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CVE-2021-27515: Path traversal in url-parse

May 6, 2021 (updated February 3, 2026)

url-parse before 1.5.0 mishandles certain uses of backslash such as http:/ and interprets the URI as a relative path.

References

  • advisory.checkmarx.net/advisory/CX-2021-4306
  • github.com/advisories/GHSA-9m6j-fcg5-2442
  • github.com/github/advisory-database/pull/6763
  • github.com/unshiftio/url-parse
  • github.com/unshiftio/url-parse/commit/d1e7e8822f26e8a49794b757123b51386325b2b0
  • github.com/unshiftio/url-parse/compare/1.4.7...1.5.0
  • github.com/unshiftio/url-parse/pull/197
  • lists.debian.org/debian-lts-announce/2023/02/msg00030.html
  • nvd.nist.gov/vuln/detail/CVE-2021-27515

Code Behaviors & Features

Detect and mitigate CVE-2021-27515 with GitLab Dependency Scanning

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Affected versions

All versions starting from 0.1.0 before 1.5.0

Fixed versions

  • 1.5.0

Solution

Upgrade to version 1.5.0 or above.

Impact 5.3 MEDIUM

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N

Learn more about CVSS

Weakness

  • CWE-23: Relative Path Traversal

Source file

npm/url-parse/CVE-2021-27515.yml

Spotted a mistake? Edit the file on GitLab.

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