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📦 npm
Not in CISA KEV
HIGH severity

CVE-2018-25079 — is-url

HIGHFix: segmentio/is-url@1495509

CVE-2018-25079 is a high-severity (CVSS 7.5) CWE-1333 vulnerability in is-url. A fix is available for is-url — see the affected versions and patch details below.

is-url Inefficient Regular Expression Complexity vulnerability

Also known asGHSA-p9w8-2mpq-49h9
Published
Updated
Affected
1 pkg
Patched
1 / 1
Exploits
None indexed
Exploitation data as of Nov 5, 2026 · OSV.dev, NVD, FIRST.org (EPSS)

EPSS Exploitation Probability

via FIRST.org ↗
1.0%probability of exploitation in next 30 days
Lower Risk0.00%
Lower risk than most CVEs61th percentile — riskier than 61% of all scored CVEsHighest risk
0.00%0.48%0.97%1.45%0.5%1.0%May 26Sep 26Nov 26

Probability of exploitation in the next 30 days, from FIRST.org EPSS.

How urgent is this, really

Where this sits among everything scored

Real-World Exposure

1 pkg affected

How broadly this vulnerability is actually deployed: weekly install volume shows current usage, and reverse-dependency count shows how many other packages break if it stays unpatched.

1Kother npm packages depend on this — each one inherits the vulnerability until it's patched upstream
is-urlnpm
25.1Mdownloads / week

Description

A vulnerability was found in Segmentio is-url up to 1.2.2. 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 attack may be launched remotely. Upgrading to version 1.2.3 is able to address this issue. The patch is identified as 149550935c63a98c11f27f694a7c4a9479e53794. It is recommended to upgrade the affected component. VDB-220058 is the identifier assigned to this vulnerability.

Affected Packages

1 total 1 fixed
EcosystemPackageVulnerable rangeFix
📦npmis-urlall versions1.2.3npm install is-url@1.2.3

Affected Products

1 product · 1 configurations
Application
is-urlsegment
≤ 1.2.2
range

Detection & mitigation playbook

Open-source dependency

  1. Detect

    Scan your dependency tree (package-lock.json, pnpm-lock.yaml, requirements.txt, go.sum, etc.) for is-url, including transitive dependencies — a direct dependency you never call can still pull in a vulnerable version.

  2. Fix

    Update is-url to 1.2.3 or later, then make sure no transitive (indirect) dependency still pins the vulnerable range — O3 confirms CVE-2018-25079 is resolved across your whole dependency graph.

  3. Workarounds

    If you can't upgrade right away: gate or disable the affected feature, validate untrusted input at the boundary, and avoid passing attacker-controlled data into the vulnerable path. O3's runtime protection blocks exploitation in production as an interim safeguard until the upgrade lands.

Frequently Asked Questions

A vulnerability was found in Segmentio is-url up to 1.2.2. It has been rated as problematic. Affected by this issue is an unknown functionality of the file index.js. The manipulation leads to inefficient regular expression complexity. The attack may be launched remotely. Upgrading to version 1.2.3 is able to address this issue. The name of the patch is 149550935c63a98c11f27f694a7c4a9479e53794. It is recommended to upgrade the affected component. VDB-220058 is the identifier assigned to this vulnerability.
O3 Security · Impact-Aware SCA

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CVE-2018-25079: is-url — Fixed in 1.2.3