CVE-2026-90799: Apache CouchDB: Atom-table exhaustion in _changes sequences and _search bookmarks with specially crafted sequence values

Severity: low (CVSS 1.3 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-502

Description

Unsafe binary deserialisation in chttpd in Apache CouchDB 3.5.2 and below on all platforms allows an authenticated user to cause a denial of service via memory exhaustion. 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/bqxkm19hw8985t7opz675b29hs1zl4z9
http://www.openwall.com/lists/oss-security/2026/10/20/14

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