CVE catalog

CVE-2020-6840

mruby affected and fixed versions

[CVE catalog]

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

Severity: Low
Source: [NVD] · [CVE record]
EPSS: 1.50% · Oct 27, 2026

Projects and upstream resources

[mruby][Source-reported homepage]

Reported versions and fixes

Each observation applies to its named package, distribution, and release. Distribution backports can fix a vulnerability while retaining an older upstream version number.

Distribution / release	Package	Version	Status	Source
Debiantrixie	mruby	Not reported	Not affectedDistribution reports not affected	[CVE-2020-6840]
Debiantrixie	mruby	`3.3.0-1`	Not affected	[CVE-2020-6840]
Debiansid	mruby	Not reported	Not affectedDistribution reports not affected	[CVE-2020-6840]
Debiansid	mruby	`4.0.0-1`	Not affected	[CVE-2020-6840]
Debianforky	mruby	Not reported	Not affectedDistribution reports not affected	[CVE-2020-6840]
Debianforky	mruby	`4.0.0-1`	Not affected	[CVE-2020-6840]
Debianbookworm	mruby	Not reported	Not affectedDistribution reports not affected	[CVE-2020-6840]
Debianbookworm	mruby	`3.1.0-3`	Not affected	[CVE-2020-6840]

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
Debianbookworm	mruby	Not reported	Not affectedDistribution reports not affected	[CVE-2020-6840]
Debianbookworm	mruby	`3.1.0-3`	Not affected	[CVE-2020-6840]
Debianforky	mruby	Not reported	Not affectedDistribution reports not affected	[CVE-2020-6840]
Debianforky	mruby	`4.0.0-1`	Not affected	[CVE-2020-6840]
Debiansid	mruby	Not reported	Not affectedDistribution reports not affected	[CVE-2020-6840]
Debiansid	mruby	`4.0.0-1`	Not affected	[CVE-2020-6840]
Debiantrixie	mruby	Not reported	Not affectedDistribution reports not affected	[CVE-2020-6840]
Debiantrixie	mruby	`3.3.0-1`	Not affected	[CVE-2020-6840]

Original provider fields

{
  "package_releases": [
    {
      "name": "mruby",
      "status": "not affected",
      "release": "sid",
      "version": "4.0.0-1"
    },
    {
      "name": "mruby",
      "status": "not affected",
      "release": "forky",
      "version": "4.0.0-1"
    },
    {
      "name": "mruby",
      "status": "not affected",
      "release": "trixie",
      "version": "3.3.0-1"
    },
    {
      "name": "mruby",
      "status": "not affected",
      "release": "bookworm",
      "version": "3.1.0-3"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "mruby",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "mruby",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "mruby",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "mruby",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "0"
    }
  ],
  "distribution_packages": []
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libmruby-dev]Unknown
Source package: [mruby]
Details (2)
- 3.1.0-3 · amd64 · bookworm
  Not affected
  dsa · mruby · debian · bookworm
- 3.1.0-3 · arm64 · bookworm
  Not affected
  dsa · mruby · debian · bookworm
[mruby]Unknown
Details (2)
- 3.1.0-3 · amd64 · bookworm
  Not affected
  dsa · mruby · debian · bookworm
- 3.1.0-3 · arm64 · bookworm
  Not affected
  dsa · mruby · debian · bookworm

Observed: Oct 23, 2026, 5:53:15 PM UTC

References

[https://security-tracker.debian.org/tracker/CVE-2020-6840]

[Debian Security Tracker] · [FIRST EPSS]