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Public proof of conceptFix available

CVE-2025-8262

A public proof of concept exists; no exploitation attested.

  • Published2025-07-28
  • WeaknessCWE-1333 · CWE-400

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

Description

A vulnerability was found in yarnpkg Yarn up to 1.22.22. It has been classified as problematic. Affected is the function explodeHostedGitFragment of the file src/resolvers/exotics/hosted-git-resolver.js. The manipulation leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The patch is identified as 97731871e674bf93bcbf29e9d3258da8685f3076. It is recommended to apply a patch to fix this issue.

Timeline

dates in UTC
  1. 2025-07-2807:15CVE publishedNVD

Versions per branch

NVD
Yarnpkg yarn
BranchAffectedFixed in
1.22≤ 1.22.22no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Products declared by the CNA1 product

As VulDB, the CNA that assigned this CVE, declared them in the CVE record; versions as written.

  • yarnpkg Yarn
    Affected
    • = 1.22.0no fix stated
    • = 1.22.1no fix stated
    • = 1.22.2no fix stated
    • = 1.22.3no fix stated
    • = 1.22.4no fix stated
    • = 1.22.5no fix stated
    • = 1.22.6no fix stated
    • = 1.22.7no fix stated

    15 more version lines in the CVE record.

Source: the CNA record (CVE Program), © The MITRE Corporation,CVE Terms of UseCVE recordupdated 2025-07-28

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • node-yarnpkgUbuntu:26.10all versions · no fixed version listed
  • node-yarnpkgUbuntu:26.04:LTSall versions · no fixed version listed
  • node-yarnpkgUbuntu:25.10all versions · no fixed version listed
  • node-yarnpkgUbuntu:24.04:LTSall versions · no fixed version listed
  • node-yarnpkgUbuntu:22.04:LTSall versions · no fixed version listed
  • node-yarnpkgUbuntu:20.04:LTSall versions · no fixed version listed
  • node-yarnpkgDebian:14all versions · no fixed version listed
  • node-yarnpkgDebian:13all versions · no fixed version listed

7 more package ranges on OSV.dev

Vendor advisories

  • CVE-2025-8262 Red Hat Product Security

    github.com/yarnpkg/yarn: Yarn Regex Complexity Vulnerability

Full record on NVD

Fix

Advisories and patches

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

  • CISA-ADPSSVC decisionpoc2025-07-28
  • CNACVSS 4.05.3known since 2026-10-23
  • CNACVSS 3.14.3known since 2026-10-23
  • NVDCVSS 3.17.5read 2026-10-23
  • CNACVSS 2.04known since 2026-10-23
  • CNAweakness (CWE)CWE-1333, CWE-400known since 2026-10-23
  • NVDweakness (CWE)CWE-1333read 2026-10-23
  • FIRST EPSSEPSS score0.8 %2026-11-08
  • OSVaffected packages—
  • GitHub Advisoriesadvisory—

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CVSS 4.0 vector
CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Published
2025-07-28
Last Modified
2026-06-17
NVD status
Analyzed
GitHub Advisory
GHSA-9xhp-f235-5v37

Frequently asked questions

What is CVE-2025-8262?

A vulnerability was found in yarnpkg Yarn up to 1.22.22. It has been classified as problematic. Affected is the function explodeHostedGitFragment of the file src/resolvers/exotics/hosted-git-resolver.js. The manipulation leads to inefficient regular expression complexity. It is possible to launch the attack remotely. The patch is identified as 97731871e674bf93bcbf29e9d3258da8685f3076. It is recommended to apply a patch to fix this issue.

Is CVE-2025-8262 actively exploited?

A proof-of-concept exploit exists for CVE-2025-8262, but active exploitation has not been confirmed at this time.

What is the CVSS score for CVE-2025-8262?

CVE-2025-8262 has a CVSS v3 base score of 7.5 (HIGH severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.

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