Bug#1142842: libsoup3: CVE-2026-15713

[Salvatore Bonaccorso]

Source: libsoup3
Version: 3.6.6-1
Severity: important
Tags: security upstream
Forwarded: https://gitlab.gnome.org/GNOME/libsoup/-/work_items/541
X-Debbugs-Cc: carnil at debian.org, Debian Security Team <team at security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-15713[0]:
| A vulnerability was found in libsoup's HTTP/2 protocol
| implementation. The library fails to correctly release memory
| context blocks under specific stream termination conditions, such as
| when an HTTP/2 connection encounters window exhaustion or explicit
| stream resets. A remote, unauthenticated attacker acting as a
| malicious network peer can trick the connection engine into
| allocating stream states that are subsequently leaked during
| cleanup. Over a sustained period, this flaw allows the remote
| attacker to consume the system's heap allocations incrementally,
| triggering a denial of service (DoS) through an ultimate Out-of-
| Memory (OOM) application crash.


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-2026-15713
    https://www.cve.org/CVERecord?id=CVE-2026-15713
[1] https://gitlab.gnome.org/GNOME/libsoup/-/work_items/541

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore