Mruby Mruby vulnerabilities
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Published CVEs affecting Mruby Mruby: 3 record(s), with affected versions and fixes.cpe:2.3:a:mruby:mruby
CVE-2026-1979
Medium · 5.5
CWE-119 Feb 6, 2026
mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free
A flaw has been found in mruby up to 3.4.0. This affects the function mrb_vm_exec of the file src/vm.c of the component JMPNOT-to-JMPIF Optimization. Executing a manipulation can lead to use after free. The attack needs to be launched locally. The exploit has been published and may be used. This patch is called e50f15c1c6e131fa7934355eb02b8173b13df415. It is advisable to implement a patch to correct this issue.
CVE-2025-13120
Medium · 5.5
CWE-119 Nov 13, 2025
mruby array.c sort_cmp use after free
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.
CVE-2025-12875
High · 7.8
CWE-787 Nov 7, 2025
mruby array.c ary_fill_exec out-of-bounds write
A weakness has been identified in mruby 3.4.0. This vulnerability affects the function ary_fill_exec of the file mrbgems/mruby-array-ext/src/array.c. Executing a manipulation of the argument start/length can lead to out-of-bounds write. The attack needs to be launched locally. The exploit has been made available to the public and could be used for attacks. This patch is called 93619f06dd378db6766666b30c08978311c7ec94. It is best practice to apply a patch to resolve this issue.