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  4. CVE 2026 90797 apache couchdb pre authentication gzip
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Back to active CVEs
High · CVSS 7.7CVE-2026-90797

Apache CouchDB: Pre-authentication gzip decompression bomb via POST /_sessionCVE-2026-90797

Answer in brief

CVE-2026-90797 records a High severity (CVSS 7.7) vulnerability in Apache CouchDB: Pre-authentication gzip decompression bomb via POST /_session. The current sources do not mark it as known exploited. The current feed maps Apache Software Foundation/Apache CouchDB (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 20, 2026Updated Oct 20, 2026Source checked Oct 25, 2026First seen by HOL Oct 20, 2026Material review Oct 20, 2026
Upstream Advisory

Key facts

Risk
High · CVSS 7.7
Exploitation
Not marked as known exploited
Affected software
1 mapped package or product
Fix availability
Available

Why this deserves its current priority

CVSS is 7.7. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Apache Software Foundation/Apache CouchDB (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Apache Software Foundation/Apache CouchDBgeneric>=0 <3.5.33.5.3

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Apache Software Foundation/Apache CouchDB.
  2. 2Review the reported fix. Update Apache Software Foundation/Apache CouchDB to 3.5.3 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 20, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Oct 20, 2026

Sources and claim methodology

  • Source referencelists.apache.org
  • Source referencelists.apache.org
  • Source referenceopenwall.com
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.

Record context

Vulnerability class
Missing Auth
EPSS
Not reported
CWE IDs
CWE-409
Source
CVE List V5
Source checked
Oct 25, 2026
References
3 linked sources
Open source record