CVE-2022-25883Public exploitNetwork attack vector

Application hang via greedy whitespace regular expressions

Published Jun 21, 2023 · Updated Dec 6, 2024

Regular expression denial of service in npm semver before 7.5.2 allows remote attackers to hang applications with crafted ranges. The Range parser applies greedy whitespace patterns to untrusted range text, making matching consume excessive CPU until completion. The consequence is an application hang only when consuming code passes attacker-controlled range strings to the library.

CVSS severity7.5
High
EPSS probability2.76%
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 npm semver before 7.5.2 allows remote attackers to hang applications with crafted ranges. The Range parser applies greedy whitespace patterns to untrusted range text, making matching consume excessive CPU until completion. The consequence is an application hang only when consuming code passes attacker-controlled range strings to the library.

The record

CVE
CVE-2022-25883
Published
Jun 21, 2023
Updated
Dec 6, 2024
Vendor
npm
Product
semver
Classifications
CWE-1333, T1499.004
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 21, 2023CVE publishedPublication date reported by the CVE source.
  2. Dec 6, 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 <7.5.2

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

npm · semverversion=0 <7.5.2

Published CVSS scores

7.5GitHub Advisory DatabaseCVSS: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.

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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
T1499.004Endpoint Denial of Service: Application 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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