Bug#1142837: libsoup3: CVE-2026-12547

[Salvatore Bonaccorso]

Source: libsoup3
Version: 3.6.6-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libsoup/-/work_items/506
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-12547[0]:
| SoupAuthManager caches proxy authentication credentials without
| scoping them to the proxy authority (host:port). When the proxy
| configuration changes (e.g., via system settings or WPAD), cached
| Proxy-Authorization headers from the previous proxy are sent to the
| new proxy, leaking credentials.


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-2026-12547
    https://www.cve.org/CVERecord?id=CVE-2026-12547
[1] https://gitlab.gnome.org/GNOME/libsoup/-/work_items/506

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore