CVE-2026-1979

5.3 MEDIUM
Published: February 06, 2026 Modified: February 28, 2026
View on NVD

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.

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CVSS v3.x Details

0.0 Low Medium High Critical 10.0
Vector String
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L

References to Advisories, Solutions, and Tools

Patch Vendor Advisory Exploit Third Party Advisory
https://github.com/mruby/mruby/
Source: cna@vuldb.com
Product
https://github.com/mruby/mruby/issues/6701
Source: cna@vuldb.com
Exploit Issue Tracking
https://github.com/mruby/mruby/issues/6701#issue-3802609843
Source: cna@vuldb.com
Exploit Issue Tracking
https://vuldb.com/?ctiid.344501
Source: cna@vuldb.com
Permissions Required VDB Entry
https://vuldb.com/?id.344501
Source: cna@vuldb.com
Third Party Advisory VDB Entry
https://vuldb.com/?submit.743377
Source: cna@vuldb.com
Third Party Advisory VDB Entry

7 reference(s) from NVD

Quick Stats

CVSS v3 Score
5.3 / 10.0
EPSS (Exploit Probability)
0.0%
6th percentile
Exploitation Status
Not in CISA KEV

Weaknesses (CWE)

Affected Vendors

mruby