CVE-2026-1979

medium

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.

References

https://vuldb.com/?submit.743377

https://vuldb.com/?id.344501

https://vuldb.com/?ctiid.344501

https://github.com/sysfce2/mruby/commit/e50f15c1c6e131fa7934355eb02b8173b13df415

https://github.com/mruby/mruby/issues/6701#issue-3802609843

https://github.com/mruby/mruby/issues/6701

https://github.com/mruby/mruby/

Details

Source: Mitre, NVD

Published: 2026-02-06

Updated: 2026-02-06

Risk Information

CVSS v2

Base Score: 4.3

Vector: CVSS2#AV:L/AC:L/Au:S/C:P/I:P/A:P

Severity: Medium

CVSS v3

Base Score: 5.3

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

Severity: Medium

CVSS v4

Base Score: 4.8

Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:L/VA:L/SC:N/SI:N/SA:N

Severity: Medium

EPSS

EPSS: 0.00013