CVE-2026-1979

LOW EPSS 4.9%
Published Feb 6, 20264mo ago · Modified Jun 17, 20261w ago
1.9 CVSS 4.0
Low
Find Similar
Published Feb 6, 2026 4mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
1.9
Exploitability
—
Impact
—
Vector string
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/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope X

Threat Intelligence

EPSS Exploit Probability
4.9% percentile
Exploit & Patch Status
Public Exploit Known
Patch Available

Weaknesses 2

CWE-119 Improper Restriction of Operations within the Bounds of a Memory Buffer Memory Safety
CWE-416 Use After Free Memory Safety

Affected Products 1

VendorProductVersionRange
mrubymruby* ≤3.4.0

References 7

  • github.com https://github.com/mruby/mruby/
    Product
  • github.com https://github.com/mruby/mruby/issues/6701
    ExploitIssue Tracking
  • github.com https://github.com/mruby/mruby/issues/6701#issue-3802609843
    ExploitIssue Tracking
  • github.com https://github.com/sysfce2/mruby/commit/e50f15c1c6e131fa7934355eb02b8173b13df415
    Patch
  • vuldb.com https://vuldb.com/?ctiid.344501
    Permissions RequiredVDB Entry
  • vuldb.com https://vuldb.com/?id.344501
    Third Party AdvisoryVDB Entry
  • vuldb.com https://vuldb.com/?submit.743377
    Third Party AdvisoryVDB Entry

Remediation

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