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    CVE-2026-1979: mruby VM Use-After-Free from faulty JMPNOT optimization

    A recently assigned CVE, CVE‑2026‑1979, exposes a use‑after‑free (UAF) in mruby’s virtual machine caused by an over‑aggressive bytecode optimization that converts JMPNOT instructions into JMPIF instructions — a logic error that corrupts compiled bytecode and can lead to memory corruption when...
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    • bytecode optimization embedded systems mruby note: only 4 allowed vulnerability
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    • Forum: Security Alerts
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    MRuby CVE-2025-7207 Fixed: Initialize nregs to Prevent Heap Overflow

    A subtle lapse in compiler bookkeeping has left mruby — the lightweight, embeddable Ruby implementation used widely in embedded systems and constrained environments — exposed to a heap-based buffer overflow in its code generator: CVE-2025-7207 affects the nregs handler in...
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