146 matches found
curl: Negotiate Authentication Premature on Connection Reuse
Summary: Curl 8.19.0+ inappropriately sends Negotiate authentication headers on reused keep-alive connections where authentication was already completed. Commit ab650379a8 June 2025 moved negotiate auth context to on-demand metadata storage, but during connection reuse the metadata gets cleared...
curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication
A flaw was found in curl. When an application uses libcurl to make multiple Negotiate-authenticated HTTP or HTTPS requests to the same server with different credentials, libcurl may incorrectly reuse an existing connection. This logical error can cause a subsequent request to be sent using the...
curl: Negotiate connection reuse with wrong credentials when using CURLAUTH_ANY
Summary: CVE-2026-1965 fixed connection reuse for Negotiate authentication by adding urlmatchauthnego in urlmatchconn at line 1244 of lib/url.c. When a first handle authenticates via Negotiate Kerberos on a connection and that connection returns to the pool, a second handle with different...
curl: CVE-2026-5545: wrong reuse of HTTP Negotiate connection
Summary: An attacker sharing a libcurl multi-handle connection pool can hijack another user's Negotiate/Kerberos-authenticated connection. When User A authenticates via Negotiate SPNEGO and the connection returns to the pool, User B using CURLAUTHANY with different credentials gets that connectio...
OESA-2026-1704 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: libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. libcurl feature...
Ubuntu: Security Advisory (USN-8099-1)
The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...
Ubuntu 18.04 LTS / 20.04 LTS : curl vulnerabilities (USN-8099-1)
The remote Ubuntu 18.04 LTS / 20.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8099-1 advisory. Zhicheng Chen discovered that curl could incorrectly reuse the wrong connection for Negotiate- authenticated HTTP or HTTPS requests. This cou...
USN-8099-1: curl vulnerabilities
Zhicheng Chen discovered that curl could incorrectly reuse the wrong connection for Negotiate-authenticated HTTP or HTTPS requests. This could result in the use of credentials from a different connection, contrary to expectations. This issue only affected Ubuntu 20.04 LTS. CVE-2026-1965 It was...
Ubuntu: Security Advisory (USN-8084-1)
The remote host is missing an update for the SPDX-FileCopyrightText: 2026 Greenbone AG Some text descriptions might be excerpted from a referenced sources, and are Copyright C by the respective right holders. SPDX-License-Identifier: GPL-2.0-only ifdescription...
bad reuse of HTTP Negotiate connection
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CVE-2026-1965
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
UBUNTU-CVE-2026-1965
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
SUSE CVE-2026-1965
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
EUVD-2026-11135
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
DEBIAN-CVE-2026-1965
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
ALPINE-CVE-2026-1965
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
CVE-2026-1965
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
AZL-79676 CVE-2026-1965 affecting package curl for versions less than 8.11.1-6
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
CVE-2026-1965 bad reuse of HTTP Negotiate connection
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...
CVE-2026-1965
libcurl can in some circumstances reuse the wrong connection when asked to do an Negotiate-authenticated HTTP or HTTPS request. 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...