---
id: CVE-2026-111810
title: >-
  Apache Traffic Server: Unthrottled per-header diagnostic logging enables a
  log-flood denial of service
summary: >-
  Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled
  diagnostic log line for every internal @ header they strip, so a request
  carrying many such headers makes the proxy write far more log data than the
  request contains.

  …
severity: high
cvss: 7.5
cvssVector: 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'
cvssSource: cna
cwe:
  - CWE-400
vendor: Apache Software Foundation
product: Apache Traffic Server
affected:
  - apache_traffic_server 9.2.15
  - apache_traffic_server 10.1.4
  - apache_traffic_server 10.2.0
published: '2026-10-21'
updated: '2026-10-21'
sourceUpdated: '2026-10-21T19:14:50.479Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-111810'
references:
  - url: 'https://lists.apache.org/thread/r95dq29ywcd1f4x30snxlqmb12z4s4kc'
tags:
  - cve.org
ingestedAt: '2026-10-21T20:11:44.910Z'
---

## Overview

Apache Traffic Server 9.2.15, 10.1.4 and 10.2.0 write one unthrottled diagnostic log line for every internal @ header they strip, so a request carrying many such headers makes the proxy write far more log data than the request contains.



This issue affects Apache Traffic Server: 9.2.15, 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.

## Affected

- `apache_traffic_server 9.2.15`
- `apache_traffic_server 10.1.4`
- `apache_traffic_server 10.2.0`

## Remediation

Refer to the linked advisories for vendor-supplied fixes and affected version ranges.