NULL Pointer Dereference in mrubyc Affects Multiple Versions
CVE-2026-38976

7.5HIGH

Key Information:

Vendor

mrubyc

Status
mrubyc
Vendor
CVE Published:
6 July 2026

What is CVE-2026-38976?

The mrubyc version 3.4.1 and earlier contains a vulnerability due to a NULL pointer dereference that occurs in the function op_super() within src/vm.c. This flaw arises from the absence of a necessary runtime guard for top-level super, which could lead to unexpected behavior and potential system instability. Developers utilizing the mruby C implementations should take immediate action to address this issue and update their software to mitigate against potential exploits.

References

https://github.com/mrubyc/mrubyc/issues/276
https://github.com/hayat01sh1da/mrubyc/commit/c4aa2a06bfd...
https://github.com/mrubyc/mrubyc

CVSS V3.1

Score:
7.5
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
None
Attack Vector:
Network
Attack Complexity:
Low
Privileges Required:
None
User Interaction:
None
Scope:
Unchanged

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.