CVE-2026-66339 – Libsoup: libsoup: proxy credentials leak to destination server via proxy-authorization header in connect tunnels

CVE ID :CVE-2026-66339

Published : July 24, 2026, 11:16 p.m. | 34 minutes ago

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.

Severity: 6.5 | MEDIUM

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