CVE-2026-1979

MEDIUM
2026-02-06 [email protected]
5.3
CVSS 3.1
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CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
Low
Availability
Low

Lifecycle Timeline

4
Analysis Generated
Mar 12, 2026 - 21:54 vuln.today
PoC Detected
Feb 28, 2026 - 00:33 vuln.today
Public exploit code
Patch Released
Feb 28, 2026 - 00:33 nvd
Patch available
CVE Published
Feb 06, 2026 - 05:16 nvd
MEDIUM 5.3

Tags

Ruby Use After Free Mruby Suse

Description

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.

Analysis

Use-after-free memory corruption in mruby up to version 3.4.0 within the JMPNOT-to-JMPIF optimization logic allows local attackers with user-level privileges to corrupt memory and potentially execute arbitrary code. Public exploit code exists for this vulnerability, and a patch is available. …

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Remediation

Within 30 days: Identify affected systems running mruby and apply vendor patches as part of regular patch cycle. Vendor patch is available.

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Priority Score

47
Low Medium High Critical
KEV: 0
EPSS: +0.0
CVSS: +26
POC: +20

Vendor Status

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CVE-2026-1979 vulnerability details – vuln.today
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