CVE-2024-58340

Description

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.

How to fix CVE-2024-58340

To remediate CVE-2024-58340, upgrade the affected package to a fixed version below.

• —upgrade to 1.0.0a1 or later

Is CVE-2024-58340 being exploited?

Low — EPSS is 0.1%, meaning exploitation activity has not been observed at scale.

Affected packages (1)

• from 0, < 1.0.0a1

CVSS scores

References (4)

• ADVISORYwww.vulncheck.com/advisories/langchain-mrkloutputparser-redos
• PATCHgithub.com/langchain-ai/langchain
• REPORThuntr.com/bounties/e7ece02c-d4bb-4166-8e08-6baf4f8845bb
• WEBwww.langchain.com