Bug#1142843: libsoup3: CVE-2026-15714

[Salvatore Bonaccorso]

Source: libsoup3
Version: 3.6.6-1
Severity: important
Tags: security upstream
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-15714[0]:
| An out-of-bounds read vulnerability was found in libsoup's multipart
| processing subsystem. The flaw exists in the
| soup_multipart_input_stream_read_headers() function inside soup-
| multipart-input-stream.c, which does not adequately restrict or
| validate the size of incoming multipart boundary strings. When
| processing a crafted HTTP response containing a malformed or
| oversized boundary parameter, the internal stream reader reads past
| the allocated buffer bounds. A remote, unauthenticated attacker can
| exploit this behavior to cause a service denial (DoS) through
| application failure or potentially read fragments of unauthorized
| memory metadata.


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-2026-15714
    https://www.cve.org/CVERecord?id=CVE-2026-15714
[1] https://gitlab.gnome.org/GNOME/libsoup/-/work_items/542

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore