Bug#1138213: libsoup3: CVE-2026-6324

[Salvatore Bonaccorso]

Source: libsoup3
Version: 3.6.6-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libsoup/-/issues/508
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-6324[0]:
| A flaw was found in libsoup. A remote attacker could exploit an
| unsigned to signed conversion error in the
| `soup_body_input_stream_read_chunked()` function by sending a
| malicious HTTP request. This vulnerability occurs when libsoup
| operates behind a non-libsoup proxy server or as a proxy in front of
| a non-libsoup backend server. Successful exploitation can allow an
| attacker to bypass security controls, poison web caches, or gain
| unauthorized access.


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-2026-6324
    https://www.cve.org/CVERecord?id=CVE-2026-6324
[1] https://gitlab.gnome.org/GNOME/libsoup/-/issues/508
[2] https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/517
[3] https://gitlab.gnome.org/GNOME/libsoup/-/commit/96ac392b444d01bd5de1d1276b187c3ed49d048c

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore