Vulnerability Details CVE-2025-48887
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.
Exploit prediction scoring system (EPSS) score
EPSS Score 0.0
EPSS Ranking 11.9%
CVSS Severity
CVSS v3 Score 6.5
References
Products affected by CVE-2025-48887
-
cpe:2.3:a:vllm:vllm:0.6.4
-
cpe:2.3:a:vllm:vllm:0.6.5
-
cpe:2.3:a:vllm:vllm:0.6.6
-
cpe:2.3:a:vllm:vllm:0.7.0
-
cpe:2.3:a:vllm:vllm:0.7.1
-
cpe:2.3:a:vllm:vllm:0.7.2
-
cpe:2.3:a:vllm:vllm:0.7.3
-
cpe:2.3:a:vllm:vllm:0.8.0
-
cpe:2.3:a:vllm:vllm:0.8.1
-
cpe:2.3:a:vllm:vllm:0.8.2
-
cpe:2.3:a:vllm:vllm:0.8.3
-
cpe:2.3:a:vllm:vllm:0.8.4
-
cpe:2.3:a:vllm:vllm:0.8.5