CVE catalog

CVE-2026-1979

mruby: CVE-2026-1979

[CVE catalog]

Severity
Medium
Published
Source
[NVD] · [CVE record]
EPSS
0.18% · Oct 25, 2026

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.

Vulnerable and fixed packages

Distribution-reported package versions and fixes. These do not depend on matching against the OpenFactory package catalog.

DistributionPackageReleaseVersionStatus
Debianmrubysid4.0.0-1fixed
Debianmrubyforky4.0.0-1fixed
Debianmrubytrixie3.3.0-1vulnerable
Debianmrubybookworm3.1.0-3vulnerable

Fixed-version evidence

DistributionPackageTypeReleaseFixed versionUrgencyOriginBugs
Debianmrubysourcesid4.0.0-1not yet assignedNot reported[1127317]
Debianmrubysourceforky4.0.0-1not yet assignedNot reported[1127317]
Debianmrubysourcetrixie(unfixed)not yet assignedNot reported[1127317]
Debianmrubysourcebookworm(unfixed)not yet assignedNot reported[1127317]

[Debian bug #1127317]

Notes

[trixie] mruby: Minor issue [bookworm] mruby: Minor issue

OpenFactory catalog packages

[Debian 12 (Bookworm)]

  • [libmruby-dev]Affected

    Source package: [mruby]

    Details (2)

    • 3.1.0-3 · amd64 · bookworm

      Affected

      dsa · mruby · debian · bookworm; dsa · mruby · debian · 12

    • 3.1.0-3 · arm64 · bookworm

      Affected

      dsa · mruby · debian · bookworm; dsa · mruby · debian · 12

  • [mruby]Affected
    Details (2)

    • 3.1.0-3 · amd64 · bookworm

      Affected

      dsa · mruby · debian · bookworm; dsa · mruby · debian · 12

    • 3.1.0-3 · arm64 · bookworm

      Affected

      dsa · mruby · debian · bookworm; dsa · mruby · debian · 12

[Debian 13 (Trixie)]

  • [libmruby-dev]Affected

    Source package: [mruby]

    Details (2)

    • 3.3.0-1 · amd64 · trixie

      Affected

      dsa · mruby · debian · 13

    • 3.3.0-1+b1 · arm64 · trixie

      Affected

      dsa · mruby · debian · 13

  • [mruby]Affected

    Source package: [mruby]

    Details (2)

    • 3.3.0-1 · amd64 · trixie

      Affected

      dsa · mruby · debian · 13

    • 3.3.0-1+b1 · arm64 · trixie

      Affected

      dsa · mruby · debian · 13

Observed:

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database]