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kotaemon CVE-2026-69098

| EUVDEUVD-2026-52740 CRITICAL
Deserialization of Untrusted Data (CWE-502)
2026-08-04 VulnCheck GHSA-5cg2-9v3x-66cv
RCE Python Deserialization Kotaemon
9.3
CVSS 4.0 · Vendor: VulnCheck
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Severity by source

Vendor (VulnCheck) PRIMARY
9.3 CRITICAL
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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:X/AU:X/R:X/V:X/RE:X/U:X
vuln.today AI
9.8 CRITICAL

Unauthenticated network-reachable endpoint with low-complexity deserialization yields PR:N/AC:L/AV:N; RCE gives full C/I/A on the app host with no cross-system scope change.

3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
4.0 AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Primary rating from Vendor (VulnCheck).

CVSS VectorVendor: VulnCheck

CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/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:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
X

Lifecycle Timeline

2
Analysis Generated
Aug 04, 2026 - 16:06 vuln.today
CVE Published
Aug 04, 2026 - 15:15 cve.org
CRITICAL 9.3

DescriptionCVE.org

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.

Articles & Coverage 1

News Critical RCE in kotaemon (Cinnamon) via Insecure Deserialization - CVE-2026-69098 Aug 04, 2026

AnalysisAI

Remote code execution in kotaemon (Cinnamon) versions through 0.12.0 allows unauthenticated attackers to run arbitrary commands via the check_connection endpoint, which insecurely deserializes attacker-supplied YAML/JSON. By setting the __type__ field to subprocess.check_output with chosen arguments, an attacker instantiates arbitrary Python objects and executes OS commands with the application's process privileges. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
Reach exposed check_connection endpoint
Delivery
Craft YAML/JSON with __type__ set to subprocess.check_output
Exploit
Submit payload to trigger deserialization
Execution
Application instantiates malicious object
Persist
Arbitrary command executes as app process
Impact
Full host compromise / data access
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Vulnerability AssessmentAI

Exploitation The check_connection endpoint must be network-reachable by the attacker, and the target must be running kotaemon at or below version 0.12.0. … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The signals align toward genuine high priority for exposed instances. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario An attacker locates an internet-facing kotaemon instance and sends a crafted request to the check_connection endpoint with a YAML/JSON payload whose __type__ field is set to subprocess.check_output and whose arguments specify a shell command. The application deserializes and instantiates the object, executing the command with the app's privileges - no authentication or user interaction required. …
Remediation No vendor-released patched version is identified in the provided data (upstream tracking exists at https://github.com/Cinnamon/kotaemon/issues/844); monitor that issue and the project repository for a fixed release beyond 0.12.0 and upgrade as soon as one is published. … Detailed patch versions, workarounds, and compensating controls in full report.
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Recommended ActionAI

Within 24 hours, identify all systems running kotaemon through version 0.12.0, particularly any internet-facing or network-accessible deployments, and verify whether they run the check_connection endpoint. …

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Threat intelligence, references, and detailed analysis are available after sign-in.

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CVE-2026-69098 vulnerability details – vuln.today
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