Detections
Analytics
CVE-2026-12478
medium
Description
The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) placed the integer overflow guard inside the if (masked) block, leaving unmasked server-to-client frames unprotected. A malicious WebSocket server can send a crafted unmasked frame with a payload length near UINT64_MAX to trigger an OOB read in a libsoup-based client when max_incoming_payload_size is set to 0.
References
https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/518
https://bugzilla.redhat.com/show_bug.cgi?id=2489655