CVE-2026-1979— mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free
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I. Basic Information for CVE-2026-1979
Vulnerability Information
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Vulnerability Title
mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L
Source: NVD (National Vulnerability Database)
Vulnerability Type
释放后使用
Source: NVD (National Vulnerability Database)
Vulnerability Title
mruby 资源管理错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
mruby是makesoftwaresafe开源的一款Ruby语言的轻量级实现。 mruby 3.4.0及之前版本存在资源管理错误漏洞，该漏洞源于JMPNOT-to-JMPIF Optimization组件中src/vm.c文件的mrb_vm_exec函数存在缺陷，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)
Affected Products
| Vendor | Product | Affected Versions | CPE | Subscribe |
|---|---|---|---|---|
| - | mruby | 3.0 | cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:* |
II. Public POCs for CVE-2026-1979
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|---|
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Same Patch Batch · n/a · 2026-02-06 · 10 CVEs total
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| CVE-2026-1976 | 5.3 MEDIUM | Free5GC SMF SessionDeletionResponse null pointer dereference |
| CVE-2026-1975 | 5.3 MEDIUM | Free5GC pfcp_reports.go identityTriggerType null pointer dereference |
| CVE-2026-1974 | 5.3 MEDIUM | Free5GC SMF datapath.go ResolveNodeIdToIp denial of service |
| CVE-2026-1973 | 5.3 MEDIUM | Free5GC SMF establishPfcpSession null pointer dereference |
| CVE-2026-1998 | 3.3 LOW | micropython runtime.c mp_import_all memory corruption |
| CVE-2026-1991 | 3.3 LOW | libuvc UVC Descriptor device.c uvc_scan_streaming null pointer dereference |
| CVE-2026-1990 | 3.3 LOW | oatpp Type.hpp ObjectWrapper null pointer dereference |
| CVE-2025-70963 | GoPhish 安全漏洞 |
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V. Comments for CVE-2026-1979
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