CVE-2026-111172: Prototype Pollution (CVSS 5.3)

Description

@casl/ability 6.7.5 before 7.0.2 contains a prototype pollution vulnerability in rulesToFields() that allows attackers to modify inherited builtins via dotted condition keys. Attackers controlling rule conditions can supply keys like 'toString.call' to alter shared builtin functions process-wide, causing denial of service for the Node.js process.

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CVSS v3.1 Score

5.3

MEDIUM

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

Weakness Type (CWE)

CWE-1321 CWE-1321

References

Other References

https://github.com/stalniy/casl https://github.com/stalniy/casl/blob/80f2380d03cfe9b162685d510ba8bc0ce83d0598/packages/casl-ability/src/utils.ts#L11-L29 https://github.com/stalniy/casl/commit/58242cb3c7911c8a89bacfb7d732701d81bc1324 https://github.com/stalniy/casl/pull/1305 https://www.vulncheck.com/advisories/casl-ability-6.7.5-before-7.0.2-prototype-pollution-via-rulestofields-setbypath

Frequently Asked Questions

What is CVE-2026-111172? +

@casl/ability 6.7.5 before 7.0.2 contains a prototype pollution vulnerability in rulesToFields() that allows attackers to modify inherited builtins via dotted condition keys. Attackers controlling rule conditions can supply keys like 'toString.call' to alter shared builtin functions process-wide, causing denial of service for the Node.js process. It has a CVSS v3.1 base score of 5.3 (MEDIUM).

How severe is CVE-2026-111172? +

CVE-2026-111172 has a CVSS v3.1 score of 5.3 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

How do I check if I'm vulnerable to CVE-2026-111172? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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