Description
A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.
Published: 2026-09-29
Score: 8.6 High
EPSS: n/a
KEV: No
Impact: n/a
Action: n/a
AI Analysis

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Remediation

Vendor Workaround

To mitigate avoid connecting custom handlers to SoupWebsocketConnection::pong, or avoid WebSocket use with untrusted peers.

Tracking

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Advisories

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History

Tue, 29 Sep 2026 18:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Tue, 29 Sep 2026 16:30:00 +0000

Type Values Removed Values Added
Description A flaw was found in libsoup. When handling an incoming WebSocket Pong frame, SoupWebsocketConnection emitted the ::pong signal with a GByteArray pointer even though the signal is declared to pass a GBytes. Applications connecting a handler that follows the documented GBytes API can trigger heap corruption or a crash upon receiving a crafted Pong.
Title Libsoup: libsoup: heap buffer overflow from websocket pong signal type confusion
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-843
CPEs cpe:/o:redhat:enterprise_linux:10
cpe:/o:redhat:enterprise_linux:6
cpe:/o:redhat:enterprise_linux:7
cpe:/o:redhat:enterprise_linux:8
cpe:/o:redhat:enterprise_linux:9
Vendors & Products Redhat
Redhat enterprise Linux
References
Metrics cvssV3_1

{'score': 8.6, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H'}


Subscriptions

Redhat Enterprise Linux
cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-29T17:24:13.042Z

Reserved: 2026-09-29T13:19:05.617Z

Link: CVE-2026-102556

cve-icon Vulnrichment

Updated: 2026-09-29T17:24:06.998Z

cve-icon NVD

Status : Received

Published: 2026-09-29T17:17:06.460

Modified: 2026-09-29T18:17:08.113

Link: CVE-2026-102556

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses