CVE catalog

CVE-2026-76781

A flaw was found in libxml2. A local user or an…

A flaw was found in libxml2. A local user or an attacker providing a specially crafted XML catalog can trigger a NULL pointer dereference during XML catalog parsing. This occurs when a `nextCatalog` element lacks its mandatory `catalog` attribute, leading to the application crashing and causing a Denial of Service (DoS).

Severity: Medium · CVSS 6.9CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L
Published: Aug 19, 2026, 12:00:00 AM UTC
Updated: Sep 17, 2026, 4:17:42 PM UTC
Source: [NVD] · [CVE record]
EPSS: 0.17% · Oct 27, 2026

Projects and upstream resources

[libxml2][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.

Version impact has not been established. The original provider fields are retained below.

Provider details and historical evidence

Original provider fields

{
  "package_releases": [
    {
      "name": "libxml2",
      "status": "fixed",
      "release": "sid",
      "version": "2.15.4+dfsg-1"
    },
    {
      "name": "libxml2",
      "status": "fixed",
      "release": "forky",
      "version": "2.15.4+dfsg-1"
    },
    {
      "name": "libxml2",
      "status": "vulnerable",
      "release": "trixie",
      "version": "2.12.7+dfsg+really2.9.14-2.1+deb13u3"
    },
    {
      "name": "libxml2",
      "status": "vulnerable",
      "release": "trixie-security",
      "version": "2.12.7+dfsg+really2.9.14-2.1+deb13u1"
    },
    {
      "name": "libxml2",
      "status": "vulnerable",
      "release": "bookworm",
      "version": "2.9.14+dfsg-1.3~deb12u6"
    },
    {
      "name": "libxml2",
      "status": "vulnerable",
      "release": "bookworm-security",
      "version": "2.9.14+dfsg-1.3~deb12u4"
    }
  ],
  "fixed_versions": [
    {
      "bug": null,
      "name": "libxml2",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.15.4+dfsg-1"
    },
    {
      "bug": null,
      "name": "libxml2",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.15.4+dfsg-1"
    },
    {
      "bug": null,
      "name": "libxml2",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": ""
    },
    {
      "bug": null,
      "name": "libxml2",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": ""
    }
  ],
  "distribution_packages": [
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.9.14+dfsg-1.3ubuntu3.10",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.10"
    },
    {
      "name": "libxml2-dev",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.9.14+dfsg-1.3ubuntu3.10",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.10"
    },
    {
      "name": "libxml2-doc",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.9.14+dfsg-1.3ubuntu3.10",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.10"
    },
    {
      "name": "libxml2-utils",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.9.14+dfsg-1.3ubuntu3.10",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.10"
    },
    {
      "name": "python3-libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "fixed": "2.9.14+dfsg-1.3ubuntu3.10",
          "introduced": "0"
        }
      ],
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.10"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.10+dfsg-5ubuntu0.20.04.10+esm6"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "2.9.4+dfsg1-7ubuntu3",
        "2.9.4+dfsg1-7ubuntu5",
        "2.9.4+dfsg1-8ubuntu1",
        "2.9.4+dfsg1-8ubuntu2",
        "2.9.4+dfsg1-8ubuntu3",
        "2.9.10+dfsg-1ubuntu3",
        "2.9.10+dfsg-4build1",
        "2.9.10+dfsg-5",
        "2.9.10+dfsg-5ubuntu0.20.04.1",
        "2.9.10+dfsg-5ubuntu0.20.04.2",
        "2.9.10+dfsg-5ubuntu0.20.04.3",
        "2.9.10+dfsg-5ubuntu0.20.04.4",
        "2.9.10+dfsg-5ubuntu0.20.04.5",
        "2.9.10+dfsg-5ubuntu0.20.04.6",
        "2.9.10+dfsg-5ubuntu0.20.04.7",
        "2.9.10+dfsg-5ubuntu0.20.04.8",
        "2.9.10+dfsg-5ubuntu0.20.04.9",
        "2.9.10+dfsg-5ubuntu0.20.04.10",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm1",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm2",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm3",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm4",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm5"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm6",
      "provider_record_id": "USN-8910-1"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.13+dfsg-1ubuntu0.14"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "2.9.12+dfsg-4",
        "2.9.12+dfsg-5",
        "2.9.12+dfsg-6",
        "2.9.13+dfsg-1",
        "2.9.13+dfsg-1build1",
        "2.9.13+dfsg-1ubuntu0.1",
        "2.9.13+dfsg-1ubuntu0.2",
        "2.9.13+dfsg-1ubuntu0.3",
        "2.9.13+dfsg-1ubuntu0.4",
        "2.9.13+dfsg-1ubuntu0.5",
        "2.9.13+dfsg-1ubuntu0.6",
        "2.9.13+dfsg-1ubuntu0.7",
        "2.9.13+dfsg-1ubuntu0.8",
        "2.9.13+dfsg-1ubuntu0.9",
        "2.9.13+dfsg-1ubuntu0.10",
        "2.9.13+dfsg-1ubuntu0.11",
        "2.9.13+dfsg-1ubuntu0.12",
        "2.9.13+dfsg-1ubuntu0.13"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.13+dfsg-1ubuntu0.14",
      "provider_record_id": "USN-8910-1"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.14+dfsg-1.3ubuntu3.10"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "2.9.14+dfsg-1.3",
        "2.9.14+dfsg-1.3build1",
        "2.9.14+dfsg-1.3build2",
        "2.9.14+dfsg-1.3build3",
        "2.9.14+dfsg-1.3ubuntu1",
        "2.9.14+dfsg-1.3ubuntu2",
        "2.9.14+dfsg-1.3ubuntu3",
        "2.9.14+dfsg-1.3ubuntu3.1",
        "2.9.14+dfsg-1.3ubuntu3.2",
        "2.9.14+dfsg-1.3ubuntu3.3",
        "2.9.14+dfsg-1.3ubuntu3.4",
        "2.9.14+dfsg-1.3ubuntu3.5",
        "2.9.14+dfsg-1.3ubuntu3.6",
        "2.9.14+dfsg-1.3ubuntu3.7",
        "2.9.14+dfsg-1.3ubuntu3.8",
        "2.9.14+dfsg-1.3ubuntu3.9"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.10",
      "provider_record_id": "USN-8910-1"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.15.2+dfsg-0.1ubuntu0.3"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "2.14.5+dfsg-0.2",
        "2.14.5+dfsg-0.2build1",
        "2.15.1+dfsg-0.3",
        "2.15.1+dfsg-0.4",
        "2.15.1+dfsg-1",
        "2.15.1+dfsg-2",
        "2.15.1+dfsg-2ubuntu1",
        "2.15.1+dfsg-2ubuntu2",
        "2.15.2+dfsg-0.1",
        "2.15.2+dfsg-0.1ubuntu0.1",
        "2.15.2+dfsg-0.1ubuntu0.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.15.2+dfsg-0.1ubuntu0.3",
      "provider_record_id": "USN-8910-1"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.10+dfsg-5ubuntu0.20.04.10+esm6"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "2.9.4+dfsg1-7ubuntu3",
        "2.9.4+dfsg1-7ubuntu5",
        "2.9.4+dfsg1-8ubuntu1",
        "2.9.4+dfsg1-8ubuntu2",
        "2.9.4+dfsg1-8ubuntu3",
        "2.9.10+dfsg-1ubuntu3",
        "2.9.10+dfsg-4build1",
        "2.9.10+dfsg-5",
        "2.9.10+dfsg-5ubuntu0.20.04.1",
        "2.9.10+dfsg-5ubuntu0.20.04.2",
        "2.9.10+dfsg-5ubuntu0.20.04.3",
        "2.9.10+dfsg-5ubuntu0.20.04.4",
        "2.9.10+dfsg-5ubuntu0.20.04.5",
        "2.9.10+dfsg-5ubuntu0.20.04.6",
        "2.9.10+dfsg-5ubuntu0.20.04.7",
        "2.9.10+dfsg-5ubuntu0.20.04.8",
        "2.9.10+dfsg-5ubuntu0.20.04.9",
        "2.9.10+dfsg-5ubuntu0.20.04.10",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm1",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm2",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm3",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm4",
        "2.9.10+dfsg-5ubuntu0.20.04.10+esm5"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm6",
      "provider_record_id": "UBUNTU-CVE-2026-76781"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.13+dfsg-1ubuntu0.14"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "2.9.12+dfsg-4",
        "2.9.12+dfsg-5",
        "2.9.12+dfsg-6",
        "2.9.13+dfsg-1",
        "2.9.13+dfsg-1build1",
        "2.9.13+dfsg-1ubuntu0.1",
        "2.9.13+dfsg-1ubuntu0.2",
        "2.9.13+dfsg-1ubuntu0.3",
        "2.9.13+dfsg-1ubuntu0.4",
        "2.9.13+dfsg-1ubuntu0.5",
        "2.9.13+dfsg-1ubuntu0.6",
        "2.9.13+dfsg-1ubuntu0.7",
        "2.9.13+dfsg-1ubuntu0.8",
        "2.9.13+dfsg-1ubuntu0.9",
        "2.9.13+dfsg-1ubuntu0.10",
        "2.9.13+dfsg-1ubuntu0.11",
        "2.9.13+dfsg-1ubuntu0.12",
        "2.9.13+dfsg-1ubuntu0.13"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.13+dfsg-1ubuntu0.14",
      "provider_record_id": "UBUNTU-CVE-2026-76781"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.14+dfsg-1.3ubuntu3.10"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "2.9.14+dfsg-1.3",
        "2.9.14+dfsg-1.3build1",
        "2.9.14+dfsg-1.3build2",
        "2.9.14+dfsg-1.3build3",
        "2.9.14+dfsg-1.3ubuntu1",
        "2.9.14+dfsg-1.3ubuntu2",
        "2.9.14+dfsg-1.3ubuntu3",
        "2.9.14+dfsg-1.3ubuntu3.1",
        "2.9.14+dfsg-1.3ubuntu3.2",
        "2.9.14+dfsg-1.3ubuntu3.3",
        "2.9.14+dfsg-1.3ubuntu3.4",
        "2.9.14+dfsg-1.3ubuntu3.5",
        "2.9.14+dfsg-1.3ubuntu3.6",
        "2.9.14+dfsg-1.3ubuntu3.7",
        "2.9.14+dfsg-1.3ubuntu3.8",
        "2.9.14+dfsg-1.3ubuntu3.9"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.10",
      "provider_record_id": "UBUNTU-CVE-2026-76781"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.15.2+dfsg-0.1ubuntu0.3"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "2.14.5+dfsg-0.2",
        "2.14.5+dfsg-0.2build1",
        "2.15.1+dfsg-0.3",
        "2.15.1+dfsg-0.4",
        "2.15.1+dfsg-1",
        "2.15.1+dfsg-2",
        "2.15.1+dfsg-2ubuntu1",
        "2.15.1+dfsg-2ubuntu2",
        "2.15.2+dfsg-0.1",
        "2.15.2+dfsg-0.1ubuntu0.1",
        "2.15.2+dfsg-0.1ubuntu0.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.15.2+dfsg-0.1ubuntu0.3",
      "provider_record_id": "UBUNTU-CVE-2026-76781"
    }
  ]
}

