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Permalink CVE-2026-1979

5.3 MEDIUM

CVSS version: 3.1
Attack vector (AV):
Attack complexity (AC):
Privileges required (PR):
User interaction (UI):
Scope (S):
Confidentiality impact (C):
Integrity impact (I):
Availability impact (A):

created 2 months, 1 week ago Activity log

Created suggestion 2 months, 1 week ago

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.

References

VDB-344501 | mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free vdb-entrytechnical-description
VDB-344501 | CTI Indicators (IOB, IOC, IOA) signaturepermissions-required
Submit #743377 | mruby cda2567 Use After Free third-party-advisory
https://github.com/mruby/mruby/issues/6701 issue-tracking
https://github.com/mruby/mruby/issues/6701#issue-3802609843 exploitissue-tracking
https://github.com/sysfce2/mruby/commit/e50f15c1c6e131fa7934355eb02b8173b13df415 patch
https://github.com/mruby/mruby/ product

Affected products

mruby

==3.0
==3.1
==3.4.0
==3.3
==3.2

Matching in nixpkgs

pkgs.mruby

Embeddable implementation of the Ruby language

nixos-unstable 3.3.0
- nixpkgs-unstable 3.3.0
- nixos-unstable-small 3.3.0
nixos-25.11 3.3.0
- nixpkgs-25.11-darwin 3.3.0

Package maintainers

@nicknovitski Nick Novitski <nixpkgs@nicknovitski.com>

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