY RESEARCH FIRM ANALYSIS Triage and disclosure were performed by Calif. The writeup below is the document the firm sent t...

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...

curl: TLS verifyhost bypass in rustls, mbedTLS, and wolfSSL when verifypeer=0

The now-well-known CURLOPTSSLVERIFYHOST-bypass-when-CURLOPTSSLVERIFYPEER=0 defect exists in three of curl's TLS backends: rustls EXPERIMENTAL, mbedTLS, and wolfSSL DNS hostnames only. The documented contract at docs/libcurl/opts/CURLOPTSSLVERIFYPEER.md:57-59: The check that the host name in the...

curl: CURLOPT_PROXY_CRLFILE / CURLOPT_PROXY_ISSUERCERT / CURLOPT_PROXY_ISSUERCERT_BLOB silently ignored on backends that don't support them

From the Mythos report 2026-05-06 F1. CURLOPTPROXYCRLFILE / CURLOPTPROXYISSUERCERT / CURLOPTPROXYISSUERCERTBLOB silently ignored on backends that don't support them — severity Low https://github.com/curl/curl/blob/455bebc2c7/lib/setopt.cL1786-L1797...

JLSEC-2026-415 libcurl skips the certificate verification for a QUIC connection under certain conditions, when...

libcurl skips the certificate verification for a QUIC connection under certain conditions, when built to use wolfSSL. If told to use an unknown/bad cipher or curve, the error path accidentally skips the verification and returns OK, thus ignoring any certificate problems...