---
id: CVE-2026-33930
title: >-
  Apache Traffic Server copies the client Host header into a fixed-size stack
  buffer without a bound during redirect handling, so an over-long Host header
  overflows the stack when redirect following is enabled.




  This issue affects Apache…
summary: >-
  Apache Traffic Server copies the client Host header into a fixed-size stack
  buffer without a bound during redirect handling, so an over-long Host header
  overflows the stack when redirect following is enabled.




  This issue affects Apache…
severity: medium
cvss: 5.9
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'
cwe:
  - CWE-121
vendor: apache
product: traffic_server
affected:
  - 'traffic_server >= 8.0.0, <= 8.1.9'
  - 'traffic_server >= 9.0.0, < 9.2.15'
  - 'traffic_server >= 10.0.0, < 10.1.4'
patched:
  - traffic_server 10.1.4
published: '2026-07-29'
updated: '2026-10-01'
sourceUpdated: '2026-10-01T17:17:23.520'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-33930'
references:
  - url: 'https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d'
    label: security@apache.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-29T13:10:04.022306Z'
epss: 0.00584
epssPercentile: 0.45938
ingestedAt: '2026-10-01T18:55:42.323Z'
---

## Overview

Apache Traffic Server copies the client Host header into a fixed-size stack buffer without a bound during redirect handling, so an over-long Host header overflows the stack when redirect following is enabled.



This issue affects Apache Traffic Server: from 8.0.0 through 8.1.11, from 9.0.0 through 9.2.14, from 10.0.0 through 10.1.3.



Users are recommended to upgrade to version 9.2.15 or 10.1.4, which fix the issue.

## Affected

- `traffic_server >= 8.0.0, <= 8.1.9`
- `traffic_server >= 9.0.0, < 9.2.15`
- `traffic_server >= 10.0.0, < 10.1.4`

## Remediation

Upgrade past the affected range:

- `traffic_server 10.1.4`