CVE catalog

CVE-2018-6836

wireshark affected and fixed versions

The netmonrec_comment_destroy function in wiretap/netmon.c in Wireshark through 2.4.4 performs a free operation on an uninitialized memory address, which allows remote attackers to cause a denial of service (application crash) or possibly have unspecified other impact.

Severity: Low · CVSS 3.3CVSS:3.0/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L
Published: Feb 5, 2018, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 2.72% · Oct 27, 2026

Projects and upstream resources

[wireshark][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-security	wireshark	`4.4.19-0+deb13u1`	Not affected	[CVE-2018-6836]
Debiantrixie	wireshark	Not reported	Not affectedDistribution reports not affected	[CVE-2018-6836]
Debiantrixie	wireshark	`4.4.18-0+deb13u1`	Not affected	[CVE-2018-6836]
Debiansid	wireshark	Not reported	Not affectedDistribution reports not affected	[CVE-2018-6836]
Debiansid	wireshark	`4.6.9-1`	Not affected	[CVE-2018-6836]
Debianforky	wireshark	Not reported	Not affectedDistribution reports not affected	[CVE-2018-6836]
Debianforky	wireshark	`4.6.9-1`	Not affected	[CVE-2018-6836]
Debianbookworm-security	wireshark	`4.0.17-0+deb12u3`	Not affected	[CVE-2018-6836]
Debianbookworm	wireshark	Not reported	Not affectedDistribution reports not affected	[CVE-2018-6836]
Debianbookworm	wireshark	`4.0.17-0+deb12u3`	Not affected	[CVE-2018-6836]
Ubuntu18.04	wireshark	`2.4.2-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu18.04	wireshark	`2.4.3-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC

Showing 12 observations. All 29 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence

Distribution / release	Package	Version	Status	Source
UnknownRelease not reported	wireshark	Not reported	UnknownSource applicability is not established	Provider not reported
Debianbookworm	wireshark	Not reported	Not affectedDistribution reports not affected	[CVE-2018-6836]
Debianbookworm	wireshark	`4.0.17-0+deb12u3`	Not affected	[CVE-2018-6836]
Debianbookworm-security	wireshark	`4.0.17-0+deb12u3`	Not affected	[CVE-2018-6836]
Debianforky	wireshark	Not reported	Not affectedDistribution reports not affected	[CVE-2018-6836]
Debianforky	wireshark	`4.6.9-1`	Not affected	[CVE-2018-6836]
Debiansid	wireshark	Not reported	Not affectedDistribution reports not affected	[CVE-2018-6836]
Debiansid	wireshark	`4.6.9-1`	Not affected	[CVE-2018-6836]
Debiantrixie	wireshark	Not reported	Not affectedDistribution reports not affected	[CVE-2018-6836]
Debiantrixie	wireshark	`4.4.18-0+deb13u1`	Not affected	[CVE-2018-6836]
Debiantrixie-security	wireshark	`4.4.19-0+deb13u1`	Not affected	[CVE-2018-6836]
Ubuntu14.04	wireshark	`1.10.2-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu14.04	wireshark	`1.10.3-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu14.04	wireshark	`1.10.5-1ubuntu1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu14.04	wireshark	`1.10.5-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu14.04	wireshark	`1.10.6-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu14.04	wireshark	`1.12.1+g01b65bf-4+deb8u11ubuntu0.14.04.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu14.04	wireshark	`2.6.3-1~ubuntu14.04.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu16.04	wireshark	`1.12.7+g7fc8978-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu16.04	wireshark	`1.12.8+g5b6e543-2`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu16.04	wireshark	`2.0.1+g59ea380-3build1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu16.04	wireshark	`2.0.2+ga16e22e-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu16.04	wireshark	`2.2.6+g32dac6a-2ubuntu0.16.04`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu16.04	wireshark	`2.6.3-1~ubuntu16.04.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu18.04	wireshark	`2.4.2-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu18.04	wireshark	`2.4.3-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu18.04	wireshark	`2.4.4-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu18.04	wireshark	`2.4.5-1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC
Ubuntu18.04	wireshark	`2.6.3-1~ubuntu18.04.1`	UnknownSource applicability is not established	[UBUNTU-CVE-2018-6836]Apr 22, 2026, 12:01:39 PM UTC

