CVE-2026-86414 Affecting curl package, versions <8.23.0~rc1-1


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.29% (21st percentile)

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  • Snyk IDSNYK-DEBIANUNSTABLE-CURL-20936789
  • published14 Oct 2026
  • disclosed20 Oct 2026

Introduced: 14 Oct 2026

NewCVE-2026-86414  (opens in a new tab)

How to fix?

Upgrade Debian:unstable curl to version 8.23.0~rc1-1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream curl package and not the curl package as distributed by Debian. See How to fix? for Debian:unstable relevant fixed versions and status.

An HTTP proxy can trick libcurl into sending the origin's credentials (Basic password, or a Negotiate/Kerberos ticket) to the proxy itself, by answering the CONNECT tunnel request with 401 WWW-Authenticate: instead of the expected 407 Proxy-Authenticate:.

CVSS Base Scores

version 3.1