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.

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact High

No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

No EPSS score available.

Exploitation none

Automatable yes

Technical Impact partial

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions
Apache Software Foundation Apache CouchDB unaffected
Version Status Constraints
0 affected < 3.5.3

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Project Subscriptions

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Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.

Workaround

No workaround given by the vendor.

References
Link Providers
https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f cve-icon cve-icon
https://lists.apache.org/thread/gsbotof0qn8x6zlpd7t568ny4053jo0n cve-icon cve-icon
History

Tue, 20 Oct 2026 17:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-409
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}

Tue, 20 Oct 2026 15:45:00 +0000

Type Values Removed Values Added
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.
Title Apache CouchDB: Pre-authentication gzip decompression bomb via POST /_session
References
Metrics cvssV4_0

{'score': 7.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:H/E:U/S:N/AU:Y/R:A/V:D/RE:M/U:Red'}

Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: apache

Published:

Updated: 2026-10-20T16:52:44.129Z

Reserved: 2026-09-13T15:01:20.073Z

Link: CVE-2026-90797

cve-icon Vulnrichment

Updated: 2026-10-20T16:52:39.956Z

cve-icon NVD

Status : Received

Published: 2026-10-20T16:17:15.643

Modified: 2026-10-20T17:17:42.850

Link: CVE-2026-90797

cve-icon Redhat

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cve-icon OpenCVE Enrichment

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Weaknesses