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CVE-2026-10512

X25519 x86_64 assembly final reduction leaves non-canonical field element

The X25519 x86_64 assembly implementation fails to clear the most significant bit during the final modular reduction, so the computed result may not be fully reduced modulo the field prime 2^255 - 19. This can leave the field element in a non-canonical form, producing an incorrect result from the scalar multiplication and potentially a wrong shared secret. The final carry-propagation chains in the x64 and AVX2 reduction routines could overflow into the top bit, and the high limb was not masked afterward, so the 255-bit field element was left non-canonical.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-7531

Use-after-free in PQC hybrid key-share handling

Use-after-free in PQC hybrid key-share handling. This is an incomplete-fix follow-up to CVE-2026-5460 (released in 5.9.1): a malicious TLS 1.3 server sending a truncated PQC hybrid KeyShare can still trigger the error cleanup path to operate on freed memory.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6731

X.509 name constraint bypass via Subject CN treated as a DNS name

X.509 name constraint bypass via the Subject Common Name when treated as a DNS-type name. A certificate whose Subject CN violates an issuing CA's DNS name constraints could be accepted.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6681

PKCS#7 decode ignores caller output buffer size, writing past buffer bounds

The PKCS#7 decode path ignores the caller-supplied output buffer size (outputSz), allowing decoded content to be written past the bounds of the provided buffer. This affects wolfSSL 5.9.0 and earlier and was fixed in the 5.9.1 release.

CVSS 4.0 · 1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6679

DTLS 1.3 ACK serialization heap buffer overflow via integer truncation

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 affects builds using DTLS 1.3 and wolfSSL version 5.9.0 and earlier. A fix was added to the 5.9.1 release.

CVSS 4.0 · 8.8 High EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6678

Integer underflow in wc_PKCS7_DecryptOri handling crafted Other Recipient Info

Integer underflow in wc_PKCS7_DecryptOri when handling crafted Other Recipient Info, leading to incorrect length handling during decryption.

CVSS 4.0 · 1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6450

CRL critical extension bypass in ParseCRL_Extensions

A CRL critical extension bypass exists in ParseCRL_Extensions where critical extensions are not properly enforced, allowing a crafted CRL with an unhandled critical extension to be accepted. This only affects builds with CRL support enabled and where a crafted CRL had a trusted signature when parsed.

CVSS 4.0 · 1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6412

Continued acceptance of SHA-1/MD5 digests in certificate processing

Certificate policy and RFC 8446 compliance concerns regarding the continued acceptance of SHA-1/MD5 in certificate processing.

CVSS 4.0 · 2.3 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-7511

PKCS7_verify signer confusion allows forged signatures to be accepted

PKCS7_verify signer confusion allows forged signatures, where the signer associated with a signature is not correctly bound, permitting a forged signature to be accepted.

CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-7532

iPAddress name constraints not enforced when WOLFSSL_IP_ALT_NAME is undefined

iPAddress name constraints bypass when WOLFSSL_IP_ALT_NAME 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.

CVSS 4.0 · 5.7 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-8720

HMAC-BLAKE2 final discards message when key length exceeds block size

wc_Blake2bHmacFinal and wc_Blake2sHmacFinal 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 accumulated message data, so the resulting MAC depended only on the key and not on the message being authenticated. This bug is specific to the HMAC-BLAKE2 APIs that were added in wolfSSL version 5.9.0.

CVSS 4.0 · 5.9 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-10098

OCSP CertID serial-number length-confusion in wolfSSL_OCSP_resp_find_status

OCSP CertID serial-number length-confusion in wolfSSL_OCSP_resp_find_status 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 serial numbers to be of equal length, so a SingleResponse for one certificate (same issuer) whose serial is a prefix of the target's serial would match, returning the wrong certificate's status. The fix requires the serial lengths to be equal before comparing the serial bytes.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-11703

