CVE-2026-90798: Apache CouchDB: Replicator follows redirects indefinitely

Severity: low (CVSS 0.6 v4.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-10-20 · updated 2026-10-20
Weakness: CWE-834

Description

A missing circuit-breaker in the replicator in Apache CouchDB 3.5.2 and below on all platforms allows the owner of a replication source or target to cause a denial of service via creating an infinite HTTP redirect loop. Users are recommended to upgrade to version 3.5.3, which fixes this issue.

Affected products

Apache Software Foundation Apache CouchDB: before 3.5.3 — fixed in 3.5.3

How to fix

Upgrade to a fixed version: Apache Software Foundation Apache CouchDB 3.5.3. Check the vendor advisory for mitigations.

References

https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f
https://lists.apache.org/thread/m6d526fj57pvq5pswm2lp1shbdz3f417
http://www.openwall.com/lists/oss-security/2026/10/20/13

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