---
id: CVE-2026-90797
title: 'Apache CouchDB: Pre-authentication gzip decompression bomb via POST /_session'
summary: >-
  An unlimited gzip decompression routine in chttpd in Apache CouchDB 3.5.2 and
  below on all platforms allows any remote client to cause a denial of service
  via memory exhaustion.

  Users are recommended to upgrade to version 3.5.3, which fi…
severity: high
cvss: 7.7
cvssVector: >-
  CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/S:N/AU:Y/R:A/V:D/RE:M/U:Red
cvssSource: cna
vendor: Apache Software Foundation
product: Apache CouchDB
affected:
  - apache_couchdb < 3.5.3
ssvc:
  exploitation: none
  automatable: 'yes'
  technicalImpact: partial
  timestamp: '2026-10-20T16:52:22.312441Z'
published: '2026-10-20'
updated: '2026-10-20'
sourceUpdated: '2026-10-20T18:10:06.210Z'
source: CVEORG
sourceUrl: 'https://www.cve.org/CVERecord?id=CVE-2026-90797'
references:
  - url: 'https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f'
  - url: 'https://lists.apache.org/thread/gsbotof0qn8x6zlpd7t568ny4053jo0n'
tags:
  - cve.org
ingestedAt: '2026-10-20T16:10:53.309Z'
---

## Overview

An unlimited gzip decompression routine in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any remote client to cause a denial of service via memory exhaustion.
Users are recommended to upgrade to version 3.5.3, which fixes this issue.

## Affected

- `apache_couchdb < 3.5.3`

## Remediation

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