---
id: CVE-2026-65100
title: >-
  Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming
  the header block encoded successfully, so an encode failure leaves the encoder
  out of sync with the peer decoder and corrupts subsequent header blocks on the
  …
summary: >-
  Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming
  the header block encoded successfully, so an encode failure leaves the encoder
  out of sync with the peer decoder and corrupts subsequent header blocks on the
  …
severity: medium
cvss: 4.8
cvssVector: 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:L/A:L'
cwe:
  - CWE-696
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: '2026-10-01T18:17:26.850'
source: NVD
sourceUrl: 'https://nvd.nist.gov/vuln/detail/CVE-2026-65100'
references:
  - url: 'https://lists.apache.org/thread/5prl9glcm9g2swnq9hqxvnokylm1gr6d'
    label: security@apache.org
tags:
  - nvd
  - cve.org
ssvc:
  exploitation: none
  automatable: 'no'
  technicalImpact: partial
  timestamp: '2026-07-29T12:10:15.907595Z'
epss: 0.0058
epssPercentile: 0.45678
ingestedAt: '2026-10-01T18:55:42.331Z'
---

## Overview

Apache Traffic Server updates the HTTP/2 HPACK dynamic table before confirming the header block encoded successfully, so an encode failure leaves the encoder out of sync with the peer decoder and corrupts subsequent header blocks on the connection.



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`