CVE-2026-66339

MediumCVSS 6.5/10Last modified Aug 24, 2026

Description

A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly attaches the Proxy-Authorization header to subsequent HTTPS requests sent through that tunnel to the destination server. This allows the destination server to capture proxy credentials, leading to information disclosure.

Metrics

CVSS 3.1 6.5/10CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

Weakness enumeration

CWE-201

Affected software

No affected versions have been published.

Timeline

Published: Jul 24, 2026
Last modified: Aug 24, 2026
NVD status: Analyzed

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