Bug#1131447: libsoup3: CVE-2026-4271

[Salvatore Bonaccorso]

Source: libsoup3
Version: 3.6.6-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libsoup/-/issues/496
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-4271[0]:
| A flaw was found in libsoup, a library for handling HTTP requests.
| This vulnerability, known as a Use-After-Free, occurs in the HTTP/2
| server implementation. A remote attacker can exploit this by sending
| specially crafted HTTP/2 requests that cause authentication
| failures. This can lead to the application attempting to access
| memory that has already been freed, potentially causing application
| instability or crashes, resulting in a Denial of Service (DoS).


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-2026-4271
    https://www.cve.org/CVERecord?id=CVE-2026-4271
[1] https://gitlab.gnome.org/GNOME/libsoup/-/issues/496

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore