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...

Astra Linux – Vulnerability in curl

There is an authentication bypass vulnerability in libcurl version 8.0.0, particularly in the FTP connection reuse feature. This vulnerability can cause incorrect credentials to be used during subsequent transfers. Previously created connections are retained in a connection pool for reuse if they...

Astra Linux – Vulnerability in curl

libcurl provides the CURLOPTCERTINFO option to allow applications to request details about a server’s certificate chain. Due to a faulty function, a malicious server could cause libcurl, built with NSS, to get stuck in an endless busy-loop when attempting to retrieve that information...

Astra Linux – Vulnerability in curl

When performing HTTPS transfers, libcurl may incorrectly use the read callback CURLOPTREADFUNCTION to request data to be sent, even when the CURLOPTPOSTFIELDS option has been set. This occurs if the same handle was previously used to issue a PUT request that utilized that callback. This flaw may...

Astra Linux – Vulnerability in curl

A authentication bypass vulnerability exists in libcurl prior to v8.0.0. It reuses an previously established SSH connection, even though one SSH option has been modified, which should prevent such reuse. libcurl maintains a pool of previously used connections and can reuse them for subsequent...

Astra Linux – Vulnerability in curl

libcurl will reuse a previously established connection even when options related to TLS or SSH have been changed, which should prevent such reuses. libcurl stores previously used connections in a connection pool, allowing for reuse if one of them matches the current setup. However, several TLS an...

Astra Linux – Vulnerability in curl

Due to the use of a dangling pointer, libcurl versions 7.29.0 through 7.71.1 can use the wrong connection when sending data...

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...

curl: CVE-2026-8927: env-set cross-proxy Digest auth state leak

AI-assisted preparation note I used AI assistance to help structure and format this report, but the technical findings, PoC, and verification results are based on local testing against curl/libcurl 8.20.0. Summary I found a possible incomplete-fix variant of CVE-2026-7168 in libcurl 8.20.0. The...

Amazon Linux 2023 : curl, curl-minimal, libcurl (ALAS2023-2026-1699)

It is, therefore, affected by a vulnerability as referenced in the ALAS2023-2026-1699 advisory. When doing a second SMB request to the same host again, curl would wrongly use a data pointer pointing into already freed memory. CVE-2026-3805 Tenable has extracted the preceding description block...

EUVD-2026-29923

libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a Negotiate-authenticated one, when both use the same host. libcurl features a pool of recent connections so that subsequent requests can reuse an existing connection to avoid...

CVE-2026-7168

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-2026-6429

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...

ALPINE-CVE-2026-6276

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...

ALPINE-CVE-2026-6429

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...

CVE-2026-6276

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...

ALPINE-CVE-2026-5773

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...