JLSEC-2026-1201 Successfully using libcurl to do a transfer to a specific HTTP origin (`hostA`) with **Digest**...

Successfully using libcurl to do a transfer to a specific HTTP origin hostA with Digest authentication and then changing the origin to a different one hostB for a second transfer, reusing the same handle, makes libcurl wrongly pass on the Authorization: header field meant for hostA, to hostB...

JLSEC-2026-1205 libcurl might in some circumstances reuse the wrong connection for SMB(S) transfers. libcurl...

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...

JLSEC-2026-1207 Using libcurl, when a custom `Host:` header is first set for an HTTP request and a second request...

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...

JLSEC-2026-1216 When reusing a libcurl handle for sequential transfers driven by environment-variable proxy...

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...

JLSEC-2026-1210 Successfully using libcurl to do a transfer over a specific HTTP proxy (`proxyA`) with **Digest**...

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-2026-8458

A flaw was found in libcurl. A logical error in the connection pooling mechanism may cause libcurl to reuse an authenticated connection for an unintended service. This could allow an application to wrongfully reuse an existing connection to the same server that was authenticated for a different...

CVE-2026-69246

CVE-2026-69246 affects the PHP HTTP client Guzzle. Before versions 7.15.2 and 8.0.1, Guzzle passes the request URI to the transport as text and separately provides a Host header. The cURL handlers set CURLOPT_URL to the URI as written and push the Host into CURLOPT_HTTPHEADER; StreamHandler does ...

libcurl: libcurl: Information disclosure via cached SSL session and early data

A flaw was found in libcurl. An attacker can exploit this by replacing a legitimate HTTP/3 server with an impostor machine. When libcurl attempts a second transfer to the same site with a cached SSL session and early data enabled, it may send sensitive request data before verifying the server's...

EulerOS Virtualization 2.12.1 (EulerOS-SA-2026-2723)

According to the versions of the packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : 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...

OESA-2026-2986 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 use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPTSTREAMDEPENDS or...

OESA-2026-2987 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 use-after-free vulnerability exists in libcurl when an application configures an HTTP/2 stream-dependency tree via CURLOPTSTREAMDEPENDS or...

libcurl: libcurl: Information disclosure via cached SSL session and early data

A flaw was found in libcurl. An attacker can exploit this by replacing a legitimate HTTP/3 server with an impostor machine. When libcurl attempts a second transfer to the same site with a cached SSL session and early data enabled, it may send sensitive request data before verifying the server's...

libcurl: libcurl: Use-after-free vulnerability leading to Denial of Service

A flaw was found in libcurl. This use-after-free vulnerability occurs when an application configures an HTTP/2 stream-dependency tree and then performs a sequence of operations involving curleasyreset and curleasycleanup. During the final cleanup, libcurl attempts to access memory that has alread...

The vulnerability of the libcurl library in software applications for interacting with servers via cURL allows a hacker to gain unauthorized access to protected information.

The vulnerability of the libcurl library in software applications for interacting with servers via cURL is related to the use of files and directories accessible from external parties. Exploiting this vulnerability can allow an attacker operating remotely to gain unauthorized access to protected...

The vulnerability of the libcurl library in software applications for interacting with servers via cURL allows a hacker to gain unauthorized access to protected information.

The vulnerability of the libcurl library in software applications for interacting with servers via cURL is related to the possibility of bypassing the authentication process. Exploiting this vulnerability can allow an attacker operating remotely to gain unauthorized access to protected informatio...

The vulnerability of the libcurl library in software tools for interacting with servers via cURL allows a hacker to perform an SSRF attack.

The vulnerability of the libcurl library in software applications for interacting with servers via cURL is related to insufficient validation of requests at the server side. Exploiting this vulnerability allows a remote attacker to execute a SSRF attack...

The vulnerability of the libcurl library in software applications for interacting with servers via cURL allows a hacker to gain unauthorized access to protected information.

The vulnerability of the libcurl library in software applications for interacting with servers via cURL is related to the transmission of data in an open manner. Exploiting this vulnerability can allow a remote attacker to gain unauthorized access to protected information...

CrashStealer macOS Malware Uses Notarized Dropper to Pass Gatekeeper Checks

Cybersecurity researchers have flagged a new macOS information stealer called CrashStealer that's capable of harvesting sensitive data from compromised systems. Unlike other information stealers that are built on AppleScript droppers or Objective-C-based wrappers, CrashStealer is implemented in...

PYSEC-2026-2431 curl_cffi: Redirect-based SSRF leads to internal network access in curl_cffi (with TLS impersonation bypass)

Summary curlcffi does not restrict requests to internal IP ranges, and follows redirects automatically via the underlying libcurl. Because of this, an attacker-controlled URL can redirect requests to internal services such as cloud metadata endpoints. In addition, curlcffi’s TLS impersonation...

SUSE 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...