JLSEC-2026-1222 When a libcurl-based application performs transfers via `SCP://` or `SFTP://` and utilizes the ...

When a libcurl-based application performs transfers via SCP:// or SFTP:// and utilizes the CURLOPTSSHKEYFUNCTION callback, it may silently accept an untrusted server. This vulnerability occurs when a server presents a host key type that does not match the specific key type already recorded for th...

JLSEC-2026-1208 When asked to both use a `.netrc` file for credentials and to follow HTTP redirects, libcurl...

When asked to both use a .netrc file for credentials and to follow HTTP redirects, libcurl could leak the password used for the first host to the followed-to host under certain circumstances...

JLSEC-2026-1218 libcurl had a flaw that when instructed to clear proxy authentication credentials which made it...

libcurl had a flaw that when instructed to clear proxy authentication credentials which made it not do so, leaving the old credentials around to get used for subsequent transfers that should not know nor use them...

JLSEC-2026-1197 A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream...

A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPTSTREAMDEPENDS or CURLOPTSTREAMDEPENDSE, subsequently invokes curleasyreset, and finally terminates the handle with curleasycleanup. During this final cleanup phase, libcurl...

JLSEC-2026-1212 libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate...

libcurl might in some circumstances reuse the wrong connection when asked to do Negotiate-authenticated ones, even when they are set to use different 'services'. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When...

JLSEC-2026-1207 Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request...

Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy handle but without the custom Host: header set, the second request would use stale information and pass on cookies meant for the first host in the second reques...

JLSEC-2026-1205 libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl...

libcurl might in some circumstances reuse the wrong connection for SMBS transfers. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid overhead. When reusing a connection a range of criteria must be met. Due to a logical error in the...

JLSEC-2026-1201 Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest**...

Successfully using libcurl to do a transfer to a specific HTTP origin hostA with Digest authentication and then changing the origin to a different one hostB for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Authorization: header field meant for hostA, to hostB...

JLSEC-2026-1216 When reusing a libcurl handle for sequential transfers driven by environment-variable proxy...

When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy authentication state between requests. Specifically, if the initial transfer authenticates against proxyA using Digest auth, a subsequent transfer routed...

JLSEC-2026-1210 Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest**...

Successfully using libcurl to do a transfer over a specific HTTP proxy proxyA with Digest authentication and then changing the proxy host to a second one proxyB for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Proxy-Authorization: header field meant for proxyA, to...

CVE-2026-8458

A flaw was found in libcurl. A logical error in the connection pooling mechanism may cause libcurl to reuse an authenticated connection for an unintended service. This could allow an application to wrongfully reuse an existing connection to the same server that was authenticated for a different...

curl: CVE-2026-18924: HTTP/2 server push UAF

A vulnerability was discovered in libcurl versions 8.21.0 and later, where a use-after-free issue could occur in the HTTP/2 server push functionality. The vulnerability was caused by the fact that when a pushed transfer ends, the connection's pool is not properly handled, leading to the freed...

CVE-2026-69246

Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, Guzzle gives a transport the request URI as text and supplies the Host header separately. The cURL handlers set CURLOPTURL to the URI exactly as written and push that Host into CURLOPTHTTPHEADER; StreamHandler does the same throu...

CVE-2026-69246

CVE-2026-69246 affects the PHP HTTP client Guzzle. Before versions 7.15.2 and 8.0.1, Guzzle passes the request URI to the transport as text and separately provides a Host header. The cURL handlers set CURLOPT_URL to the URI as written and push the Host into CURLOPT_HTTPHEADER; StreamHandler does ...

CVE-2026-69245: Incorrect Behavior Order: Validate Before Canonicalize

Guzzle is an extensible PHP HTTP client. Prior to 7.15.2 and 8.0.1, SetCookie::matchesDomain gives every subdomain of a cookie Domain that cookie unless SetCookie::matchesDomain recognizes the Domain as an IP literal or a numeric host, and the decision comes from the domain's own text, so two...

ROS-20260803-73-0008

The vulnerability of the Transport Layer Security TLS protocol implementation in the libcurl library is related to errors in security settings when the CURLOPTSSLCIPHERLIST configuration option is used. Exploiting this vulnerability may allow a malicious actor, operating remotely, to gain...

libcurl: libcurl: Information disclosure via cached SSL session and early data

A flaw was found in libcurl. An attacker can exploit this by replacing a legitimate HTTP/3 server with an impostor machine. When libcurl attempts a second transfer to the same site with a cached SSL session and early data enabled, it may send sensitive request data before verifying the server's...

K000162394: libcurl vulnerability CVE-2026-9080

Security Advisory Description Calling curleasypause within the event-based CURLMOPTSOCKETFUNCTION callback triggers a use-after-free vulnerability, where libcurl attempts to store a flag using a dangling struct pointer immediately after that pointer's memory has been freed. CVE-2026-9080 Impact...

EulerOS Virtualization 2.12.1 (EulerOS-SA-2026-2723)

According to the versions of the packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : Using libcurl, when a custom Host: header is first set for an HTTP request and a second request is subsequently done using the same easy...

OESA-2026-2986 curl security update

cURL is a computer software project providing a library libcurl and command-line tool curl for transferring data using various protocols. Security Fixes: A use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPTSTREAMDEPENDS or...