CVE-2026-102559
8.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Summary
A flaw was found in libsoup. When constructing a masked WebSocket client frame for a very large outgoing payload, size values passed to GByteArray allocation APIs could be truncated while the masking routine still used the full length, causing a heap buffer overflow.
Affected Software
| Vendor | Product | Version Range | Status |
|---|
Weaknesses
- CWE-125: Out-of-bounds Read
Workarounds
To mitigate this enforce application-level limits on outgoing WebSocket message sizes. Do not send untrusted bulk data as a single WebSocket message.
References
- https://access.redhat.com/security/cve/CVE-2026-102559
- https://bugzilla.redhat.com/show_bug.cgi?id=2543285
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