CVE-2026-111172 @casl/ability 6.7.5 before 7.0.2 Prototype Pollution via rulesToFields setByPath
Attackers can cause denial of service in Node.js applications by exploiting prototype pollution in the @casl/ability library via crafted rule conditions.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-111172?
CVE-2026-111172 is a medium-severity vulnerability in stalniy @casl/ability, published on 15 Oct 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official 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.
Weakness: CWE-1321
Which versions are affected by CVE-2026-111172?
How do I fix CVE-2026-111172?
No fix has been published for CVE-2026-111172 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-111172 being exploited?
There is no known exploitation of CVE-2026-111172 in the wild and no public exploit code.
Sources
Also known as GHSA-6vwj-298m-4jg8.