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4.8 Medium

CVE-2026-1979 A flaw has been found in mruby up to 3.4.0

Description

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.

Affected products and versions

Product Affected versions Fixed in
mruby 3.4.0 No fix stated
mruby 3.3 No fix stated
mruby 3.2 No fix stated
mruby 3.1 No fix stated
mruby 3.0 No fix stated

Other CVEs of mruby

The 5 CVEs of mruby →
CVE-2022-4996 A flaw has been found in mruby 3.1.0 6.9 Medium CVE-2025-13120 A vulnerability has been found in mruby up to 3.4.0 4.8 Medium CVE-2025-12875 A weakness has been identified in mruby 3.4.0 4.8 Medium CVE-2025-7207 A vulnerability, which was classified as problematic, was found in mruby up to 3.4.0-rc2 4.8 Medium
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