TI-2018-08786 Aliases CVE-2018-12247 GHSA-8j6c-c99j-fh4c

An issue was discovered in mruby 1.4.1.

LOW 36CWE-476Published 2018-06-12 · Updated 2024-09-16

Key facts

Attack vector: Network
Privileges required: None
User interaction: None
Attack complexity: Low
Impact type: Denial of service
Confidentiality · integrity · availability: None · None · High
Fix status: No fix listed

Attack profile from CVSS 3.0 · NVD. Fix status from CNA. Impact type from CWE-476.

Summary

An issue was discovered in mruby 1.4.1. There is a NULL pointer dereference in mrb_class, related to certain .clone usage, because mrb_obj_clone in kernel.c copies flags other than the MRB_FLAG_IS_FROZEN flag (e.g., the embedded flag).

Why it matters now

EPSS 0.01486 74th percentileScored 2026-11-07

Fix No fix listed No fixed version in the sources yet

SSVC decision points

Not available: CISA has not published SSVC decision points for this record.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
—	—	all versions	—	No fix listed	CNA

— Vendor— Affected all versions Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:mruby:mruby:1.4.1:::::::*	1.4.1	Vulnerable	mruby

cpe:2.3:a:mruby:mruby:1.4.1:*:*:*:*:*:*:* Versions 1.4.1 Vulnerable ·mruby

Remediation

No fixed version listed by the sources yet.

Timeline

2026-10-02 Threatist record created from CVE-2018-12247
2026-10-03 Alias added: GHSA-8j6c-c99j-fh4c

References

Patch 1

https://github.com/mruby/mruby/commit/55edae0226409de25e59922807cb09acb45731a2

Advisory 1

https://github.com/mruby/mruby/issues/4036

TI-2022-00033 Heap-based Buffer Overflow in mruby/mruby CVSS 3.1CRITICAL 9.8
TI-2026-01636 mruby JMPNOT-to-JMPIF Optimization vm.c mrb_vm_exec use after free CVSS 4.0MEDIUM 4.8
TI-2025-11794 mruby array.c ary_fill_exec out-of-bounds write CVSS 4.0MEDIUM 4.8
TI-2025-06567 mruby nregs codegen.c scope_new heap-based overflow CVSS 4.0MEDIUM 4.8
TI-2018-07224 In versions of mruby up to and including 1.4.0, an integer overflow exists in… CVSS 3.1CRITICAL 9.8
TI-2022-01100 Use-After-Free in str_escape in mruby/mruby in mruby/mruby CVSS 3.1CRITICAL 9.8

See all 41 →

Sources

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