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CowAgent CVE-2026-84427

| EUVDEUVD-2026-69782 LOW
Improper Resource Shutdown or Release (CWE-404)
2026-09-02 VulDB GHSA-wh78-4m24-7957
2.1
CVSS 4.0 · Vendor: VulDB

Severity by source

Vendor (VulDB) PRIMARY
2.1 MEDIUM
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/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
4.3 MEDIUM

Network-reachable with low-privilege auth required; impact is limited to low availability on the vulnerable system only.

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

Primary rating from Vendor (VulDB).

CVSS VectorVendor: VulDB

Attack Vector
Network
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
X

Lifecycle Timeline

4
Severity Changed
Sep 02, 2026 - 01:22 NVD
MEDIUM LOW
CVSS changed
Sep 02, 2026 - 01:22 NVD
5.3 (MEDIUM) 2.1 (LOW)
Analysis Generated
Sep 02, 2026 - 01:20 vuln.today
CVE Published
Sep 02, 2026 - 00:30 cve.org
MEDIUM 5.3

DescriptionCVE.org

A vulnerability was determined in zhayujie CowAgent up to 2.1.7. Affected is an unknown function of the file agent/tools/bash/bash.py of the component Bash Tool. Executing a manipulation can lead to denial of service. The attack can be launched remotely. The exploit has been publicly disclosed and may be utilized. The vendor was contacted early about this disclosure but did not respond in any way.

AnalysisAI

Denial of service in zhayujie CowAgent up to version 2.1.7 allows a low-privileged remote attacker to crash or degrade availability by manipulating input to the Bash Tool component (agent/tools/bash/bash.py). The root cause is CWE-404 (Improper Resource Shutdown or Release), suggesting the Bash Tool fails to bound, drain, or release output buffers when executing shell commands - consistent with the public PoC title 'CowAgent_Bash_Output_Buffer_DoS_Report'. …

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Attack ChainAIDerived

Hypothetical attack flow derived from CVE metadata

Access
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Delivery
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Exploit
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Execution
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Vulnerability AssessmentAI

Exploitation Exploitation requires valid credentials or an access token sufficient to invoke the CowAgent Bash Tool (PR:L). … Additional conditions and limiting factors are described in the full assessment.
Risk Assessment The CVSS 4.0 vector (AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L) and score of 5.3 reflect a moderate, network-reachable DoS requiring only low-privilege authentication. … Full risk analysis with EPSS, KEV, and SSVC signal comparison available after sign-in.
Exploit Scenario Full exploit scenario with step-by-step reproduction available after sign-in.
Remediation No vendor-released patch has been identified at time of analysis; the vendor was unresponsive to disclosure. … Detailed patch versions, workarounds, and compensating controls in full report.

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CVE-2026-84427 vulnerability details – vuln.today

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