Vulnerability 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 Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Mruby | Mruby | <= 3.4.0 |
Related Weaknesses (CWE)
References
- https://github.com/mruby/mruby/Product
- https://github.com/mruby/mruby/issues/6701ExploitIssue Tracking
- https://github.com/mruby/mruby/issues/6701#issue-3802609843ExploitIssue Tracking
- https://github.com/sysfce2/mruby/commit/e50f15c1c6e131fa7934355eb02b8173b13df415Patch
- https://vuldb.com/?ctiid.344501Permissions RequiredVDB Entry
- https://vuldb.com/?id.344501Third Party AdvisoryVDB Entry
- https://vuldb.com/?submit.743377Third Party AdvisoryVDB Entry
FAQ
What is CVE-2026-1979?
CVE-2026-1979 is a vulnerability with a CVSS score of 5.3 (MEDIUM). 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 fre...
How severe is CVE-2026-1979?
CVE-2026-1979 has been rated MEDIUM with a CVSS base score of 5.3/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2026-1979?
Check the references section above for vendor advisories and patch information. Affected products include: Mruby Mruby.