CVE-2026-46509 deepobj: Improperly Controlled Modification of Object Prototype Attributes ('Prototype Pollution')
Prototype pollution in deepobj allows attackers to modify object prototypes via crafted property paths, 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
- Available
What is CVE-2026-46509?
CVE-2026-46509 is a high-severity code injection vulnerability in ranfdev deepobj, published on 28 May 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
deepobj provides get, set, delete deep objects in javascript. Prior to 1.0.3, prototype pollution is possible when property paths contain __proto__/constructor/prototype. The property path must not be exposed as user input. This vulnerability is fixed in 1.0.3.
Weakness: CWE-1321
Which versions are affected by CVE-2026-46509?
2 open source packages ship an affected version, including @ranfdev/deepobj.
| Package | Affected | Fixed in |
|---|---|---|
@ranfdev/deepobj npm | All versions | 1.0.3 |
@ranfdev/deepobj npm | All versions | 1.0.3 |
How do I fix CVE-2026-46509?
Upgrade @ranfdev/deepobj to 1.0.3 or later.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-46509 being exploited?
There is no known exploitation of CVE-2026-46509 in the wild and no public exploit code.
Sources
Also known as GHSA-x7q7-fchv-8h2j.