PYSEC-2026-3478
Vulnerability from pysec - Published: 2026-07-23 11:41 - Updated: 2026-07-23 14:31
VLAI
Details
Impact
LiteLLM's Custom Code Guardrails production create/update paths did not apply the same sandboxing and validation used by the test endpoint.
A privileged user with access to create or update guardrails could submit custom Python code that executed in the LiteLLM proxy environment. In deployments without a configured master key, callers could be treated as proxy administrators, making this reachable without intended administrative authorization.
This could allow arbitrary code execution in the LiteLLM proxy container and exposure of secrets available to the process.
Patches
The issue is fixed in 1.82.0-stable.
LiteLLM recommend upgrading to 1.82.0-stable or later.
Workarounds
If upgrading is not immediately possible:
- Restrict access to
POST /guardrailsandPUT /guardrails/{guardrail_id}to trusted administrators only. - Ensure
LITELLM_MASTER_KEYis configured. - Avoid enabling Custom Code Guardrails for untrusted users.
Severity
Impacted products
| Name | purl | litellm | pkg:pypi/litellm |
|---|
Aliases
{
"affected": [
{
"package": {
"ecosystem": "PyPI",
"name": "litellm",
"purl": "pkg:pypi/litellm"
},
"ranges": [
{
"events": [
{
"introduced": "0"
},
{
"fixed": "1.82.0"
}
],
"type": "ECOSYSTEM"
}
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]
}
],
"aliases": [
"CVE-2026-59821",
"GHSA-72m8-9m7m-h278"
],
"details": "### Impact\n\nLiteLLM\u0027s Custom Code Guardrails production create/update paths did not apply the same sandboxing and validation used by the test endpoint.\n\nA privileged user with access to create or update guardrails could submit custom Python code that executed in the LiteLLM proxy environment. In deployments without a configured master key, callers could be treated as proxy administrators, making this reachable without intended administrative authorization.\n\nThis could allow arbitrary code execution in the LiteLLM proxy container and exposure of secrets available to the process.\n\n### Patches\n\nThe issue is fixed in `1.82.0-stable`.\n\nLiteLLM recommend upgrading to `1.82.0-stable` or later.\n\n### Workarounds\n\nIf upgrading is not immediately possible:\n\n1. Restrict access to `POST /guardrails` and `PUT /guardrails/{guardrail_id}` to trusted administrators only.\n2. Ensure `LITELLM_MASTER_KEY` is configured.\n3. Avoid enabling Custom Code Guardrails for untrusted users.",
"id": "PYSEC-2026-3478",
"modified": "2026-07-23T14:31:33.531173Z",
"published": "2026-07-23T11:41:48.799224Z",
"references": [
{
"type": "WEB",
"url": "https://github.com/BerriAI/litellm/security/advisories/GHSA-72m8-9m7m-h278"
},
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-59821"
},
{
"type": "WEB",
"url": "https://github.com/BerriAI/litellm/commit/e50b4486d0f7aa0497185a1ebcdd2c91f1769eba"
},
{
"type": "PACKAGE",
"url": "https://github.com/BerriAI/litellm"
},
{
"type": "WEB",
"url": "https://github.com/BerriAI/litellm/releases/tag/v1.82.0-stable"
},
{
"type": "PACKAGE",
"url": "https://pypi.org/project/litellm"
},
{
"type": "ADVISORY",
"url": "https://github.com/advisories/GHSA-72m8-9m7m-h278"
}
],
"severity": [
{
"score": "CVSS:4.0/AV:N/AC:L/AT:P/PR:H/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N",
"type": "CVSS_V4"
}
],
"summary": "LiteLLM: Custom Code Guardrails production endpoints bypass code safety checks"
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.
Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
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