Vulnerabilities CVE-2026-66339

CVE-2026-66339

Medium

Open

TLP:CLEAR

Libsoup: libsoup: proxy credentials leak to destination server via proxy-authorization header in connect tunnels

NVD CVE.org

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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.

Details

CVSS Score: 6.5
EPSS Score ⓘ: 0.23%

13.8th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N
Confidence: 90%
Published: Jul 24, 2026
Last Modified: Jul 24, 2026

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