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CVE-2026-12478

MediumPublished

Libsoup: incomplete fix for cve-2026-0716: out-of-bounds read in libsoup websocket frame processing (unmasked path)

Published: Jul 14, 2026
Updated: Sep 16, 2026
Assigning CNA: redhat
Evidence observed: Aug 8, 2026

Primary CVSS

4.8/ 10Medium

nvd · CVSS 3.1

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

EPSS probability estimate

0.4%

Low · next 30 days

Percentile: 32.6%
Model date: Sep 21, 2026

EPSS is a statistical estimate, not a certainty or a measure of impact. Combine it with CVSS, KEV status, exposure and your environment.

Summary

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.

Sources

security-researchResearch
Vulnerability research write-ups — CVE-2026-12478 (libsoup), Apple WebKit, Google VRP

Responsible use

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