CVE-2026-102559

Description

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.

CVSS Vector

References

• https://access.redhat.com/security/cve/CVE-2026-102559
• https://bugzilla.redhat.com/show_bug.cgi?id=2543285