CVE-2026-111809
criticalApache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding.
Apache Traffic Server allows request smuggling via HEAD requests that carry Content-Length or Transfer-Encoding. This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.15, from 10.0.0 through 10.1.4, 10.2.0. Users are recommended to upgrade to version 9.2.16, 10.1.5, or 10.2.1, which fix the issue.
CVSS
9.3
9.3 (CVSS v3.1)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:L/I:H/A:N Severity source: NVD CVSS v3.1 (security@apache.org)
Timeline (UTC)
Published: 2026-10-21 20:17
Modified: 2026-10-28 02:17
NVD status: Awaiting Analysis
Last synced 18 hours ago
Verified against the source API 2026-10-28 11:30 UTC
Exploitation
Not listed in CISA KEV (as of last catalog sync)
Absence from KEV does not mean a CVE is not exploited. Exploitation status: unknown (no authoritative evidence in our sources).
Affected products
Not reported by the source (unknown — not "none").
Weakness classification (CWE)
Source: NVD / CISA. “NVD-CWE-Other” and “NVD-CWE-noinfo” mean NVD could not assign a specific weakness.
Mitigation & advisories
No vendor advisory or patch reference tagged by NVD. Check the references below.
References
- https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc security@apache.org
Data sources
NVD CVE API 2.0 — fetched 2026-10-28 11:30 UTC · record ↗