A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.

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Workaround

To mitigate this set a conservative max-total-incoming-message-size / incoming payload limits where the API allows, and do not accept WebSocket connections from untrusted peers.

History

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

Type Values Removed Values Added
Description A flaw was found in libsoup. When reassembling fragmented WebSocket messages into a GByteArray, libsoup did not adequately cap total message size against the limits of the underlying buffer type. A remote peer could send fragments that caused size truncation while the implementation still used the full length, leading to heap corruption or a crash.
Title Libsoup: libsoup: heap buffer overflow during websocket message reassembly
First Time appeared Redhat
Redhat enterprise Linux
Weaknesses CWE-125
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'}


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cve-icon MITRE

Status: PUBLISHED

Assigner: redhat

Published:

Updated: 2026-09-29T17:15:25.792Z

Reserved: 2026-09-29T13:19:12.882Z

Link: CVE-2026-102557

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-09-29T17:17:06.600

Modified: 2026-09-29T18:17:08.233

Link: CVE-2026-102557

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.

Weaknesses