CVE-2026-12478 | The fix for CVE-2026-0716 (commit 6ff7ef0, libsoup 3.6.6) pl… | CVSS 4.8 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.

Metadata

CVE ID: CVE-2026-12478
State: PUBLISHED
Assigner: redhat
Reserved: 2026-06-16 21:25 UTC
Published: 2026-07-14 09:26 UTC
Last updated: 2026-07-14 10:06 UTC
Primary CWE: CWE-125
Out-of-bounds Read
Vendor / Product: Red Hat / Red Hat Enterprise Linux 10
Sources: cve.org · NVD

Severity & Metrics

4.8 MEDIUM CVSS 3.1

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

Affected products (1)

Vendor	Product	Platform	Versions
Red Hat	Red Hat Enterprise Linux 10	—	—

Weakness (CWE)

CWE	Source	Description
CWE-125	cna	Out-of-bounds Read

CVSS scores (1)

Score	Severity	Version	Source	Vector
4.8	MEDIUM	3.1	cna	CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

References (4)