CVE-2025-13120
MediumCVSS 5.3Exploitation Probability (EPSS)
Low risk5th percentile - higher than 5% of all known CVEs
Summary
In mruby up to 3.4.0, the sort_cmp function in src/array.c contains a use-after-free vulnerability that can be exploited locally. The exploit has been publicly disclosed.
Risk Assessment
A local attacker could exploit this to execute unauthorized code or cause a denial of service, potentially impacting confidentiality, integrity, and availability.
Recommendation
Apply patch eb398971bfb43c38db3e04528b68ac9a7ce509bc or update mruby to a version containing the fix.
Other vulnerabilities in mruby
See all- CVE-2017-9527High
The mark_context_stack function in gc.c in mruby through 1.2.0 allows attackers to cause a denial of service (heap-based use-after-free and application crash) or possibly have unspecified other impact via a crafted .rb file.
- CVE-2026-79590Medium
A NULL pointer dereference vulnerability exists in the Prism parser component of mruby 4.0.0. An attacker can provide a specially crafted Ruby source file that triggers the parser to pass a NULL pointer to string handling functions, resulting in undefined behavior and application crash.
- CVE-2022-4996Medium
A flaw has been found in mruby 3.1.0. The function udiv in bigint.c is affected. Executing a manipulation can lead to floating point comparison with incorrect operator. The attack can be launched remotely, and the exploit has been published.
- CVE-2025-12875Medium
A weakness has been identified in mruby 3.4.0 affecting the ary_fill_exec function in mrbgems/mruby-array-ext/src/array.c. Manipulating the start/length arguments can lead to an out-of-bounds write. The attack requires local access, the exploit is publicly available, and the fix is commit 93619f06dd378db6766666b30c08978311c7ec94.
Original NVD description (English source)
A vulnerability has been found in mruby up to 3.4.0. This vulnerability affects the function sort_cmp of the file src/array.c. Such manipulation leads to use after free. An attack has to be approached locally. The exploit has been disclosed to the public and may be used. The name of the patch is eb398971bfb43c38db3e04528b68ac9a7ce509bc. It is advisable to implement a patch to correct this issue.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS