CVE-2026-12478

MEDIUM

Red Hat Enterprise Linux 10 libsoup - Out-of-Bounds Read

Title source: manual
STIX 2.1

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 (4)

Core 4
Core References
Vdb Entry, X_Refsource_Redhat vdb-entry x_refsource_redhat
https://access.redhat.com/security/cve/CVE-2026-12478
Technical Description, X_Refsource_Redhat technical-description x_refsource_redhat
cve-2026-0716
https://access.redhat.com/security/cve/cve-2026-0716
Issue Tracking, X_Refsource_Redhat issue-tracking x_refsource_redhat
RHBZ#2489655
https://bugzilla.redhat.com/show_bug.cgi?id=2489655

Scores

CVSS v3 4.8
EPSS 0.0025
EPSS Percentile 16.3%
Attack Vector NETWORK
CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

CISA SSVC

Vulnrichment
Exploitation none
Automatable no
Technical Impact partial

Details

CWE
CWE-125
Status published
Products (1)
Red Hat/Red Hat Enterprise Linux 10
Published Jul 14, 2026
Tracked Since Jul 14, 2026