CVE-2026-1979
mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free
Summary
mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free
Original description
The description as published by the source.
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.
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-1979 mruby
- Ubuntu UBUNTU-CVE-2026-1979 mruby
References
- advisory github.com
- advisory nvd.nist.gov
- advisory vuldb.com
- advisory vuldb.com
- patch github.com
- report github.com
- report github.com
- report vuldb.com
- web github.com