Apache CouchDB chttpd Unbounded Gzip Decompression DoS (3.5.2)
CVE-2026-90797 Published on October 20, 2026
Apache CouchDB: Pre-authentication gzip decompression bomb via POST /_session
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.
Vulnerability Analysis
CVE-2026-90797 can be exploited with network access, and does not require authorization privileges or user interaction. This vulnerability is considered to have a low attack complexity. The potential impact of an exploit of this vulnerability is considered to have no impact on confidentiality and integrity and availability.
Weakness Type
What is a Data Amplification Vulnerability?
The software does not handle or incorrectly handles a compressed input with a very high compression ratio that produces a large output. An example of data amplification is a "decompression bomb," a small ZIP file that can produce a large amount of data when it is decompressed.
CVE-2026-90797 has been classified to as a Data Amplification vulnerability or weakness.
Products Associated with CVE-2026-90797
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Affected Versions
Apache Software Foundation Apache CouchDB:- Before 3.5.3 is affected.