CVE-2020-6840

9.8 criticalEPSS 1.5%

Critical (9.8) in mruby mruby. EPSS 1.5% chance of exploitation in the next 30 days.

In mruby 2.1.0, there is a use-after-free in hash_slice in mrbgems/mruby-hash-ext/src/hash-ext.c.

Severity

9.8 critical

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS: 1.5% chance of exploitation in the next 30 days; higher than 74% of CVEs (scores of 2026-10-31)
CWE: CWE-416
Published: 2020-01-11
Modified: 2026-06-17
Record from: the NVD, synced 2026-10-19