Vulnerability · Published Aug 4, 2026 · Assigned by VulnCheck

CVE-2026-69098kotaemon 0.12.0 Unauthenticated Remote Code Execution via Insecure Deserialization

Critical 9.8

In plain English

A critical-severity unsafe deserialization in kotaemon from Cinnamon. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.9% (higher than 60% of all known vulnerabilities). Ready-made attack tooling exists: public proof-of-concept code.

Severity (CVSS 3.1)9.8Critical

Exploit odds (30 days)0.9%top 39.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack tooling1Public PoC

Official description

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.

Affected products (as reported)

Vendor	Product	Versions
Cinnamon	kotaemon	0 – through 0.12.0

Weakness: CWE-502 · Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

References

Researcher Disclosure technical-description, exploit
https://www.vulncheck.com/advisories/kotaemon-unauthenticated-remote-code-execution-via-insecure-deserialization third-party-advisory