CVE-2026-90797
HIGH 7.7An 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.
Severe if exploited (CVSS 7.7), but no known exploitation and low modeled probability. Patch on a normal cadence.
Exploitation likelihood
0.7%chance of exploitation in 30 days · 52nd percentile
Impact if exploited
7.7CVSS 4.0 · HIGH
- ConfidentialityNone
- IntegrityNone
- AvailabilityHigh
What an attacker needs
- ✓Access: Reachable over the network — no local access needed
- ✓Privileges: No account or privileges required
- ✓User interaction: No user interaction needed
- ✓Complexity: No special conditions — reliably repeatable
- ✓Requirements: No special attack requirements
✓ lowers the bar for an attacker · ⚠ raises it
Proof of concept
No public PoC is currently catalogued.
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Data snapshot:
Weakness (CWE)
- CWE-409: Improper Handling of Highly Compressed Data (Data Amplification)
CVSS 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
References and research data (JSON)
All CVSS metrics
- HIGH 7.7 v4.0 · CNA Primary
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 - HIGH 7.7 v4.0 · NVD Secondary
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/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:N/AU:Y/R:A/V:D/RE:M/U:Red
References
Patches & mitigations
- https://lists.apache.org/thread.html/pj83174r8f8f64odf47fwhozbfjtot0f CVE record · apache · Updated 2026-10-20T15:39:23.376Z
NVD · CVE-2026-90797 · Updated 2026-10-20T19:34:00.700
Advisories
- https://lists.apache.org/thread/gsbotof0qn8x6zlpd7t568ny4053jo0n CVE record · apache · Updated 2026-10-20T15:39:23.376Z
NVD · CVE-2026-90797 · Updated 2026-10-20T19:34:00.700 - https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-105156 EUVD · EUVD-2026-105156
Technical & other
- http://www.openwall.com/lists/oss-security/2026/10/20/12CVE record · CVE · Updated 2026-10-20T18:10:06.210Z
NVD · CVE-2026-90797 · Updated 2026-10-20T19:34:00.700