CVE-2025-13397 mrubyc alloc.c mrbc_raw_realloc null pointer dereference
A local attacker can cause a denial of service in mrubyc via a null pointer dereference in the memory reallocation function.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Local or same network only
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2025-13397?
CVE-2025-13397 is a medium-severity vulnerability in mrubyc, published on 19 Nov 2025. It can only be exploited from the same machine or local network, with no action from the victim.
Official description
A security vulnerability has been detected in mrubyc up to 3.4. This impacts the function mrbc_raw_realloc of the file src/alloc.c. Such manipulation of the argument ptr leads to null pointer dereference. An attack has to be approached locally. The name of the patch is 009111904807b8567262036bf45297c3da8f1c87. It is advisable to implement a patch to correct this issue.
Which versions are affected by CVE-2025-13397?
It affects 1 product.
Products include S-Itoc Mruby\/C.
How do I fix CVE-2025-13397?
No fix has been published for CVE-2025-13397 yet. Limit exposure of the affected software until one is available.
Is CVE-2025-13397 being exploited?
There is no known exploitation of CVE-2025-13397 in the wild and no public exploit code.
Sources
Also known as GHSA-99jr-qh2r-jwfm.