CVE-2024-58340

CVE-2024-58340 · LangChain <= 0.3.1 MRKLOutputParser ReDoS

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LangChain versions up to and including 0.3.1 contain a regular expression denial-of-service (ReDoS) vulnerability in the MRKLOutputParser.parse() method (libs/langchain/langchain/agents/mrkl/output_parser.py). The parser applies a backtracking-prone regular expression when extracting tool actions from model output. An attacker who can supply or influence the parsed text (for example via prompt injection in downstream applications that pass LLM output directly into MRKLOutputParser.parse()) can trigger excessive CPU consumption by providing a crafted payload, causing significant parsing delays and a denial-of-service condition.

CVSS 8.7 · Élevée · EPSS 0,5% · Correctif disponible

Publication

2026-01-12T23:05:00.801Z

Mise à jour

2026-07-14T22:54:52.807Z

Pile logicielle: python

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