CVE-2025-48887

Description

vLLM, an inference and serving engine for large language models (LLMs), has a Regular Expression Denial of Service (ReDoS) vulnerability in the file `vllm/entrypoints/openai/tool_parsers/pythonic_tool_parser.py` of versions 0.6.4 up to but excluding 0.9.0. The root cause is the use of a highly complex and nested regular expression for tool call detection, which can be exploited by an attacker to cause severe performance degradation or make the service unavailable. The pattern contains multiple nested quantifiers, optional groups, and inner repetitions which make it vulnerable to catastrophic backtracking. Version 0.9.0 contains a patch for the issue.

Reserved 2025-05-27 | Published 2025-05-30 | Updated 2025-05-30 | Assigner GitHub_M

Problem types

CWE-1333: Inefficient Regular Expression Complexity

Product status

>= 0.6.4, < 0.9.0
affected

References

github.com/...t/vllm/security/advisories/GHSA-w6q7-j642-7c25

github.com/vllm-project/vllm/pull/18454

github.com/...ommit/4fc1bf813ad80172c1db31264beaef7d93fe0601

cve.org (CVE-2025-48887)

nvd.nist.gov (CVE-2025-48887)

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