wolfssl

wolfSSL Embedded SSL/TLS Library The wolfSSL embedded SSL library formerly CyaSSL is a lightweight SSL/TLS library written in ANSI C and targeted for embedded, RTOS, and resource-constrained environments - primarily because of its small size, speed, and feature set. It is commonly used in standar...

CVE-2026-15442

In all builds that make use of DTLS, including default builds, there is a series of conditional states during the TLS shutdown which could lead to a heap-use-after free. If an application ended up getting a partial wolfSSLread which is sometimes caused by a small user buffer passed in, then calle...

EUVD-2026-87924

In all builds that make use of DTLS, including default builds, there is a series of conditional states during the TLS shutdown which could lead to a heap-use-after free. If an application ended up getting a partial wolfSSLread which is sometimes caused by a small user buffer passed in, then calle...

EUVD-2026-87923

In wolfSSL versions 5.7.2 through 5.9.2 there is a client-side implementation flaw in RFC 6961, multiple OCSP response stapling, which can lead to certificate forgery. When a wolfSSL client enables OCSP stapling with the HAVECERTIFICATESTATUSREQUESTV2 feature and calls wolfSSLUseOCSPStaplingV2ssl...

CVE-2026-89102

In wolfSSL versions 5.7.2 through 5.9.2 there is a client-side implementation flaw in RFC 6961, multiple OCSP response stapling, which can lead to certificate forgery. When a wolfSSL client enables OCSP stapling with the HAVECERTIFICATESTATUSREQUESTV2 feature and calls wolfSSLUseOCSPStaplingV2ssl...

CVE-2026-89133

wolfSSL versions 5.9.2 and earlier contain a flaw in the X.509 certificate validation logic where it fails to properly enforce NameConstraints extensions when there is an unconstrained CA tier between a name-constrained intermediate CA and the leaf certificate. wolfSSL incorrectly accepted...

EUVD-2026-87922

wolfSSL versions 5.9.2 and earlier contain a flaw in the X.509 certificate validation logic where it fails to properly enforce NameConstraints extensions when there is an unconstrained CA tier between a name-constrained intermediate CA and the leaf certificate. wolfSSL incorrectly accepted...

CVE-2026-89134

A certificate with no dNSName SAN but another SAN type present e.g. registeredID or iPAddress bypassed the Subject CN dNSName name-constraint check. The CN-as-DNS fallback was gated on cert-subjectCN != NULL && cert-altNames == NULL && !cert-isCA instead of "no dNSName SAN", so an out-of-scope CN...

EUVD-2026-87913

A certificate with no dNSName SAN but another SAN type present e.g. registeredID or iPAddress bypassed the Subject CN dNSName name-constraint check. The CN-as-DNS fallback was gated on cert-subjectCN != NULL && cert-altNames == NULL && !cert-isCA instead of "no dNSName SAN", so an out-of-scope CN...

EUVD-2026-87912

A failed X509verifycert call permanently plants an unverified attacker CA in the shared CertManager, bypassing certificate validation in every type-blind sibling consumer native TLS, OCSP, CRL, direct CM verify. This affects version 5.8.4 through 5.9.2 of wolfSSL with the macros OPENSSLEXTRA &&...

CVE-2026-89135

A failed X509verifycert call permanently plants an unverified attacker CA in the shared CertManager, bypassing certificate validation in every type-blind sibling consumer native TLS, OCSP, CRL, direct CM verify. This affects version 5.8.4 through 5.9.2 of wolfSSL with the macros OPENSSLEXTRA &&...

EUVD-2026-87910

MatchTrustedPeer ignores the public key used, leading to forged CA clones passing verification. Affected builds are any that enable the macro WOLFSSLTRUSTPEERCERT and load CA certificates with wolfSSLCTXtrustpeercert or wolfSSLtrustpeercert. The peer must know the certificates being loaded to...

CVE-2026-93302

MatchTrustedPeer ignores the public key used, leading to forged CA clones passing verification. Affected builds are any that enable the macro WOLFSSLTRUSTPEERCERT and load CA certificates with wolfSSLCTXtrustpeercert or wolfSSLtrustpeercert. The peer must know the certificates being loaded to...

EUVD-2026-87909

A DTLS 1.2 client can accept a ChangeCipherSpec message before it has sent its ClientKeyExchange. No master secret has been derived at that point, so the client installs read keys derived from a known deterministic key and checks the server's Finished against that same key. An out-of-order...

CVE-2026-93304

A DTLS 1.2 client can accept a ChangeCipherSpec message before it has sent its ClientKeyExchange. No master secret has been derived at that point, so the client installs read keys derived from a known deterministic key and checks the server's Finished against that same key. An out-of-order...

EUVD-2026-87908

When an application enables both OCSP and CRL revocation checking on one WOLFSSLCTX or certificate manager, wolfSSL skips the CRL check for any peer certificate that carries no Authority Information Access OCSP URL, and accepts a certificate the loaded CRL lists as revoked. The soft-fail policy f...

CVE-2026-94417

When an application enables both OCSP and CRL revocation checking on one WOLFSSLCTX or certificate manager, wolfSSL skips the CRL check for any peer certificate that carries no Authority Information Access OCSP URL, and accepts a certificate the loaded CRL lists as revoked. The soft-fail policy f...

CVE-2026-94418

Under WOLFSSLSMALLCERTVERIFY, ProcessPeerCertParse runs the certificate signature check separately from the parse to keep peak memory down, then merges the two results, but it merged the signature result back only when the parse returned 0, so any parse error hid it. ParseCertRelative reaches its...

EUVD-2026-87907

Under WOLFSSLSMALLCERTVERIFY, ProcessPeerCertParse runs the certificate signature check separately from the parse to keep peak memory down, then merges the two results, but it merged the signature result back only when the parse returned 0, so any parse error hid it. ParseCertRelative reaches its...

EUVD-2026-87906

Without NOSESSIONCACHEREF, wolfSSLgetsession does not return a session object but a ClientSession reference of the form row, index, hashsessionID into the process-global SessionCache, and ClientSessionToSession validates it against that hash alone. Because the TLS 1.2 session ID is chosen by the...