Bug#1126628: libsoup3: CVE-2026-1539

[Salvatore Bonaccorso]

Source: libsoup3
Version: 3.6.5-3
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libsoup/-/issues/489
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-1539[0]:
| A flaw was found in the libsoup HTTP library that can cause proxy
| authentication credentials to be sent to unintended destinations.
| When handling HTTP redirects, libsoup removes the Authorization
| header but does not remove the Proxy-Authorization header if the
| request is redirected to a different host. As a result, sensitive
| proxy credentials may be leaked to third-party servers. Applications
| using libsoup for HTTP communication may unintentionally expose
| proxy authentication data.


If you fix the vulnerability please also make sure to include the
CVE (Common Vulnerabilities & Exposures) id in your changelog entry.

For further information see:

[0] https://security-tracker.debian.org/tracker/CVE-2026-1539
    https://www.cve.org/CVERecord?id=CVE-2026-1539
[1] https://gitlab.gnome.org/GNOME/libsoup/-/issues/489
[2] https://gitlab.gnome.org/GNOME/libsoup/-/commit/98c1285d9d78662c38bf14b4a128af01ccfdb446

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore