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High, CVSS 7.5amended

email-existence Inefficient Regular Expression Complexity vulnerability

CVE-2018-25049GHSA-p27h-4cpf-fw48

What to do

Vendor response not established. Follow the primary source's mitigation guidance and check back for a fix.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • npm email-existence

    Affected
    <= 0.1.6
    Fixed in
    no fixed version recorded

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
7.5 · CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
EPSS
  • CVE-2018-25049: 0.78% estimated exploitation activity in the next 30 days; percentile 56.07 (FIRST EPSS, 2026-11-03). This is a model estimate, not proof of exploitation or customer exposure.
Source description

As published by the source; long descriptions are shortened.

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.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from ghsa record GHSA-p27h-4cpf-fw48

  2. Revision 1 · created ·

    Published from osv record GHSA-p27h-4cpf-fw48

Agent brief

Preview the exact text before you copy it. Commands are read-only suggestions; review them before running anything.

# Patch Next advisory brief: CVE-2018-25049

Advisory: email-existence Inefficient Regular Expression Complexity vulnerability
IDs: CVE-2018-25049, GHSA-p27h-4cpf-fw48
Record: https://patchnext.com/advisories/cve-2018-25049 (revision 2, source checked 26 Oct 2026, 12:21 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: High (CVSS 7.5)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor response not established. A vendor fix does not mean a deployment is fixed.

## Affected components
- npm email-existence: affected <= 0.1.6

## Suggested inspection (read-only)
- `npm ls email-existence --all`: lists every installed copy and version, including transitive ones. Run in the project root after `npm ci`.

## Supported action
No complete vendor fix is recorded. Follow the primary source's mitigation guidance and check this record again before closing anything.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on email-existence.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://osv.dev/vulnerability/GHSA-p27h-4cpf-fw48 (OSV record GHSA-p27h-4cpf-fw48 lists affected ranges: npm email-existence >=0 <=0.1.6)
- Verified: https://github.com/advisories/GHSA-p27h-4cpf-fw48 (GitHub-reviewed advisory GHSA-p27h-4cpf-fw48 lists affected ranges: npm email-existence >=0 <=0.1.6)

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