Original provider fields

{
  "package_releases": [
    {
      "name": "wireshark",
      "status": "not affected",
      "release": "sid",
      "version": "4.6.9-1"
    },
    {
      "name": "wireshark",
      "status": "not affected",
      "release": "forky",
      "version": "4.6.9-1"
    },
    {
      "name": "wireshark",
      "status": "not affected",
      "release": "trixie",
      "version": "4.4.18-0+deb13u1"
    },
    {
      "name": "wireshark",
      "status": "not affected",
      "release": "trixie-security",
      "version": "4.4.19-0+deb13u1"
    },
    {
      "name": "wireshark",
      "status": "not affected",
      "release": "bookworm",
      "version": "4.0.17-0+deb12u3"
    },
    {
      "name": "wireshark",
      "status": "not affected",
      "release": "bookworm-security",
      "version": "4.0.17-0+deb12u3"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "wireshark",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "wireshark",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "wireshark",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": "0"
    },
    {
      "bug": null,
      "name": "wireshark",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "0"
    }
  ],
  "distribution_packages": [
    {
      "name": "wireshark",
      "fixed_version": "0",
      "applicability_unknown": true
    },
    {
      "name": "wireshark",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.3-1~ubuntu14.04.1"
            }
          ]
        }
      ],
      "release": "14.04",
      "versions": [
        "1.10.2-1",
        "1.10.3-1",
        "1.10.5-1ubuntu1",
        "1.10.5-2",
        "1.10.6-1",
        "1.12.1+g01b65bf-4+deb8u11ubuntu0.14.04.1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2018-6836",
      "fixed_version": "2.6.3-1~ubuntu14.04.1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2018-6836",
      "provider_updated_at": "2026-04-22T12:01:39.460165Z",
      "applicability_unknown": true
    },
    {
      "name": "wireshark",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.3-1~ubuntu16.04.1"
            }
          ]
        }
      ],
      "release": "16.04",
      "versions": [
        "1.12.7+g7fc8978-1",
        "1.12.8+g5b6e543-2",
        "2.0.1+g59ea380-3build1",
        "2.0.2+ga16e22e-1",
        "2.2.6+g32dac6a-2ubuntu0.16.04"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2018-6836",
      "fixed_version": "2.6.3-1~ubuntu16.04.1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2018-6836",
      "provider_updated_at": "2026-04-22T12:01:39.460165Z",
      "applicability_unknown": true
    },
    {
      "name": "wireshark",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.6.3-1~ubuntu18.04.1"
            }
          ]
        }
      ],
      "release": "18.04",
      "versions": [
        "2.4.2-1",
        "2.4.3-1",
        "2.4.4-1",
        "2.4.5-1"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2018-6836",
      "fixed_version": "2.6.3-1~ubuntu18.04.1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2018-6836",
      "provider_updated_at": "2026-04-22T12:01:39.460165Z",
      "applicability_unknown": true
    }
  ]
}

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libwireshark16]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[libwireshark-data]Unknown
Source package: [wireshark]
Details (6)
- 4.0.17-0+deb12u3 · all · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · all · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · all · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · all · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.6-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.6-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[libwireshark-dev]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[libwiretap13]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[libwiretap-dev]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[libwsutil14]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[libwsutil-dev]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[tshark]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[wireshark]Unknown
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[wireshark-common]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[wireshark-dev]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[wireshark-doc]Unknown
Source package: [wireshark]
Details (6)
- 4.0.17-0+deb12u3 · all · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · all · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · all · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · all · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.6-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.6-1~deb12u1 · all · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[wireshark-gtk]Unknown
Source package: [wireshark]
Details (2)
- 4.0.6-1~deb12u1 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.6-1~deb12u1 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
[wireshark-qt]Unknown
Source package: [wireshark]
Details (4)
- 4.0.17-0+deb12u3 · amd64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · amd64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm
- 4.0.17-0+deb12u3 · arm64 · bookworm-security
  Not affected
  dsa · wireshark · debian · bookworm

Observed: Oct 23, 2026, 5:37:35 PM UTC

References

[Debian Security Tracker] · [FIRST EPSS] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX]