CVE catalog

CVE-2021-23191

htmldoc affected and fixed versions

[CVE catalog]

A security issue was found in htmldoc v1.9.12 and before. A NULL pointer dereference in the function image_load_jpeg() in image.cxx may result in denial of service.

Severity
High · CVSS 8.6CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:H
Published
Source
[NVD] · [CVE record]
EPSS
1.10% · Oct 27, 2026

Projects and upstream resources

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 / releasePackageVersionStatusSource
Debiantrixiehtmldoc1.9.11-4FixedDistribution-reported fixed boundary[CVE-2021-23191]
Debiantrixiehtmldoc1.9.20-1Fixed[CVE-2021-23191]
Debiansidhtmldoc1.9.11-4FixedDistribution-reported fixed boundary[CVE-2021-23191]
Debiansidhtmldoc1.9.24-1Fixed[CVE-2021-23191]
Debianforkyhtmldoc1.9.11-4FixedDistribution-reported fixed boundary[CVE-2021-23191]
Debianforkyhtmldoc1.9.24-1Fixed[CVE-2021-23191]
Debianbookwormhtmldoc1.9.11-4FixedDistribution-reported fixed boundary[CVE-2021-23191]
Debianbookwormhtmldoc1.9.16-1Fixed[CVE-2021-23191]

Showing 8 fix observations. All 14 observations, including unknown and conflicting reports, are available below.

Provider details and historical evidence
Distribution / releasePackageVersionStatusSource
Debianbookwormhtmldoc1.9.11-4FixedDistribution-reported fixed boundary[CVE-2021-23191]
Debianbookwormhtmldoc1.9.16-1Fixed[CVE-2021-23191]
Debianforkyhtmldoc1.9.11-4FixedDistribution-reported fixed boundary[CVE-2021-23191]
Debianforkyhtmldoc1.9.24-1Fixed[CVE-2021-23191]
Debiansidhtmldoc1.9.11-4FixedDistribution-reported fixed boundary[CVE-2021-23191]
Debiansidhtmldoc1.9.24-1Fixed[CVE-2021-23191]
Debiantrixiehtmldoc1.9.11-4FixedDistribution-reported fixed boundary[CVE-2021-23191]
Debiantrixiehtmldoc1.9.20-1Fixed[CVE-2021-23191]
Ubuntuprohtmldoc1.9.3-1UnknownSource applicability is not established[UBUNTU-CVE-2021-23191]
Ubuntuprohtmldoc1.9.7-1UnknownSource applicability is not established[UBUNTU-CVE-2021-23191]
Ubuntuprohtmldoc1.9.7-1build1UnknownSource applicability is not established[UBUNTU-CVE-2021-23191]
Ubuntuprohtmldoc1.9.7-1ubuntu0.2UnknownSource applicability is not established[UBUNTU-CVE-2021-23191]
Ubuntuprohtmldoc1.9.7-1ubuntu0.3UnknownSource applicability is not established[UBUNTU-CVE-2021-23191]
Ubuntuprohtmldoc1.9.7-1ubuntu0.3+esm1UnknownSource applicability is not established[UBUNTU-CVE-2021-23191]
Original provider fields
{
  "package_releases": [
    {
      "name": "htmldoc",
      "status": "fixed",
      "release": "sid",
      "version": "1.9.24-1"
    },
    {
      "name": "htmldoc",
      "status": "fixed",
      "release": "forky",
      "version": "1.9.24-1"
    },
    {
      "name": "htmldoc",
      "status": "fixed",
      "release": "trixie",
      "version": "1.9.20-1"
    },
    {
      "name": "htmldoc",
      "status": "fixed",
      "release": "bookworm",
      "version": "1.9.16-1"
    }
  ],
  "fixed_versions": [
    {
      "bug": 989437,
      "name": "htmldoc",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "unimportant",
      "fixed_version": "1.9.11-4"
    },
    {
      "bug": 989437,
      "name": "htmldoc",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "unimportant",
      "fixed_version": "1.9.11-4"
    },
    {
      "bug": 989437,
      "name": "htmldoc",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "unimportant",
      "fixed_version": "1.9.11-4"
    },
    {
      "bug": 989437,
      "name": "htmldoc",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "unimportant",
      "fixed_version": "1.9.11-4"
    }
  ],
  "distribution_packages": [
    {
      "name": "htmldoc",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "1.9.7-1ubuntu0.3+esm1"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "1.9.3-1",
        "1.9.7-1",
        "1.9.7-1build1",
        "1.9.7-1ubuntu0.2",
        "1.9.7-1ubuntu0.3"
      ],
      "ecosystem": "deb",
      "provider_url": "https://osv.dev/vulnerability/UBUNTU-CVE-2021-23191",
      "fixed_version": "1.9.7-1ubuntu0.3+esm1",
      "provider_source": "pypi",
      "provider_record_id": "UBUNTU-CVE-2021-23191",
      "provider_updated_at": "2026-02-04T04:11:56.099768Z",
      "applicability_unknown": true
    }
  ]
}

[Debian bug #989437]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

  • [htmldoc]Unknown
    Details (2)

    • 1.9.16-1 · amd64 · bookworm

      Fixed · Fixed: 1.9.11-4

      dsa · htmldoc · debian · bookworm; dsa · htmldoc · debian · 12

    • 1.9.16-1 · arm64 · bookworm

      Fixed · Fixed: 1.9.11-4

      dsa · htmldoc · debian · bookworm; dsa · htmldoc · debian · 12

  • [htmldoc-common]Unknown

    Source package: [htmldoc]

    Details (2)

    • 1.9.16-1 · all · bookworm

      Fixed · Fixed: 1.9.11-4

      dsa · htmldoc · debian · bookworm; dsa · htmldoc · debian · 12

    • 1.9.16-1 · all · bookworm

      Fixed · Fixed: 1.9.11-4

      dsa · htmldoc · debian · bookworm; dsa · htmldoc · debian · 12

[Debian 13 (Trixie)]

  • [htmldoc]Unknown
    Details (2)

    • 1.9.20-1 · amd64 · trixie

      Fixed · Fixed: 1.9.11-4

      dsa · htmldoc · debian · 13

    • 1.9.20-1 · arm64 · trixie

      Fixed · Fixed: 1.9.11-4

      dsa · htmldoc · debian · 13

  • [htmldoc-common]Unknown

    Source package: [htmldoc]

    Details (2)

    • 1.9.20-1 · all · trixie

      Fixed · Fixed: 1.9.11-4

      dsa · htmldoc · debian · 13

    • 1.9.20-1 · all · trixie

      Fixed · Fixed: 1.9.11-4

      dsa · htmldoc · debian · 13

Observed:

References

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