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

CVE-2026-11856

CriticalNo 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

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`.

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-2026-11856 scored CVSS 9.8

    Basis: NIST National Vulnerability Database

  2. Patch releasedUpdate

    Patch released for CVE-2026-11856

    An official fix is now available.

    Basis: NVD patch reference

Coverage

References