curl: Connection reuse ignores haproxyprotocol and HAPROXY_CLIENT_IP settings, allowing PROXY context to persist across transfers

Summary: libcurl's connection pool match logic does not include the CURLOPTHAPROXYPROTOCOL setting or the CURLOPTHAPROXYCLIENTIP value in its connection match key. Two transfers issued through the same Curleasy or via a shared connection cache CURLLOCKDATACONNECT therefore share one TCP connectio...

curl: SSL session-cache peer key omits signature_algorithms: strict-sigalg handle silently resumes a permissive sibling's session

CURLOPTSSLSIGNATUREALGORITHMS policy bypass: SSL session cache key omits sigalgs, allowing a strict-sigalg handle to resume a session negotiated under a permissive policy AI disclosure This report was prepared with the assistance of an AI coding assistant Claude. The behavioral diff pre/post patc...

CLSA-2026-1778890582 curl: Fix of CVE-2026-5545

CVE-2026-5545: wrong reuse of HTTP Negotiate connection; only allow an existing connection to be reused and "upgraded" to NTLM when neither NTLM nor Negotiate authentication is in flight on it...

CLSA-2026-1778889816 curl: Fix of CVE-2026-5545

CVE-2026-5545: wrong reuse of HTTP Negotiate connection; only allow an existing connection to be reused and "upgraded" to NTLM when neither NTLM nor Negotiate authentication is in flight on it...

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...

Moderate Photon OS Security Update - PHSA-2026-4.0-1020

Updates of 'curl' packages of Photon OS have been released...

Exploit for CVE-2025-9074

🐚 docker-shell A lightweight, dependency-free bash script tha...

SUSE CVE-2025-5265

Due to insufficient escaping of the ampersand character in the “Copy as cURL” feature, an attacker could trick a user into using this command, potentially leading to local code execution on the user's system. This bug only affects Firefox for Windows. Other versions of Firefox are unaffected.. Th...

Medium: curl

Issue Overview: 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 Affected Packages: curl Issue Correction: Run dnf update curl --releasever 2023.11.20260514 or dnf update --advisory ALAS2023-2026-1699...

Malicious code in ethers-signing-key (npm)

--- -= Per source details. Do not edit below this line.=- Source: amazon-inspector b6735be7311be4f6b4f609762cfb77504fe141bc9d8d5b5c0a75d521119aa2fa The package's npm postinstall hook executes a one-liner that uses childprocess.exec to curl/wget an unpinned Python script from a personal user's...

CLSA-2026-1778786567 curl: Fix of 2 CVEs

CVE-2018-1000120: fix buffer overflow exists in the FTP URL handling - CVE-2018-1000007: fix leak authentication data to third parties in HTTP requests...

curl: NULL pointer dereference in libcurl URL API redirect_url() with CURLU_DEFAULT_SCHEME

Summary A NULL pointer dereference appears to exist in libcurl's URL API path when curlurlset handles a relative URL together with CURLUDEFAULTSCHEME on a CURLU handle that has host/path information but no stored u-scheme. The issue is in lib/urlapi.c inside redirecturl, where u-scheme is used in...

[R2] Tenable Network Monitor 6.5.4 Fixes Multiple Vulnerabilities

R2 Tenable Network Monitor 6.5.4 Fixes Multiple Vulnerabilities Jason Schavel Thu, 05/14/2026 - 13:00 Tenable Network Monitor leverages third-party software to help provide underlying functionality. Several of the third-party components OpenSSL, curl, sqlite3, handlebars, expat, and dpdk were fou...

EUVD-2026-29930

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...

curl: TLS peer-verification bypass via mid-transfer ssl_config mutation

Hi all, We want to report a TLS peer-verification issue on current master. The trigger is narrow and requires a specific application usage pattern, but when it fires, a transfer that requests CURLOPTSSLVERIFYPEER=1 can reuse a TLS connection that was established with peer verification disabled...

Fedora 42 : php (2026-3a58db70ca)

The remote Fedora 42 host has a package installed that is affected by multiple vulnerabilities as referenced in the FEDORA-2026-3a58db70ca advisory. PHP version 8.4.21 07 May 2026 Core: Fixed bug GH-19983 GC assertion failure with fibers, generators and destructors. iliaal Fixed bug GH-21478...

curl: TLS verifyhost bypass in rustls, mbedTLS, and wolfSSL when verifypeer=0

The now-well-known CURLOPTSSLVERIFYHOST-bypass-when-CURLOPTSSLVERIFYPEER=0 defect exists in three of curl's TLS backends: rustls EXPERIMENTAL, mbedTLS, and wolfSSL DNS hostnames only. The documented contract at docs/libcurl/opts/CURLOPTSSLVERIFYPEER.md:57-59: The check that the host name in the...

curl: HTTP/2 proxy CONNECT tunnel unbounded 1xx chain (missing Curl_bump_headersize cap in cf-h2-proxy.c)

A malicious HTTPS-on-HTTP/2 proxy can grow a libcurl client's resident set without bound during the CONNECT phase by streaming 1xx informational responses. The CVE-2023-38039 cap MAXHTTPRESPHEADERSIZE, 300 KiB, enforced through Curlbumpheadersize is not applied on the HTTP/2 proxy path. The HTTP/...

curl: Credentials forwarded to HTTP after HTTPS→HTTP same-port redirect — url_set_data_creds uses scheme-blind comparator

Hi all, The recent creds: hold credentials refactor — commit 8f71d0fde5 2026-05-11 https://github.com/curl/curl/commit/8f71d0fde5 — introduced a credential-leak regression on HTTPS→HTTP same-port redirects. -u user:pass and --oauth2-bearer both end up in cleartext after a 302 from https://h:N/ to...

curl: CURLOPT_HSTS_CTRL disables shared HSTS without share guard — use-after-free and double-free

Hi all, CURLOPTHSTSCTRL set to a value without CURLHSTSENABLE unconditionally frees the easy's HSTS object — even when that object is shared via a CURLSH. The result is a use-after-free and a double-free on the shared 48-byte struct hsts block when the share or any other linked easy is later torn...