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CVE-2026-1979

MEDIUM

5.3

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.

CVE Details

CVSS v3.1 Score5.3

SeverityMEDIUM

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

Attack VectorLOCAL

ComplexityLOW

Privileges RequiredLOW

User InteractionNONE

Published2/6/2026

Last Modified2/28/2026

Sourcenvd

Honeypot Sightings0

Affected Products

mruby:mruby

Weaknesses (CWE)

CWE-119CWE-416

References

https://github.com/mruby/mruby/(cna@vuldb.com)

https://github.com/mruby/mruby/issues/6701(cna@vuldb.com)

https://github.com/mruby/mruby/issues/6701#issue-3802609843(cna@vuldb.com)

https://github.com/sysfce2/mruby/commit/e50f15c1c6e131fa7934355eb02b8173b13df415(cna@vuldb.com)

https://vuldb.com/?ctiid.344501(cna@vuldb.com)

https://vuldb.com/?id.344501(cna@vuldb.com)

https://vuldb.com/?submit.743377(cna@vuldb.com)

IOC Correlations

No correlations recorded

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