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2 vulnerabilities by mrubyc
CVE-2026-86547 (GCVE-0-2026-86547)
Vulnerability from nvd – Published: 2026-09-09 10:07 – Updated: 2026-09-09 12:41
VLAI
EPSS
VEX
Title
mrubyc through 4.0.0 NULL Pointer Dereference via OP_ENTER
Summary
mrubyc through 4.0.0 contains a null pointer dereference vulnerability in the op_enter() handler in src/vm.c when processing untrusted bytecode. Attackers can craft malicious .mrb bytecode files with OP_ENTER instructions at the top level to crash the embedding application and cause denial of service.
Severity
6.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 12:41 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/mrubyc/mrubyc/blob/release4.0.… | technical-description |
| https://github.com/mrubyc/mrubyc/blob/4261cf5e5ae… | technical-description |
| https://www.vulncheck.com/advisories/mrubyc-throu… | third-party-advisory |
Date Public
2026-09-07 00:00
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CVE-2026-86547 (GCVE-0-2026-86547)
Vulnerability from cvelistv5 – Published: 2026-09-09 10:07 – Updated: 2026-09-09 12:41
VLAI
EPSS
VEX
Title
mrubyc through 4.0.0 NULL Pointer Dereference via OP_ENTER
Summary
mrubyc through 4.0.0 contains a null pointer dereference vulnerability in the op_enter() handler in src/vm.c when processing untrusted bytecode. Attackers can craft malicious .mrb bytecode files with OP_ENTER instructions at the top level to crash the embedding application and cause denial of service.
Severity
6.2 (Medium)
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-09 12:41 UTC
CWE
- CWE-476 - NULL Pointer Dereference
Assigner
References
3 references
| URL | Tags |
|---|---|
| https://github.com/mrubyc/mrubyc/blob/release4.0.… | technical-description |
| https://github.com/mrubyc/mrubyc/blob/4261cf5e5ae… | technical-description |
| https://www.vulncheck.com/advisories/mrubyc-throu… | third-party-advisory |
Date Public
2026-09-07 00:00
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