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 (7)
Core 7
Core References
Various Sources product
https://github.com/mruby/mruby/
Permissions Required, VDB Entry vdb-entry
technical-description
https://vuldb.com/?id.344501
Permissions Required, VDB Entry signature
permissions-required
https://vuldb.com/?ctiid.344501
Permissions Required, VDB Entry third-party-advisory
https://vuldb.com/?submit.743377
Issue Tracking issue-tracking
https://github.com/mruby/mruby/issues/6701
Issue Tracking exploit
issue-tracking
https://github.com/mruby/mruby/issues/6701#issue-3802609843
Scores
CVSS v3
5.3
EPSS
0.0003
EPSS Percentile
7.5%
Attack Vector
LOCAL
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
CISA SSVC
Vulnrichment
Exploitation
poc
Automatable
no
Technical Impact
partial
Details
CWE
CWE-119
CWE-416
Status
published
Products (1)
mruby/mruby
< 3.4.0
Published
Feb 06, 2026
Tracked Since
Feb 18, 2026