What is CVE-2026-12478?

CVE-2026-12478 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Read. CVSS score: 4.8/10. Published 2026-07-14.

How severe is CVE-2026-12478?

Medium severity. CVSS v3 base score is 4.8 out of 10.

Out-of-bounds Read in Red Hat Enterprise Linux 10

CVE-2026-12478

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…

Vulnerability class: Buffer Overflow

CVSS v3 metric

CVSS v3 base score 4.8 (Medium). Vector: CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:L.

Affected products

Red Hat Enterprise Linux 10

Weakness classification (CWE)

CWE-125 — Out-of-bounds Read

References

secalert@redhat.com (x_refsource_REDHAT, vdb-entry)
secalert@redhat.com (x_refsource_REDHAT, technical-description)
secalert@redhat.com (x_refsource_REDHAT, issue-tracking)
secalert@redhat.com

Frequently asked questions

What is CVE-2026-12478?: CVE-2026-12478 is a medium-severity vulnerability in Red Hat Enterprise Linux 10, classified under Out-of-bounds Read. CVSS score: 4.8/10. Published 2026-07-14.
How severe is CVE-2026-12478?: Medium severity. CVSS v3 base score is 4.8 out of 10.