CVE-2026-19931

Critical · CVSS 9.8

CVSS: 9.8; nvd
EPSS: —
KEV: No
Class: oss containerizable; CWE-488, CWE-488

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.

References

https://curl.se/docs/CVE-2026-19931.html
https://curl.se/docs/CVE-2026-19931.json
https://hackerone.com/reports/3923520
https://hackerone.com/reports/3923520

Status: profiled · ingested 2026-09-12T00:00:14.000Z