Vulnerabilities CVE-2026-12478

CVE-2026-12478

Medium

Open

TLP:CLEAR

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

NVD CVE.org

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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.

Details

CVSS Score: 4.8
EPSS Score ⓘ: 0.25%

16.4th percentile
CVSS Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L
Confidence: 90%
Published: Jul 14, 2026
Last Modified: Jul 15, 2026

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