VULNERABILITY INTELLIGENCE

CVE-2026-19931

CVSS score9.8 CRITICAL
EPSS probability1.13%
CISA KEVNot currently listed
Published2026-09-06
Last modified2026-09-15
CVSS vectorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Description

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.

Weakness classification

  • 2499f714-1537-4658-8207-48ae4bb9eae9: CWE-488
  • 134c704f-9b21-4f2e-91b3-4a467353bcc0: CWE-488

Primary references