Missing SNI/ALPN binding on stateful (session-ID) TLS session resumption

Missing SNI/ALPN binding on stateful (session-ID) resumption, which previously skipped the binding check performed for ticket-based resumption. A cached session could be resumed under a different SNI/ALPN than originally negotiated and, where client-authentication policy differs across virtual hosts, carry the cached peer-authentication state into a context it was not established for. Resumption now verifies the SNI/ALPN binding for all paths and declines (falling back to a full handshake) on mismatch.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-55962

TLS 1.3 post-handshake authentication: server accepts Finished without client Certificate/CertificateVerify

TLS 1.3 post-handshake authentication (PHA) issue where a server could accept a client's Finished message without the client having sent a Certificate and CertificateVerify. The post-handshake-auth exemption that allows an empty/absent peer certificate was only intended for the initial handshake, but it was also being applied while a post-handshake CertificateRequest was still outstanding. The check is now scoped to the initial handshake only: on the server, once a post-handshake CertificateRequest has been sent (certReqCtx is set), a peer certificate and a valid CertificateVerify are required again before the Finished is accepted, with empty-certificate handling following the configured verify mode (FAIL_IF_NO_PEER_CERT) just as during first-handshake client authentication. Only affects TLS 1.3 servers built with post-handshake authentication support (WOLFSSL_POST_HANDSHAKE_AUTH / --enable-postauth, included in --enable-all) that enable WOLFSSL_VERIFY_POST_HANDSHAKE and request a client certificate after the handshake via wolfSSL_request_certificate(). Clients, and servers that do not use post-handshake authentication, are unaffected.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6092

Encrypt-then-MAC could fall back to MAC-then-Encrypt when HAVE_ENCRYPT_THEN_MAC is configured

When HAVE_ENCRYPT_THEN_MAC is configured, the implementation could fall back to MAC-then-Encrypt rather than enforcing Encrypt-then-MAC.

CVSS 4.0 · 2.1 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6325

Out-of-bounds write in SetSuitesHashSigAlgo on oversized signature algorithms list

Out-of-bounds write in SetSuitesHashSigAlgo when processing an oversized signature algorithms list, allowing a write past the bounds of the destination buffer.

CVSS 4.0 · 2 Low EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6329

PKCS#12 MAC verification uses attacker-controlled comparison length

PKCS#12 MAC verification uses an attacker-controlled comparison length, weakening the integrity check on the MAC and allowing a mismatched MAC to be accepted. The PKCS#12 verify path compared the locally computed HMAC against the MAC parsed from the PKCS#12 structure using a length taken directly from the attacker-supplied input, without first verifying that it equals the length of the digest actually produced by the configured algorithm. A truncated or zero-length stored MAC could therefore be accepted, defeating the integrity protection of the MAC.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6330

ML-KEM ARM64 NEON ciphertext comparison only compares half of the input

The ML-KEM ARM64 NEON ciphertext comparison only compares half of the input, breaking the Fujisaki-Okamoto transform's implicit rejection and weakening IND-CCA2 security on that code path. The constant-time comparison effectively ignored part of the re-encrypted ciphertext, so a decapsulating party could fail to detect a manipulated ciphertext and proceed without the standard's required implicit rejection.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6094

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData parsing crafted PKCS7 EnvelopedData

Heap buffer overread in wc_PKCS7_DecodeEnvelopedData when parsing crafted PKCS7 EnvelopedData. This could theoretically be triggered by attacker-supplied data delivered via S/MIME or CMS.

CVSS 4.0 · 6.3 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl
CVE-2026-6291

Bleichenbacher padding oracle in PKCS#7 KTRI RSA PKCS#1 v1.5 decryption

Bleichenbacher padding oracle in PKCS#7 KTRI decryption. When decrypting PKCS#7 EnvelopedData using RSA PKCS#1 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 submit crafted EnvelopedData messages and observe error responses could use this as a padding oracle to incrementally recover the encrypted Content Encryption Key (CEK). The fix generates a deterministic pseudo-random fake CEK on padding failure (via HMAC-SHA256) and proceeds with decryption identically, using constant-time operations throughout, so that all failure paths produce the same error regardless of padding validity.

CVSS 4.0 · 6 Medium EPSS < 1% KEV · Not listed
Vendors
Wolfssl
Products
Wolfssl