PT-2026-57999 · Red Hat · Red Hat Enterprise Linux 10

Published 2026-07-14 · Updated 2026-07-14 · CVE-2026-12478

Mitre

CVSS v3.1

4.8

Medium

Base vector

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

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.

Fix

Out of bounds Read

Weakness Enumeration

CWE-125

Related Identifiers

CVE-2026-12478

Affected Products

Red Hat Enterprise Linux 10

References · 5

• https://nvd.nist.gov/vuln/detail/CVE-2026-12478 · Security Note
• https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/518 · Note
• https://access.redhat.com/security/cve/CVE-2026-12478 · Note
• https://bugzilla.redhat.com/show_bug.cgi?id=2489655 · Note
• https://access.redhat.com/security/cve/cve-2026-0716 · Note