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9.1

Apache CouchDB lets anyone read system databases

CVE-2026-90800 · published 11 days ago
Summary

Versions of Apache CouchDB up to 3.5.2 let anyone retrieve the full contents of special _users or _replicator databases without proper permission. This could expose user or replication information. Upgrade to version 3.5.3 or later to close the gap.

What to do
  • Update couchdb to version 3.5.3.
  • Update apache software foundation apache couchdb to version 3.5.3 or later.
Affected software
Ecosystem VendorProductAffected versions
– apache software foundation apache couchdb < 3.5.3
Ubuntu:16.04:LTS canonical couchdb All versions
Bitnami – couchdb < 3.5.3
Fix: upgrade to 3.5.3
Original advisory text
Apache CouchDB: Auth bypass in prefixed _users and _replicator databases
Missing authorisation checks in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows any request to read the full contents of a prefixed _user or _replicator database via an unauthorised API endpoint.


The use of prefixed system databases is very rare.

Users are recommended to upgrade to version 3.5.3, which fixes this issue.
References
Fix within
Internet-facing 14 days
Internal At next upgrade
  • Not known to be exploited
  • Needs hands-on effort to exploit
  • Gives an attacker full control
Severity
9.1 Critical
Exploitation
<1% chance of attack within 30 days
Type
CWE-862Missing Authorization
Timeline
Published29 Oct 2026
Updated7 Nov 2026
First seen20 Oct 2026
Sources
CVE-2026-90800 · NVD
CVE-2026-90800 · MITRE
UBUNTU-CVE-2026-90800 · OSV
BIT-couchdb-2026-90800 · OSV
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