mrubyc through 4.0.0 NULL Pointer Dereference via OP_ENTER
33Vexday Risk Score
No sign of exploitation. It has a public proof of concept.
ssvc Attendcvss 6.9epss 0.2%
from disclosure to weapon3 days
Published on NVDSep 9
1st PoC+3d
exploitation probability
0.2%top 93% of all CVEs
observed exploitation
nono source reports it
1 public exploit(s)
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.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
mrubyc · mrubycpublic PoCs found — 1
githubgithub.com/HarshRajSinghania/cve-2026-86547-mrubyc-op-enter★ 0⚠ Public resources, to assess the exposure of systems you control or are authorized to test. Test only with authorization.