CVE-2026-18924

A flaw was found in libcurl. When libcurl handles HTTP/2 Server Push streams and the parent handle shares connections, a use-after-free vulnerability can occur during the cleanup process. This could lead to application crashes, resulting in a denial of service. Mitigation Disable HTTP/2 Server Pu...

CVE-2026-19931

A flaw was found in libcurl. This vulnerability allows an attacker to reuse an HTTP connection set up for a given hostname using Negotiate authentication. When an initial request is made with empty credentials, a subsequent user's request can be sent over a previously authenticated connection...

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 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

When performing SSH-based transfers using either SCP or SFTP, and setting the knownhosts file, libcurl may still mistakenly accept connections to hosts that are not present in the specified file, if those hosts are added as recognized in the libssh global knownhosts file...

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 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

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...

Medium: curl

Issue Overview: 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...

Unity Linux 20.1050e / 20.1060e / 20.1070e Security Update: curl (UTSA-2026-106769)

The Unity Linux 20 host has a package installed that is affected by a vulnerability as referenced in the UTSA-2026-106769 advisory. libcurl would reuse a previously created connection even when some mTLS config related option had been changed that should have prohibited reuse. libcurl keeps...

SUSE CVE-2026-18924

A flaw in libcurl's handling of HTTP/2 Server Push streams, when the parent handle is set to share connections with other handles, can lead to use-after-free in the cleanup process...

SUSE CVE-2026-19931

A flaw in libcurl makes it wrongly reuse an HTTP connection setup for a given hostname using Negotiate authentication, when the initial request is done using empty credentials. This can make user B's request get sent over user A's previously authenticated connection...

Use After Free

Overview Affected versions of this package are vulnerable to Use After Free in the cleanup process when handling HTTP/2 Server Push streams with the parenthandle configured to share connections with other handles. An attacker can execute arbitrary code or cause a denial of service by triggering...

Improper Authentication

Overview Affected versions of this package are vulnerable to Improper Authentication via the SASL negotiation process. An attacker can gain unauthorized access by injecting a premature or shortcut response during a Man-in-the-Middle MITM attack, causing incomplete peer validation to be...

Improper Authentication

Overview Affected versions of this package are vulnerable to Improper Authentication via the CURLOPTPINNEDPUBLICKEY option in combination with disabled peer verification settings. An attacker can establish unauthenticated connections by bypassing the expected public key pinning check when both...

Access Control Bypass

Overview Affected versions of this package are vulnerable to Access Control Bypass via the connection reuse process. An attacker can gain unauthorized access to another user's authenticated session by sending a request using empty credentials, which may be routed over a previously authenticated...

Access Control Bypass

Overview Affected versions of this package are vulnerable to Access Control Bypass via improper handling of the Set-Cookie header when the Domain attribute matches a public suffix. An attacker can cause cookies to be sent to arbitrary sibling subdomains by setting a cookie with a domain scope tha...

Authentication Bypass by Primary Weakness

Overview Affected versions of this package are vulnerable to Authentication Bypass by Primary Weakness in the connection reuse process when a different Native CA Store setting is used than the one originally configured. An attacker can compromise the integrity of HTTPS connections by exploiting t...

Improper Certificate Validation

Overview Affected versions of this package are vulnerable to Improper Certificate Validation in the CURLOPTSSLCTXFUNCTION callback process when CA caching is enabled with the wolfSSL backend. An attacker can bypass intended trust store restrictions by presenting a certificate that is trusted by t...