High severity · published Oct 20, 2026
CVE-2026-90797
Apache CouchDB: Pre-authentication gzip decompression bomb via POST /_session
7.7
CVSS
0.7%
EPSS
No
On KEV
Description
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.
Exploitation
Is it being used?
Exploit prediction (EPSS)0.7% · higher than 52% of CVEs
Exploited in the wildNo evidence yet
CISA KEVNot listed
Ransomware campaign useNot known
Affected products
Which versions
AC
Apache CouchDB · Apache Software Foundation
before 3.5.3 · source: vendor
References
NVD
https://nvd.nist.gov/vuln/detail/CVE-2026-90797
CVE.org
https://www.cve.org/CVERecord?id=CVE-2026-90797
lists.apache.org
https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f
lists.apache.org
https://lists.apache.org/thread/gsbotof0qn8x6zlpd7t568ny4053jo0n
www.openwall.com
http://www.openwall.com/lists/oss-security/2026/10/20/12
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