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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libsoup3: CVE-2026-66337
Message-ID: <178509657094.125464.14364302065021424806.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Sun, 26 Jul 2026 22:09:30 +0200
Delivered-To: submit@bugs.debian.org

Source: libsoup3
Version: 3.6.6-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libsoup/-/work_items/532
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-66337[0]:
| A flaw was found in libsoup. An unsigned integer underflow in the
| soup_filter_input_stream_read_until() function causes a heap buffer
| over-read when parsing multipart HTTP responses. A malicious HTTP
| server can exploit this by sending a crafted multipart response,
| potentially causing the client application to crash or disclose
| sensitive heap memory.


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-2026-66337
    https://www.cve.org/CVERecord?id=CVE-2026-66337
[1] https://gitlab.gnome.org/GNOME/libsoup/-/work_items/532

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]