curl: PRE_PROXY change leaks stale Proxy Digest state across proxy-chain boundary

Summary After a Digest-authenticated HTTP proxy transfer, changing only CURLOPTPREPROXY on the same libcurl easy handle does not clear stale proxy Digest/auth state. If the new SOCKS pre-proxy resolves the same HTTP proxy hostname to a different proxy endpoint, the second proxy receives a...

curl: TFTP upload ignores --continue-at / CURLOPT_RESUME_FROM and leaks skipped local file prefix

Summary TFTP uploads ignore the configured resume offset. When a caller runs curl -C N -T file tftp://... or uses libcurl with CURLOPTUPLOAD and CURLOPTRESUMEFROM, curl should skip the first N bytes of the local source before uploading. Instead, the TFTP code sends the complete local file from by...

DEBIAN-CVE-2026-49129

Music Player Daemon MPD before version 0.24.11 contains a server-side request forgery vulnerability in CurlInputPlugin where CURLOPTFOLLOWLOCATION is set without CURLOPTREDIRPROTOCOLSSTR, allowing unauthenticated attackers to bypass the http/https scheme restriction by causing a malicious HTTP...

CVE-2026-49129

Music Player Daemon MPD before version 0.24.11 contains a server-side request forgery vulnerability in CurlInputPlugin where CURLOPTFOLLOWLOCATION is set without CURLOPTREDIRPROTOCOLSSTR, allowing unauthenticated attackers to bypass the http/https scheme restriction by causing a malicious HTTP...

UBUNTU-CVE-2026-49129

Music Player Daemon MPD before version 0.24.11 contains a server-side request forgery vulnerability in CurlInputPlugin where CURLOPTFOLLOWLOCATION is set without CURLOPTREDIRPROTOCOLSSTR, allowing unauthenticated attackers to bypass the http/https scheme restriction by causing a malicious HTTP...

CVE-2026-49129 Music Player Daemon < 0.24.11 SSRF via CurlInputPlugin

Music Player Daemon MPD before version 0.24.11 contains a server-side request forgery vulnerability in CurlInputPlugin where CURLOPTFOLLOWLOCATION is set without CURLOPTREDIRPROTOCOLSSTR, allowing unauthenticated attackers to bypass the http/https scheme restriction by causing a malicious HTTP...

CVE-2026-49129 Music Player Daemon < 0.24.11 SSRF via CurlInputPlugin

Music Player Daemon MPD before version 0.24.11 contains a server-side request forgery vulnerability in CurlInputPlugin where CURLOPTFOLLOWLOCATION is set without CURLOPTREDIRPROTOCOLSSTR, allowing unauthenticated attackers to bypass the http/https scheme restriction by causing a malicious HTTP...

curl: CURLOPT_COOKIE leaked to cross-origin redirect target — CURLOPT_UNRESTRICTED_AUTH bypass for the STRING_COOKIE path

Summary: httpcookies at lib/http.c:2532-2534 appends the value of CURLOPTCOOKIE the cookie supplied via -b to outgoing Cookie: headers without invoking Curlauthallowedtohost. As a result, when CURLOPTFOLLOWLOCATION is enabled and the initial origin issues a cross-origin redirect open redirector,...

PT-2026-44496

Music Player Daemon MPD before version 0.24.11 contains a server-side request forgery vulnerability in CurlInputPlugin where CURLOPT FOLLOWLOCATION is set without CURLOPT REDIR PROTOCOLS STR, allowing unauthenticated attackers to bypass the http/https scheme restriction by causing a malicious HTT...

OESA-2026-2451 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 vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If...

OESA-2026-2452 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 vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If...

OESA-2026-2454 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 vulnerability exists where a connection requiring TLS incorrectly reuses an existing unencrypted connection from the same connection pool. If...

curl: CVE-2026-9546: sending old referer

Summary: libcurl documents that CURLOPTREFERER can be set to NULL to disable the Referer header again, but doing so after a transfer does not clear the cached per-handle referer state. As a result, the next HTTP request on the same easy handle can still send the previous request's Referer: value ...

CLSA-2026-1779358008 Fix CVE(s): CVE-2026-5773

SECURITY UPDATE: libcurl may reuse the wrong connection for SMBS transfers, leading to access of an unintended SMB share with the same credentials. - debian/patches/CVE-2026-5773.patch: disable connection reuse for SMBS in lib/url.c by returning early from ConnectionExists when the requested...

CLSA-2026-1779357791 Fix CVE(s): CVE-2026-5773

SECURITY UPDATE: libcurl may reuse the wrong connection for SMBS transfers, leading to access of an unintended SMB share with the same credentials. - debian/patches/CVE-2026-5773.patch: disable connection reuse for SMBS in lib/url.c by returning early from ConnectionExists when the requested...

curl: CVE-2026-9079: stale proxy password leak

Product Product name: curl / libcurl Product link: https://github.com/curl/curl Suggested CWE: CWE-226: Sensitive Information in Resource Not Removed Before Reuse https://cwe.mitre.org/data/definitions/226.html; alternative CWE-200: Exposure of Sensitive Information to an Unauthorized Actor...

CVE-2026-7168

A flaw was found in libcurl. When a user performs a transfer over an HTTP proxy using Digest authentication and then reuses the same handle for a second transfer with a different proxy host, libcurl incorrectly sends the Proxy-Authorization header intended for the first proxy to the second proxy...

PT-2026-51739

Name of the Vulnerable Software and Affected Versions libcurl affected versions not specified Description A use-after-free issue exists in libcurl involving the HTTP/2 stream-dependency tree management. This occurs when an application configures the tree using CURLOPT STREAM DEPENDS or CURLOPT...

curl: CVE-2026-9080: UAF after pause in socket callback

Hi all, We've found a heap-use-after-free in lib/multiev.c triggered by calling curleasypause from within a CURLMOPTSOCKETFUNCTION callback. ASAN-confirmed with the self-contained reproducer below. Affected versions: 8.13.0 – 8.20.0 current. The entry-action write line 280 has been vulnerable sin...

curl: libcurl: Information disclosure via incorrect Proxy-Authorization header reuse

A flaw was found in libcurl. When a user performs a transfer over an HTTP proxy using Digest authentication and then reuses the same handle for a second transfer with a different proxy host, libcurl incorrectly sends the Proxy-Authorization header intended for the first proxy to the second proxy...