Intelligence online17 sources monitored15 actively exploited 7d41 published 24hChecked recently
Vulnerability record

CVE-2026-6276

HighNo known exploitation

Patch status

Official fix available since

Apply the vendor's update to every affected system. Check the fixed-in versions below where known.

Basis: NVD patch reference

Description

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 request. Leak them.

Source: NIST National Vulnerability Database. Official vulnerability data, reproduced as published.

Intelligence timeline

Developments from the last 30 days, newest first.

  1. CVSS scoredUpdate

    CVE-2026-6276 scored CVSS 7.5

    Basis: NIST National Vulnerability Database

  2. Patch releasedUpdate

    Patch released for CVE-2026-6276

    An official fix is now available.

    Basis: NVD patch reference

Coverage

References