Unauthenticated code execution via unsafe Python eval
Published Sep 24, 2025 · Updated Sep 24, 2025
Code injection in Meta Platforms, Inc. Llama Stack before 0.2.20 allows remote attackers to execute Python through crafted BFCL input. The resolve_ast_by_type routine converts attacker-controlled binary-operation and lambda AST nodes back to source text and passes them to Python eval. No authentication or user interaction is required, and successful exploitation executes within the server process when BFCL scoring handles crafted evaluation data.
Summary
What happened
Code injection in Meta Platforms, Inc. Llama Stack before 0.2.20 allows remote attackers to execute Python through crafted BFCL input. The resolve_ast_by_type routine converts attacker-controlled binary-operation and lambda AST nodes back to source text and passes them to Python eval. No authentication or user interaction is required, and successful exploitation executes within the server process when BFCL scoring handles crafted evaluation data.
The record
- CVE
- CVE-2025-55178
- Published
- Sep 24, 2025
- Updated
- Sep 24, 2025
- Vendor
- Meta Platforms, Inc.
- Product
- Llama Stack
- Classifications
- CWE-20, T1059.006
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Sep 24, 2025CVE publishedPublication date reported by the CVE source.
- Sep 24, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
Compare your product and version with the public record. A matching version still requires validation against your environment.
Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=0.0.0 <0.2.20
What conditions does exploitation require?
What is affected?
Published CVSS scores
CVSS describes severity. EPSS estimates exploitation probability.
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
No public exploit references are available in this record.
Labels summarize the accepted research assessment. They do not indicate a test against your environment.
Technologies
Your stack
See the directory against your own environment.
Your stack
Check the software in your environment
Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.
Book a demo