CVE-2026-16266 Other in mongo-object
Prototype pollution in mongo-object allows attackers to modify the JavaScript prototype chain, potentially leading to code execution or privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-16266?
CVE-2026-16266 is a medium-severity vulnerability in mongo-object, published on 21 Jul 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Versions of the package mongo-object before 3.0.3 are vulnerable to Prototype Pollution via the expandKey() function in util.js. An attacker can modify the JavaScript prototype chain by supplying a crafted property path containing special keys such as __proto__.
Weakness: CWE-1321
Which versions are affected by CVE-2026-16266?
How do I fix CVE-2026-16266?
No fix has been published for CVE-2026-16266 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-16266 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-16266 exists.
Sources
Also known as GHSA-c8xx-jpr5-7m25.