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From: Salvatore Bonaccorso <carnil@debian.org>
To: Debian Bug Tracking System <submit@bugs.debian.org>
Subject: libsoup3: CVE-2026-15709
Message-ID: <178509630578.124221.501529542197680080.reportbug@eldamar.lan>
X-Mailer: reportbug 13.2.0+nmu1
Date: Sun, 26 Jul 2026 22:05:05 +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/-/issues/511
X-Debbugs-Cc: carnil@debian.org, Debian Security Team <team@security.debian.org>

Hi,

The following vulnerability was published for libsoup3.

CVE-2026-15709[0]:
| A flaw was found in libsoup's WebSocket implementation when using
| the permessage-deflate extension. The extension's decompression loop
| (inflate()) processes data in chunks without enforcing an upper
| boundary limit on the output buffer size. While libsoup limits the
| incoming compressed frame size via max_incoming_payload_size, it
| fails to track or limit memory allocation during decompression. A
| separate check for decompressed size (max_total_message_size) exists
| but executes only after inflation is complete, and it is entirely
| disabled by default for client connections. A remote,
| unauthenticated attacker can exploit this by sending a small, highly
| compressed payload (a decompression bomb), causing unbounded memory
| allocation that triggers an Out-of-Memory (OOM) crash and a Denial
| of Service (DoS).


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-2026-15709
    https://www.cve.org/CVERecord?id=CVE-2026-15709
[1] https://gitlab.gnome.org/GNOME/libsoup/-/issues/511

Please adjust the affected versions in the BTS as needed.

Regards,
Salvatore
]