CVE-2026-12478

—

CVSS 3.1

4.8 medium

EPSS

<1%p34

Published

Jul 14, 2026 (Jul 14, 2026)

Modified

Sep 15, 2026

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.

Weakness: CWE-125
Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L

NVD CVE.org GitHub PoCs EPSS (0.4%)

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