MEDIUM 5.3 Microsoft

CVE-2026-1979

mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free

Microsoft Security Update 2026-Feb: mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free

Affected Products

azl3 nghttp2 1.61.0-2 on Azure Linux 3.0
azl3 rust 1.75.0-24 on Azure Linux 3.0
cbl2 nghttp2 1.57.0-2 on CBL Mariner 2.0
azl3 rust 1.90.0-3 on Azure Linux 3.0
cbl2 rust 1.72.0-13 on CBL Mariner 2.0

References

https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-1979
https://nvd.nist.gov/vuln/detail/CVE-2026-1979

Published: 2026-02-10 · Source: Microsoft · Feed updated: 2026-08-20

This medium severity vulnerability with a CVSS score of 5.3 was published on 2026-02-10 via Microsoft. Affected: azl3 nghttp2 1.61.0-2 on Azure Linux 3.0, azl3 rust 1.75.0-24 on Azure Linux 3.0, cbl2 nghttp2 1.57.0-2 on CBL Mariner 2.0 and 2 more.

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