CVE-2026-106550 CVE-2026-106550
An attacker can cause persistent application failures by exploiting prototype pollution in Node-convict to overwrite core JavaScript methods.
- 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-2026-106550?
CVE-2026-106550 is a high-severity denial of service vulnerability in Mozilla Node-convict, published on 6 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
Mozilla's Node-convict (version 6.2.2 and later) is vulnerable to a Denial of Service vulnerability caused by incomplete prototype‑pollution protections in config.set(). An attacker controlling the configuration key can write arbitrary properties to constructor.<key>, which walk() resolves to the global Object function. This allows overwriting core JavaScript methods such as Object.assign, leading to persistent process-wide failures and requiring a restart. The issue bypasses existing filters that only block constructor.prototype.* and __proto__.*. Exploitation requires an endpoint that forwards attacker-controlled keys into config.set().
Which versions are affected by CVE-2026-106550?
How do I fix CVE-2026-106550?
No fix has been published for CVE-2026-106550 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2026-106550 being exploited?
There is no known exploitation of CVE-2026-106550 in the wild and no public exploit code.
Sources
Also known as GHSA-37q3-7h5g-p75h.