Publisher notes

[bookworm] libxml2: Minor issue; introduced by CVE-2026-0992 backport

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libxml2]Unknown
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · amd64 · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u6 · arm64 · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · amd64 · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · arm64 · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
[libxml2-dev]Unknown
Source package: [libxml2]
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · amd64 · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u6 · arm64 · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · amd64 · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · arm64 · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
[libxml2-doc]Unknown
Source package: [libxml2]
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · all · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u6 · all · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · all · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · all · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
[libxml2-utils]Unknown
Source package: [libxml2]
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · amd64 · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u6 · arm64 · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · amd64 · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · arm64 · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
[python3-libxml2]Unknown
Source package: [libxml2]
Details (4)
- 2.9.14+dfsg-1.3~deb12u6 · amd64 · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u6 · arm64 · bookworm
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · amd64 · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12
- 2.9.14+dfsg-1.3~deb12u4 · arm64 · bookworm-security
  Affected
  nvd · libxml2 · debian · bookworm; nvd · libxml2 · debian · 12

[Debian 13 (Trixie)]

[libxml2]Unknown
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · amd64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · arm64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
[libxml2-dev]Unknown
Source package: [libxml2]
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · amd64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · arm64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
[libxml2-doc]Unknown
Source package: [libxml2]
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · all · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · all · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · all · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · all · trixie-security
  Affected
  nvd · libxml2 · debian · 13
[libxml2-utils]Unknown
Source package: [libxml2]
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · amd64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · arm64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
[python3-libxml2]Unknown
Source package: [libxml2]
Details (4)
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · amd64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u3 · arm64 · trixie
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · amd64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13
- 2.12.7+dfsg+really2.9.14-2.1+deb13u1 · arm64 · trixie-security
  Affected
  nvd · libxml2 · debian · 13

Observed: Oct 27, 2026, 7:04:29 AM UTC

References

[CERT-Bund public advisories] · [Debian Security Tracker] · [FIRST EPSS] · [National Vulnerability Database (NVD)] · [OSV Package Vulnerability Database] · [Red Hat security advisories and VEX] · [Ubuntu Security Notices (USN)]