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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libsoup3: CVE-2026-15712
Message-ID: <178509641377.124508.10401060775094227652.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Sun, 26 Jul 2026 22:06:53 +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/540
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-15712[0]:
| A heap buffer over-read vulnerability was discovered in libsoup's
| (versions: libsoup 3.0 to 3.7.0) HTTP/2 connection tracking
| framework. When the library processes an HTTP/2 GOAWAY frame, it
| improperly handles the "Additional Debug Data" payload by assuming
| the data stream is a safely NUL-terminated C-string. Because the
| parser lacks strict length-boundary verification before reading this
| data, a remote, unauthenticated attacker can intentionally send a
| malformed GOAWAY frame missing the appropriate null delimiter. This
| causes the library to read past the end of the allocated buffer,
| triggering an application crash that results in a denial of service
| (DoS), or potentially exposing fragments of memory contents.


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-2026-15712
    https://www.cve.org/CVERecord?id=CVE-2026-15712
[1] https://gitlab.gnome.org/GNOME/libsoup/-/work_items/540

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]