CVE-2026-12478

MEDIUM SEVERITY

CVSS Score & Metrics

Base Score

4.8 / 10

Vector String

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

Vulnerability 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.

Vulnerability Details

Published Date

July 14, 2026

Last Modified

July 14, 2026

CWE ID

CWE-125

Source

NVD

Vendor

Red Hat

Product

Red Hat Enterprise Linux 10

External References

https://access.redhat.com/security/cve/CVE-2026-12478
https://access.redhat.com/security/cve/cve-2026-0716
https://bugzilla.redhat.com/show_bug.cgi?id=2489655
https://gitlab.gnome.org/GNOME/libsoup/-/merge_requests/518

CVE-2026-12478

CVSS Score & Metrics

Vulnerability Description

Vulnerability Details

External References

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