CVE-2026-19538

The BLOCKED access control list items that are evaluated to deny access on the the proxy protocol port can be bypassed completely when connecting over TCP or TLS and sending the query twice on connection that is kept open...

curl: CVE-2026-80231: native CA store conn reuse

Summary nativecastore is in struct sslconfigdata line 73 of vtlsconfig.h, not sslprimaryconfig. matchsslprimaryconfig does not compare it. On macOS, Curlssleasyconfigcomplete line 258 auto-sets nativecastore = TRUE when no custom CA is configured — without modifying ssloptions. When CURLCABUNDLE ...

curl: OpenSSL ENGINE selection omitted from mTLS connection matching

Summary When an application sets CURLOPTSSLENGINE to select an OpenSSL ENGINE for resolving ENG-type client certificate and private key identifiers, the engine selection is not included in the TLS configuration compared during connection reuse. A second easy handle with a different engine but the...

USN-8670-2: curl vulnerability

USN-8670-1 fixed a vulnerability in curl. This update provides the corresponding update for Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. Original advisory details: Joshua Rogers discovered that curl incorrectly handled reusing connections when client certificate settings changed. Thi...

USN-8670-2 curl vulnerability

USN-8670-1 fixed a vulnerability in curl. This update provides the corresponding update for Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. Original advisory details: Joshua Rogers discovered that curl incorrectly handled reusing connections when client certificate settings changed. Thi...

Security update for curl

This update for curl fixes the following issues: CVE-2026-5545: wrong reuse of HTTP Negotiate connection bsc1262632. CVE-2026-5773: wrong reuse of SMB connection bsc1262633. CVE-2026-6253: proxy credentials leak over redirect-to proxy bsc1262635. CVE-2026-6276: stale custom cookie host causes...

SUSE-SU-2026:3798-1 Security update for curl

This update for curl fixes the following issues: - CVE-2026-5545: wrong reuse of HTTP Negotiate connection bsc1262632. - CVE-2026-5773: wrong reuse of SMB connection bsc1262633. - CVE-2026-6253: proxy credentials leak over redirect-to proxy bsc1262635. - CVE-2026-6276: stale custom cookie host...

EulerOS Virtualization 2.13.0 : curl (EulerOS-SA-2026-3209)

According to the versions of the curl packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a...

EulerOS Virtualization 2.13.1 : curl (EulerOS-SA-2026-3169)

According to the versions of the curl packages installed, the EulerOS Virtualization installation on the remote host is affected by the following vulnerabilities : libcurl might in some circumstances reuse the wrong connection when asked to do an authenticated HTTPS request after a...

PT-2026-82042

USN-8670-1 fixed a vulnerability in curl. This update provides the corresponding update for Ubuntu 18.04 LTS, Ubuntu 20.04 LTS, and Ubuntu 22.04 LTS. Original advisory details: Joshua Rogers discovered that curl incorrectly handled reusing connections when client certificate settings changed. Thi...

USN-8670-1 curl vulnerability

Joshua Rogers discovered that curl incorrectly handled reusing connections when client certificate settings changed. This could result in the wrong client certificates being used, contrary to expectations...

USN-8670-1: curl vulnerability

Joshua Rogers discovered that curl incorrectly handled reusing connections when client certificate settings changed. This could result in the wrong client certificates being used, contrary to expectations...

Tenable Security Center < 6.9.0 Multiple Vulnerabilities (TNS-2026-22)

According to its self-reported version, the Tenable Security Center running on the remote host is prior to 6.9.0. It is, therefore, affected by multiple vulnerabilities as referenced in the TNS-2026-22 advisory. - libcurl might in some circumstances reuse the wrong connection for SMBS transfers...

Oracle Linux 8 : curl (ELSA-2026-57462)

The remote Oracle Linux 8 host has packages installed that are affected by a vulnerability as referenced in the ELSA-2026-57462 advisory. - fix TLS/STARTTLS connection reuse vulnerability CVE-2026-8286 Tenable has extracted the preceding description block directly from the Oracle Linux security...

curl: curl: Insecure connection establishment due to TLS configuration mismatch

A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security TLS configuration of the new transfer does not match the existing connection,...

curl security, bug fix, and enhancement update

7.61.1-34.el810.13 - fix TLS/STARTTLS connection reuse vulnerability CVE-2026-8286 7.61.1-34.el810.12 - NTLM: use HTTP/1.0 instead of HTTP/1.1 for compatibility RHEL-171912...

USN-8651-1: curl vulnerability

It was discovered that curl incorrectly handled reusing connections when the origin changed between transfers. A remote attacker could possibly use this issue to obtain sensitive information...

USN-8651-1 curl vulnerability

It was discovered that curl incorrectly handled reusing connections when the origin changed between transfers. A remote attacker could possibly use this issue to obtain sensitive information...

curl: curl: Insecure connection establishment due to TLS configuration mismatch

A flaw was found in curl. When a new data transfer attempts to upgrade its connection using STARTTLS, it may incorrectly reuse an existing live connection. This reuse can occur even if the Transport Layer Security TLS configuration of the new transfer does not match the existing connection,...

curl: curl: Authentication bypass due to incorrect connection reuse with Negotiate authentication

A flaw was found in curl. When an application uses libcurl to make multiple Negotiate-authenticated HTTP or HTTPS requests to the same server with different credentials, libcurl may incorrectly reuse an existing connection. This logical error can cause a subsequent request to be sent using the...