CVE-2026-78847 Code injection in n/a
Attackers can execute arbitrary code via JavaScript injection in front matter parsing due to unsafe eval usage in the gray-matter library.
- 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-2026-78847?
CVE-2026-78847 is a critical code injection vulnerability in n/a, published on 21 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
An issue in gray-matter All versions (verified on 4.0.3) allows the JavaScript engine in lib/engines.js using eval() to parse front matter when language is js/javascript.This allows arbitrary code execution.
Weakness: CWE-95
Which versions are affected by CVE-2026-78847?
How do I fix CVE-2026-78847?
No fix has been published for CVE-2026-78847 yet. Limit exposure of the affected software until one is available.
Upgrade, and never evaluate templates, expressions or code built from user input. More about Code injection.
Is CVE-2026-78847 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-78847 exists.
Sources
Also known as GHSA-j9gx-vjm3-jpmm.