Authenticated worker crash via unbounded code output
Published Sep 2, 2026 · Updated Sep 3, 2026
Denial of service in Simular Agent S 0.3.1 and 0.3.2 allows remote authenticated users to crash its worker via crafted code output. CodeAgent's code_agent.py captures generated Python program output without enforcing a size limit, so excessive output exhausts worker memory. Low-privileged access to the code-execution workflow is required, and the demonstrated consequence is loss of the affected worker process.
Summary
What happened
Denial of service in Simular Agent S 0.3.1 and 0.3.2 allows remote authenticated users to crash its worker via crafted code output. CodeAgent's code_agent.py captures generated Python program output without enforcing a size limit, so excessive output exhausts worker memory. Low-privileged access to the code-execution workflow is required, and the demonstrated consequence is loss of the affected worker process.
The record
- CVE
- CVE-2026-84885
- Published
- Sep 2, 2026
- Updated
- Sep 3, 2026
- Vendor
- Simular
- Product
- Agent S
- Classifications
- CWE-404, T1499.004
- Attack vector
- network
- Privileges
- authenticated
Timeline
How it unfolded
- Sep 2, 2026CVE publishedPublication date reported by the CVE source.
- Sep 3, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.3.1
- Affected versionversion=0.3.2
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
- Agent-S CodeAgent Tool Output DoS Reportproof of concept · unverified
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Technologies
Your stack
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Your stack
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