Host command execution via substring blocklist bypass
Published May 12, 2026 · Updated May 12, 2026
OS command injection in JunoClaw plugin-shell before 0.x.y-security-1 allows local users to execute unauthorized host commands. The command-safety check compares a raw command string against an incomplete substring blocklist instead of validating the parsed executable token, so crafted arguments evade the denylist and reach the shell wrapper. Exploitation requires local access to a build exposing plugin-shell execution and the companion advisory’s path; successful use runs commands with the JunoClaw process privileges.
Summary
What happened
OS command injection in JunoClaw plugin-shell before 0.x.y-security-1 allows local users to execute unauthorized host commands. The command-safety check compares a raw command string against an incomplete substring blocklist instead of validating the parsed executable token, so crafted arguments evade the denylist and reach the shell wrapper. Exploitation requires local access to a build exposing plugin-shell execution and the companion advisory’s path; successful use runs commands with the JunoClaw process privileges.
The record
- CVE
- CVE-2026-43991
- Published
- May 12, 2026
- Updated
- May 12, 2026
- Vendor
- Dragonmonk111
- Product
- JunoClaw
- Classifications
- T1059
- Attack vector
- local
- Privileges
- Unavailable
Timeline
How it unfolded
- May 12, 2026CVE publishedPublication date reported by the CVE source.
- May 12, 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?
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- Affected versionversion=< v0.x.y-security-1
What conditions does exploitation require?
What is affected?
Published CVSS scores
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Attacks
What attackers are doing with it
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Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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