CVE-2022-31129Public exploitNetwork attack vector

Application hang via quadratic RFC 2822 parsing

Published Jul 6, 2022 · Updated Nov 3, 2025

Regular expression denial of service in Moment.js 2.18.0 through 2.29.3 allows attackers to hang applications via crafted date strings. The preprocessRFC2822 function's legacy-comment removal regex repeatedly rescans unmatched opening parentheses, producing quadratic CPU work. Exposure requires an application to pass attacker-controlled strings without length checks to the default Moment constructor, and the resulting event-loop blockage interrupts that application.

CVSS severity7.5
High
EPSS probability5.25%
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 Moment.js 2.18.0 through 2.29.3 allows attackers to hang applications via crafted date strings. The preprocessRFC2822 function's legacy-comment removal regex repeatedly rescans unmatched opening parentheses, producing quadratic CPU work. Exposure requires an application to pass attacker-controlled strings without length checks to the default Moment constructor, and the resulting event-loop blockage interrupts that application.

The record

CVE
CVE-2022-31129
Published
Jul 6, 2022
Updated
Nov 3, 2025
Vendor
Moment.js
Product
Moment.js
Classifications
CWE-1333, CWE-400, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jul 6, 2022CVE publishedPublication date reported by the CVE source.
  2. Nov 3, 2025Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=>= 2.18.0, < 2.29.4

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

Moment.js · Moment.jsversion=>= 2.18.0, < 2.29.4

Published CVSS scores

7.5GitHubCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
7.5NVDCVSS: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)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-1333Inefficient Regular Expression Complexity
CWE-400Uncontrolled Resource Consumption
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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