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TI-2021-03055 Aliases CVE-2021-4188GHSA-wc43-284g-pqr5

NULL Pointer Dereference in mruby/mruby

Priority LOW 35CWE-476Published · Updated

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
Fixed

Attack profile from CVSS 3.1 · NVD. Fix status from CNA. Impact type from CWE-476.

Summary

mruby is vulnerable to NULL Pointer Dereference

Why it matters now

EPSS 0.00884 59th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed mruby/mruby (mruby): 3.1

SSVC decision points

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

Affected products

VendorProductAffected versionsFixed inStatusSource
mrubymruby/mrubybefore 3.13.1Patch availableCNA
  • mruby/mruby Vendormruby Affected before 3.1 Fixed in 3.1 Patch available CNA

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:*up to 3.0.0Vulnerablemruby
  • cpe:2.3:a:mruby:mruby:*:*:*:*:*:*:*:* Versions up to 3.0.0 Vulnerable ·mruby

Remediation

  • Fix · CNA mruby/mruby (mruby) Fixed in 3.1

Timeline

  1. 2026-10-02 Threatist record created from CVE-2021-4188
  2. 2026-10-03 Alias added: GHSA-wc43-284g-pqr5

References

Exploit 1

Patch 1

  • 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

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences