CVE-2026-1979: mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free

Overview

Severity

Medium (CVSS 5.3)

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L/E:P/RL:O/RC:C

Exploit Status

Not Exploited

Patch Tuesday

2026-Feb

Released

2026-02-21

Last Updated

2026-03-03

EPSS Score

0.02% (percentile: 6.2%)

Affected Products (5)

Other

• 20318-17084
• 20864-17084
• 19774-17086
• 20865-17084
• 20879-17086

Revision History

• 2026-02-21: Information published.
• 2026-03-03: Information published.