This page tracks the Debian fix status. The vulnerability itself is described on the main CVE page.
View CVE-2026-66339 →
DEBIAN-CVE-2026-66339
A flaw was found in libsoup. After a CONNECT tunnel is established through an HTTP proxy, libsoup incorrectly attaches the Proxy-Authorization header...
Original description
The description as published by the source.
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.
Source: OSV.dev (Open Source Vulnerabilities) OSV
Affected packages
Debian:12
libsoup2.4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:13
libsoup2.4
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:12
libsoup3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:13
libsoup3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
Debian:14
libsoup3
[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}]
References
- advisory security-tracker.debian.org