Bug#1142844: libsoup3: CVE-2026-66337

[Salvatore Bonaccorso]

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 at debian.org, Debian Security Team <team at 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