CVE-2024-39249

Application hang via backtracking parameter regexes

Published Jul 1, 2024 · Updated Aug 26, 2024

Regular expression denial of service in Async 2.6.4 and earlier and 3.2.5 and earlier allows attackers to hang applications. autoInject's parseParams routine converts task functions to source text and applies backtracking parameter-list regexes that consume excessive CPU on crafted text. The supplier disputes practical exploitability because application code, rather than untrusted input, supplies those functions; the bounded consequence is a CPU-driven service interruption.

CVSS severity7.5
High
EPSS probability0.82%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Regular expression denial of service in Async 2.6.4 and earlier and 3.2.5 and earlier allows attackers to hang applications. autoInject's parseParams routine converts task functions to source text and applies backtracking parameter-list regexes that consume excessive CPU on crafted text. The supplier disputes practical exploitability because application code, rather than untrusted input, supplies those functions; the bounded consequence is a CPU-driven service interruption.

The record

CVE
CVE-2024-39249
Published
Jul 1, 2024
Updated
Aug 26, 2024
Vendor
Caolan McMahon
Product
Async
Classifications
CWE-1333, T1499.004
Attack vector
Unavailable
Privileges
Unavailable

Timeline

How it unfolded

  1. Jul 1, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 26, 2024Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0 <=2.6.4
  2. Affected versionversion=0 <=3.2.5

What conditions does exploitation require?

Attack vectorUnavailable in this record.
Required privilegesUnavailable in this record.

What is affected?

Caolan McMahon · Asyncversion=0 <=2.6.4; version=0 <=3.2.5

Published CVSS scores

7.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
VectorUnavailable
PrivilegesUnavailable
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
T1499.004Application or System Exploitation

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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