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CVE-2026-1774: CASL Ability is Vulnerable to Prototype Pollution

February 10, 2026 (updated February 11, 2026)

CASL Ability, versions 2.4.0 through 6.7.4, contains a prototype pollution vulnerability.

References

  • cwe.mitre.org/data/definitions/1321.html
  • developer.mozilla.org/en-US/docs/Web/Security/Attacks/Prototype_pollution
  • github.com/advisories/GHSA-x9vf-53q3-cvx6
  • github.com/stalniy/casl
  • github.com/stalniy/casl/commit/39da920ec1dfadf3655e28bd0389e960ac6871f4
  • github.com/stalniy/casl/pull/1093
  • github.com/stalniy/casl/tree/master/packages/casl-ability
  • nvd.nist.gov/vuln/detail/CVE-2026-1774
  • www.kb.cert.org/vuls/id/458422

Code Behaviors & Features

Detect and mitigate CVE-2026-1774 with GitLab Dependency Scanning

Secure your software supply chain by verifying that all open source dependencies used in your projects contain no disclosed vulnerabilities. Dependency Scanning using SBOM also detects vulnerabilities from proprietary advisories that this site does not include. Learn more about Dependency Scanning using SBOM →

Affected versions

All versions starting from 2.4.0 before 6.7.5

Fixed versions

  • 6.7.5

Solution

Upgrade to version 6.7.5 or above.

Impact 9.8 CRITICAL

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

Learn more about CVSS

Weakness

  • CWE-1321: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')

Source file

npm/@casl/ability/CVE-2026-1774.yml

Spotted a mistake? Edit the file on GitLab.

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