Vulnerability · Published Nov 19, 2025 · Assigned by VulDB

CVE-2025-13397mrubyc alloc.c mrbc_raw_realloc null pointer dereference

Low 3.3

In plain English

A low-severity null pointer dereference in mrubyc. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 5% of all known vulnerabilities).

Severity (CVSS 3.1)3.3Low

Exploit odds (30 days)0.2%top 95.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

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.

Affected products (as reported)

Vendor	Product	Versions
n/a	mrubyc	3.03.13.23.33.4

Weakness: CWE-476, CWE-404 · Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:L/E:X/RL:O/RC:C

References

VDB-332925 | mrubyc alloc.c mrbc_raw_realloc null pointer dereference vdb-entry, technical-description
VDB-332925 | CTI Indicators (IOB, IOC, IOA) signature, permissions-required
Submit #692130 | mrubyc 3.4 NULL Pointer Dereference third-party-advisory
https://github.com/mrubyc/mrubyc/issues/244 issue-tracking
https://github.com/mrubyc/mrubyc/issues/244#issuecomment-3400382026 issue-tracking
https://github.com/mrubyc/mrubyc/commit/009111904807b8567262036bf45297c3da8f1c87 patch