Deserialization in Cinnamon Kotaemon
CVE-2026-69098
kotaemon through 0.12.0 contains an insecure deserialization vulnerability in the check_connection endpoint that allows unauthenticated attackers to instantiate arbitrary Python classes by supplying crafted YAML/JSON input with a __type__ field. Attackers can exploit this to override the __type__ field with subprocess.check_output and arbitrary arguments, achieving remote code execution with application process privileges.
Vulnerability class: Insecure Deserialization
EPSS: 0.007 (51.3th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Cinnamon Kotaemon — versions 0
Weakness classification (CWE)
Public proof-of-concept exploits
References
- disclosure@vulncheck.com (technical-description, exploit)
- disclosure@vulncheck.com (third-party-advisory)
Frequently asked questions
- What is CVE-2026-69098?
- CVE-2026-69098 is a critical-severity vulnerability in Cinnamon Kotaemon, classified under Deserialization of Untrusted Data. CVSS score: 9.8/10. Published 2026-08-04.
- How severe is CVE-2026-69098?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-69098 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.