Security readout for executives and security teams
Plain-English summary
This vulnerability affects the npm package Segmentio is-url versions 1.2.0 through 1.2.2. Crafted input can make the package's regular expression work inefficiently, potentially slowing an application that uses it. The cited CVSS score is 4.3, with low availability impact and no confidentiality or integrity impact.
Executive priority
Treat this as a moderate dependency hygiene issue. It is not described as data theft or remote code execution, but it can affect availability where vulnerable versions process untrusted input. Prioritize normal patch cycles, faster for internet-facing services.
Technical view
CVE-2018-25079 is CWE-1333, inefficient regular expression complexity, in index.js of segmentio/is-url. The CVSS 3.1 vector is AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L. Sources identify version 1.2.3 and commit 149550935c63a98c11f27f694a7c4a9479e53794 as the patch.
Likely exposure
Exposure is most likely in Node.js applications that directly or transitively depend on segmentio/is-url versions 1.2.0, 1.2.1, or 1.2.2, especially where URL-like user input reaches this validator.
Exploitation context
The source bundle says the attack may be launched remotely, but the CVSS vector requires low privileges. The CVE is not listed as KEV in the bundle, and no cited source confirms active exploitation.
Researcher notes
Evidence identifies the affected package, vulnerable versions, CWE, CVSS vector, and patch. The bundle does not name specific downstream products, proof-of-concept status, or confirmed exploitation, so exposure assessment depends on local dependency and data-flow review.
Mitigation direction
- Upgrade segmentio/is-url to version 1.2.3 or later.
- Regenerate lockfiles so transitive dependency resolution actually changes.
- Redeploy affected services after dependency updates are verified.
- If upgrade is delayed, reduce untrusted input paths using this validator.
- Monitor affected services for latency spikes or availability degradation.
Validation and detection
- Search package manifests, lockfiles, and SBOMs for segmentio/is-url.
- Confirm no deployed artifact resolves is-url to 1.2.0, 1.2.1, or 1.2.2.
- Identify routes or jobs that pass user-controlled strings into URL validation.
- Verify the deployed dependency includes the referenced patched release or commit.
- Check dependency scanners after lockfile updates and redeployment.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
Use these exact CWE pages and searches to review the Glexia ATT&CK library from this CVE's weakness and description context.
CWE-1333: Exact CWE lookup
Use the exact CWE identifier as the starting point before reviewing related ATT&CK behavior. Open the exact CWE lookup page first, then review the ATT&CK searches from that MITRE weakness context. This is a Glexia lookup hint, not an official ATT&CK mapping.
Open ATT&CK lookupCVE-2018-25079 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Medium
- CVSS
- 4.3 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L2.81.4Primary CVE scoreVulnerability scoring details
Base CVSS 3.1 score
4.3MediumVector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L
Source materials
- CVE List V5 sourceCVE List V5
- https://vuldb.com/?id.220058CVE reference · vdb-entry
- https://vuldb.com/?ctiid.220058CVE reference · signature, permissions-required
- https://github.com/segmentio/is-url/pull/18CVE reference · issue-tracking
- https://github.com/segmentio/is-url/commit/149550935c63a98c11f27f694a7c4a9479e53794CVE reference · patch
- https://github.com/segmentio/is-url/releases/tag/v1.2.3CVE reference · patch
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.
Inefficient Regular Expression Complexity
Inefficient Regular Expression Complexity represents a recurring weakness pattern that can create exploitable paths when design, validation, or implementation controls are missing.