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mruby

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.

CVE-2026-1979 is a use-after-free vulnerability discovered in the mruby interpreter, a lightweight Ruby implementation used in embedded systems and applications requiring a small footprint. The vulnerability resides in the mrb_vm_exec function within the src/vm.c file, specifically in the JMPNOT-to-JMPIF optimization logic. This flaw allows an attacker with local access and limited privileges to manipulate the virtual machine's execution flow, triggering a use-after-free condition. Use-after-free vulnerabilities occur when a program continues to use memory after it has been freed, leading to undefined behavior such as memory corruption, crashes, or potential code execution. The vulnerability does not require user interaction but does require local access and privileges, which limits the attack surface primarily to insiders or compromised accounts. The vulnerability affects all mruby versions up to and including 3.4.0. The issue has been assigned a CVSS 4.8 (medium) score, reflecting the need for local privileges but the potential for significant impact on confidentiality, integrity, and availability. A patch has been released (commit e50f15c1c6e131fa7934355eb02b8173b13df415) to fix the flaw by correcting the memory management in the affected function. While an exploit has been published, there are no confirmed reports of active exploitation in the wild. The vulnerability is particularly relevant for organizations embedding mruby in their products or development environments, as exploitation could lead to application crashes or potentially escalate privileges if combined with other vulnerabilities.

Detailed information about CVE-2026-1979: Use After Free in mruby affecting null mruby. Get real-time updates, technical details, and mitigation strategies.

CVE-2026-1979: Use After Free in mruby - Live Threat Intelligence - Threat Radar | OffSeq.com

CVE-2026-1979: Use After Free in mruby

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