Negotiate ambient user conn reuse

A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection...

HTTP/2 server push UAF

A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process...

CURL-CVE-2026-80229 OpenSSL provider use-after-free

When performing transfers via libcurl’s multi interface, pooled TLS connections can outlive their originating easy handles. In OpenSSL 3 provider configurations, libcurl attaches an allocated library context to the easy handle's state and passes it to OpenSSL without acquiring an ownership...

CURL-CVE-2026-18924 HTTP/2 server push UAF

A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process...

CURL-CVE-2026-13608 OpenLDAP SASL authentication bypass

A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle MITM attack can inject a premature or shortcut response that bypasses complete peer...

native CA store conn reuse

A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup for a given hostname even when using a different Native CA Store setting CURLSSLOPTNATIVECA than when the connection was created...

OpenLDAP SASL authentication bypass

A flaw in the libcurl SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker executing a Man-in-the-Middle MITM attack can inject a premature or shortcut response that bypasses complete peer...

OpenSSL provider use-after-free

When performing transfers via libcurl’s multi interface, pooled TLS connections can outlive their originating easy handles. In OpenSSL 3 provider configurations, libcurl attaches an allocated library context to the easy handle's state and passes it to OpenSSL without acquiring an ownership...

domain-scoped PSL domain cookie

When libpsl support is enabled, libcurl fails to enforce the Public Suffix List boundary check when processing a Set-Cookie header where the Domain attribute explicitly matches an origin host that is itself a public suffix e.g., Domain=co.uk set by co.uk. Instead of coercing it into a strict...

CURL-CVE-2026-82209 domain-scoped PSL domain cookie

When libpsl support is enabled, libcurl fails to enforce the Public Suffix List boundary check when processing a Set-Cookie header where the Domain attribute explicitly matches an origin host that is itself a public suffix e.g., Domain=co.uk set by co.uk. Instead of coercing it into a strict...

CURL-CVE-2026-80231 native CA store conn reuse

A flaw in libcurl makes it wrongly reuse an existing HTTPS connection setup for a given hostname even when using a different Native CA Store setting CURLSSLOPTNATIVECA than when the connection was created...

wolfSSL CA-cache hit overrides callback

With the wolfSSL backend, when CA caching is enabled and an CURLOPTSSLCTXFUNCTION callback replaces the trust store, libcurl can silently reinstall the cached store after the callback returns. A certificate trusted by the cached store but rejected by the callback-selected store is then incorrectl...

PT-2026-84652

Name of the Vulnerable Software and Affected Versions libcurl affected versions not specified Description A flaw exists where the software incorrectly reuses an HTTP connection setup for a specific hostname when using Negotiate authentication, specifically when the initial request is made with...

PT-2026-84655

Name of the Vulnerable Software and Affected Versions curl affected versions not specified Description An issue exists where libcurl fails to enforce public key pinning when CURLOPT PINNEDPUBLICKEY is used in conjunction with options that disable standard peer verification, specifically CURLOPT S...

PT-2026-84651

Name of the Vulnerable Software and Affected Versions libcurl affected versions not specified Description A flaw exists in the handling of HTTP/2 Server Push streams. When the parent handle is configured to share connections with other handles, a use-after-free condition can occur during the...

PT-2026-84654

Name of the Vulnerable Software and Affected Versions curl affected versions not specified Description A heap-use-after-free occurs when using libcurl's multi interface with OpenSSL 3 provider configurations. The issue arises because libcurl attaches an allocated library context to the easy...

PT-2026-84656

Name of the Vulnerable Software and Affected Versions curl affected versions not specified Description A flaw in libcurl causes the software to incorrectly reuse an existing HTTPS connection setup for a specific hostname, even if a different Native CA Store setting CURLSSLOPT NATIVE CA is used...

PT-2026-84658

Name of the Vulnerable Software and Affected Versions libcurl affected versions not specified Description When using the wolfSSL backend with CA caching enabled, a flaw exists where the CURLOPT SSL CTX FUNCTION callback can be overridden. If this callback replaces the trust store, libcurl may...

PT-2026-84650

Name of the Vulnerable Software and Affected Versions libcurl affected versions not specified Description A flaw in the SASL negotiation for LDAP authentication allows an incomplete handshake sequence to be misinterpreted as a successful cryptographic verification. An attacker performing a...

PT-2026-84659

Name of the Vulnerable Software and Affected Versions curl affected versions not specified Description When libpsl support is enabled, the software fails to enforce the Public Suffix List boundary check while processing a Set-Cookie header. This occurs when the Domain attribute explicitly matches...