What is CVE-2026-111804?

CVE-2026-111804 is a high-severity vulnerability in Apache Software Foundation Traffic Server, classified under Use After Free. CVSS score: 8.2/10. Published 2026-10-21.

How severe is CVE-2026-111804?

High severity. CVSS v3 base score is 8.2 out of 10.

Use After Free in Apache Software Foundation Traffic Server

CVE-2026-111804

Apache Traffic Server's experimental wasm plugin has a use-after-free in its transaction-close handler and forwards unvalidated guest-supplied metric IDs to the internal stats API. This issue affects Apache Traffic Server: from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 10.1.5 or 10.2.1, which fix the issue.

Vulnerability class: Use-After-Free

Published 2026-10-21.

CVSS v3 metric

CVSS v3 base score 8.2 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:H.

EPSS exploit prediction

No EPSS score from FIRST.org yet. New CVEs usually get one within a few days; no score means no signal yet, not low risk. How EPSS works.

Affected products

Apache Software Foundation Traffic Server — versions 10.2.0

Weakness classification (CWE)

CWE-416 — Use After Free

References

lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc (vendor-advisory)

Frequently asked questions

What is CVE-2026-111804?: CVE-2026-111804 is a high-severity vulnerability in Apache Software Foundation Traffic Server, classified under Use After Free. CVSS score: 8.2/10. Published 2026-10-21.
How severe is CVE-2026-111804?: High severity. CVSS v3 base score is 8.2 out of 10.