CRITICAL9.8

PYSEC-2026-387

LiteLLM has Server-Side Template Injection vulnerability in /completions endpoint

Quick fix

PYSEC-2026-387 — litellm: upgrade to the fixed version with the command below.

pip install --upgrade 'litellm>=1.34.42'

Details

BerriAI/litellm is vulnerable to Server-Side Template Injection (SSTI) via the `/completions` endpoint. The vulnerability arises from the `hf_chat_template` method processing the `chat_template` parameter from the `tokenizer_config.json` file through the Jinja template engine without proper sanitization. Attackers can exploit this by crafting malicious `tokenizer_config.json` files that execute arbitrary code on the server.

Are you affected?

Enter the version of the package you're using.

Affected packages

PyPI/litellm

Introduced in: 0Fixed in: 1.34.42

Fixpip install --upgrade 'litellm>=1.34.42'

References

https://nvd.nist.gov/vuln/detail/CVE-2024-2952[ADVISORY]
https://github.com/BerriAI/litellm/issues/2949[WEB]
https://github.com/BerriAI/litellm/pull/2941[WEB]
https://github.com/BerriAI/litellm/commit/8a1cdc901708b07b7ff4eca20f9cb0f1f0e8d0b3[WEB]
https://github.com/BerriAI/litellm[PACKAGE]
https://github.com/BerriAI/litellm/blob/0d803e13798db40aa7463e64a6bafaee386424f5/litellm/proxy/proxy_server.py#L2087[WEB]
https://huntr.com/bounties/a9e0a164-6de0-43a4-a640-0cbfb54220a4[WEB]
https://pypi.org/project/litellm[PACKAGE]
https://github.com/advisories/GHSA-46cm-pfwv-cgf8[ADVISORY]