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CVE-2026-90797

Apache CouchDB: Pre-authentication gzip decompression bomb via POST /_session

HIGH
7.7
CVSS Score
Published: October 20, 2026 at 03:39 PM UTC
Updated: October 20, 2026 at 07:34 PM UTC
1 product affected across 1 vendorCouchdb

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Severity
HIGH7.7
Exploit prediction
EPSS 0.7%
SSVC
No known exploit

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Couchdb· Apache
90%
All versions

Remediation

No guide yet

No remediation guidance has been written for this CVE yet. What the record does show:

Patch and advisory references

References (3)

Release Notes
Source: cverecord
https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f
Vendor Advisory
Source: cverecord
https://lists.apache.org/thread/gsbotof0qn8x6zlpd7t568ny4053jo0n
Source: af854a3a-2127-422b-91ae-364da2661108
http://www.openwall.com/lists/oss-security/2026/10/20/12

SSVC — Action Prioritization

SSVCNo known exploitAutomatablePartial impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

7.7HIGHapache
Vector?

Quick Info

StatusDEFERRED
CWE
CWE-409

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