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No exploitation reported

CVE-2020-6838

No exploitation reported by the sources we read.

  • Published2020-01-11
  • WeaknessCWE-416

Am I affected?

With a domain, we read the version its public headers and pages expose. A distribution build can carry the fix under an older number.

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.

Timeline

dates in UTC
  1. 2020-01-1103:15CVE publishedNVD

Versions per branch

NVD
Mruby
BranchAffectedFixed in
2.1= 2.1.0no fix published

as publishedRanges as NVD and OSV publish them; a distribution’s build can be fixed under an older number.

Distribution builds and vendor advisories

Packages from OSV.dev and products from the vendors' CSAF advisories.

version not verifiedVersions not verified: read as OSV.dev and the vendors publish them, not checked against each vendor's release list.

Packages

  • mrubyUbuntu:26.10all versions · no fixed version listed
  • mrubyUbuntu:26.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:25.10all versions · no fixed version listed
  • mrubyUbuntu:24.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:22.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:20.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:18.04:LTSall versions · no fixed version listed
  • mrubyUbuntu:16.04:LTSall versions · no fixed version listed

Full record on NVD

Fix

No fix published by the sources we read yet. NVD record

Detection

Nuclei template
none so far
ProjectDiscovery
Exploit-DB
no entry
Exploit-DB
Proof of concept
Metasploit modules
none listed
Metasploit Framework

Sources

Identifiers

Technical details

CVSS v3 Vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Published
2020-01-11
Last Modified
2026-06-17
NVD status
Modified
GitHub Advisory
GHSA-97qv-pm76-mg98

Frequently asked questions

What is CVE-2020-6838?

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

Is CVE-2020-6838 actively exploited?

Active exploitation of CVE-2020-6838 has not been confirmed. Its EPSS score was 1.5% on 2026-11-08, the estimated probability of exploitation in the next 30 days.

What is the CVSS score for CVE-2020-6838?

CVE-2020-6838 has a CVSS v3 base score of 9.8 (CRITICAL severity), with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

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