CVE-2026-86414

Public on 2026-10-19

Modified on 2026-10-19

Description

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:.

Severity

Medium

See what this means

CVSS v3 Base Score

6.5

See breakdown

Affected Packages

Platform	Package	Status
Amazon Linux 2 - Core	curl	Pending Fix
Amazon Linux 2023	curl	Pending Fix
Amazon Linux 2027 Preview	curl	Pending Fix

CVSS Scores

	Score Type	Score	Vector
Amazon Linux	CVSSv3	6.5	CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

References

FAQs regarding Amazon Linux ALAS/CVE Severity Red Hat: CVE-2026-86414 Mitre: CVE-2026-86414