Bug#1122667: libsoup3: CVE-2025-14523

[Salvatore Bonaccorso]

Source: libsoup3
Version: 3.6.5-5
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libsoup/-/issues/472
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2025-14523[0]:
| A flaw in libsoup’s HTTP header handling allows multiple Host:
| headers in a request and returns the last occurrence for server-side
| processing. Common front proxies often honor the first Host: header,
| so this mismatch can cause vhost confusion where a proxy routes a
| request to one backend but the backend interprets it as destined for
| another host. This discrepancy enables request-smuggling style
| attacks, cache poisoning, or bypassing host-based access controls
| when an attacker supplies duplicate Host headers.


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-2025-14523
    https://www.cve.org/CVERecord?id=CVE-2025-14523
[1] https://gitlab.gnome.org/GNOME/libsoup/-/issues/472

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore