What’s Vulnerable › Vulnerabilities

CVE-2020-6838

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 1.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2020-01-11 · updated 2026-06-17
• Weakness: CWE-416

Description

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

Affected products

• mruby/mruby: 2.1.0

References

• https://github.com/mruby/mruby/issues/4926
• https://github.com/mruby/mruby/issues/4926

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