---
id: "CVE-2026-111810"
kind: "vulnerability"
aliases: ["CVE-2026-111810"]
title: "Apache Traffic Server: crafted headers flood the diagnostic log"
severity: "high"
cvss: 8.7
epss: 0.00263
exploited: false
status: "open"
category: "runtime"
products: []
ecosystems: []
tags: ["apache-traffic-server", "runtime", "self-hosted"]
not_affected_if: ["other-versions"]
published_at: "2026-10-21T20:17:22+00:00"
first_seen_at: "2026-10-23T21:57:29+00:00"
updated_at: "2026-10-24T13:15:54+00:00"
sources: [{"source": "nvd", "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-111810", "first_seen_at": "2026-10-23T21:57:29+00:00"}, {"source": "epss", "url": "https://api.first.org/data/v1/epss?cve=CVE-2026-111810", "first_seen_at": "2026-10-24T13:15:54+00:00"}]
---

# Apache Traffic Server: crafted headers flood the diagnostic log

Apache Traffic Server writes one unthrottled log line for every internal @ header it strips from a request. A single request with many such headers makes the proxy write far more log data than the request itself contains.

_Summary, check and fix written by a model from the sources; labelled as such._

## Fix

Upgrade to Apache Traffic Server 9.2.16, 10.1.5, or 10.2.1.

## Timeline

- 2026-10-23T21:57:29+00:00 nvd https://nvd.nist.gov/vuln/detail/CVE-2026-111810
- 2026-10-24T13:15:54+00:00 epss https://api.first.org/data/v1/epss?cve=CVE-2026-111810

## From the sources

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.

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_Free to read at a human pace. An API with keys and an MCP server are in preparation; early access: hello@infrastack.ai_