Vulnerability · Published Jul 6, 2026 · Assigned by mitre

CVE-2026-38973

Medium 4.4

In plain English

A medium-severity out-of-bounds read in the affected software. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.2% (higher than 6% of all known vulnerabilities).

Severity (CVSS 3.1)4.4Medium

Exploit odds (30 days)0.2%top 94.3% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

mrubyc through release3.4.1 was found to contain an out-of-bounds read in builtin missing-method lookup inside mrbc_find_method().

Affected products (as reported)

Vendor	Product	Versions
n/a	n/a	n/a

Weakness: CWE-125 · Vector: CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:L

References

https://github.com/mrubyc/mrubyc/issues/279%2C
https://github.com/mrubyc/mrubyc/commit/f83a8b67ca1c7c62ac0dd548a363d79f767c4e30
https://github.com/mrubyc/mrubyc