CVE-2026-12478

Published: Jul 14, 2026Modified: Jul 15, 2026

4.8

Vector

CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

Exploitability: 2.2 / Impact: 2.5

Source: secalert@redhat.com (Secondary)

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.

Related CWEs

CWE-125

Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

References (4)

https://access.redhat.com/security/cve/CVE-2026-12478

Source: secalert@redhat.com

https://access.redhat.com/security/cve/cve-2026-0716

Source: secalert@redhat.com

https://bugzilla.redhat.com/show_bug.cgi?id=2489655

Source: secalert@redhat.com

https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/518

Source: secalert@redhat.com

Timeline

No history available yet.