libcurl 8.18.0 < 8.21.0 Persistent Referer Header Information Disclosure

The version of libcurl installed on the remote host is 8.18.0 prior to 8.21.0. It is, therefore, affected by an information disclosure vulnerability: - A vulnerability in libcurl caused the HTTP Referer header to persist even when explicitly cleared, potentially leaking sensitive information to...

libcurl 8.13.0 < 8.21.0 Use-After-Free in Socket Callback

The version of libcurl installed on the remote host is 8.13.0 prior to 8.21.0. It is, therefore, affected by a use-after-free vulnerability: - Calling curleasypause within the event-based CURLMOPTSOCKETFUNCTION callback triggers a use-after-free vulnerability. CVE-2026-9080 Note that Nessus has n...

libcurl 8.17.0 < 8.21.0 Native CA Trust Persist

The version of libcurl installed on the remote host is 8.17.0 prior to 8.21.0. It is, therefore, affected by an improper certificate validation vulnerability: - An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches th...

libcurl 7.10.6 < 8.21.0 Cross-Origin Digest Auth State Leak

The version of libcurl installed on the remote host is 7.10.6 prior to 8.21.0. It is, therefore, affected by a credential disclosure vulnerability: - Successfully using libcurl with Digest authentication and then changing the origin to a different host for a second transfer, reusing the same...

libcurl 8.8.0 < 8.21.0 Stale Proxy Password Leak

The version of libcurl installed on the remote host is 8.8.0 prior to 8.21.0. It is, therefore, affected by a credential disclosure vulnerability: - libcurl had a flaw that when instructed to clear proxy authentication credentials, it did not do so, leaving the old credentials around to get used...

libcurl 7.12.0 < 8.21.0 Cross-Proxy Digest Auth State Leak

The version of libcurl installed on the remote host is 7.12.0 prior to 8.21.0. It is, therefore, affected by a proxy credential disclosure vulnerability: - When reusing a libcurl handle for sequential transfers driven by environment-variable proxy configuration, libcurl fails to clear the proxy...

ThreatsDay Bulletin: Smart TV Proxyware, 24-Year curl Bug, AI Crime Forums + 13 More Stories

It’s dumb out there again. This week has the usual smell of prod on fire and nobody wanting to admit who left the door open — old creds still working, trusted apps doing sketchy crap, browser tricks jumping the fence, and “normal” workflows turning into phishing pipes because apparently email was...

The vulnerability of the UDP packet reception function in QUIC’s libcurl library, a software library for interacting with servers via cURL, allows a attacker to cause a service failure.

The vulnerability of the UDP packet reception function in the QUIC library of the cURL software for interacting with servers is related to the execution of a loop with an unavailable exit condition. Exploiting this vulnerability could allow a remote attacker to cause service failures...

The vulnerability of the dependency management mechanism for HTTP/2 protocols in the libcurl library of the software tool for interacting with servers via cURL allows a attacker to cause a service failure.

The vulnerability of the dependency management mechanism for HTTP/2, as well as the libcurl library used in the cURL client software for interacting with servers, relates to the possibility of exploiting memory after it is freed. Exploiting this vulnerability could allow a remote attacker to caus...

CVE-2026-8927

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...

UBUNTU-CVE-2026-9080

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-2026-9546

A vulnerability in libcurl caused the HTTP Referer: header to persist even when explicitly cleared. While the documentation states that passing NULL to CURLOPTREFERER suppresses the header, the option failed to clear the internal state. As a result, the previous referrer string was erroneously...

UBUNTU-CVE-2026-11564

libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA...

UBUNTU-CVE-2026-9546

A vulnerability in libcurl caused the HTTP Referer: header to persist even when explicitly cleared. While the documentation states that passing NULL to CURLOPTREFERER suppresses the header, the option failed to clear the internal state. As a result, the previous referrer string was erroneously...

CVE-2026-10536

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...

CVE-2026-11564

libcurl keeps previously used connections in a connection pool for subsequent transfers to reuse if one of them matches the setup. An easy handle that first uses default native CA trust can continue trusting the native platform store after the application switches that same handle to custom CA...

CVE-2026-8458

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...

UBUNTU-CVE-2026-9545

In this scenario, libcurl first uses a proper HTTP/3 server for the initial transfers, and when it makes a second transfer to the same site it has been replaced by the attacker's impostor machine - without a valid certificate. When libcurl returns to the hostname the second time with a cached SSL...

UBUNTU-CVE-2026-8927

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...

UBUNTU-CVE-2026-9547

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...