CVE catalog

CVE-2026-0992

libxml2 vulnerabilities

A flaw was found in the libxml2 library. This uncontrolled resource consumption vulnerability occurs when processing XML catalogs that contain repeated <nextCatalog> elements pointing to the same downstream catalog. A remote attacker can exploit this by supplying crafted catalogs, causing the parser to redundantly traverse catalog chains. This leads to excessive CPU consumption and degrades application availability, resulting in a denial-of-service condition.

Severity: Medium · CVSS 5.3CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Published: Jan 15, 2026, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 0.46% · 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": "fixed",
      "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": "fixed",
      "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": 1125696,
      "name": "libxml2",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "2.15.2+dfsg-0.1"
    },
    {
      "bug": 1125696,
      "name": "libxml2",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "2.15.2+dfsg-0.1"
    },
    {
      "bug": 1125696,
      "name": "libxml2",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "2.12.7+dfsg+really2.9.14-2.1+deb13u3"
    },
    {
      "bug": 1125696,
      "name": "libxml2",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "2.9.14+dfsg-1.3~deb12u6"
    }
  ],
  "distribution_packages": [
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3~deb12u6"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.7"
    },
    {
      "name": "libxml2-dev",
      "distro": "ubuntu",
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.7"
    },
    {
      "name": "libxml2-doc",
      "distro": "ubuntu",
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.7"
    },
    {
      "name": "libxml2-utils",
      "distro": "ubuntu",
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.7"
    },
    {
      "name": "python3-libxml2",
      "distro": "ubuntu",
      "release": "noble",
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.7"
    },
    {
      "name": "hardened_images",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-0992"
    },
    {
      "name": "jboss_core_services",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-0992"
    },
    {
      "name": "openshift_container_platform",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-0992"
    },
    {
      "name": "enterprise_linux",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-0992"
    },
    {
      "name": "vios",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-0992"
    },
    {
      "name": "aix",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-0992"
    },
    {
      "name": "libxml2",
      "ranges": [
        {
          "fixed": "2.15.2",
          "introduced": "",
          "last_affected": "",
          "start_excluding": ""
        }
      ],
      "ecosystem": "cpe",
      "fixed_version": "2.15.2",
      "provider_record_id": "NVD-CVE-2026-0992"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.10+dfsg-5ubuntu0.20.04.10+esm4"
            }
          ]
        }
      ],
      "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"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.10+dfsg-5ubuntu0.20.04.10+esm4",
      "provider_record_id": "UBUNTU-CVE-2026-0992"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.13+dfsg-1ubuntu0.11"
            }
          ]
        }
      ],
      "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"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.13+dfsg-1ubuntu0.11",
      "provider_record_id": "UBUNTU-CVE-2026-0992"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.9.14+dfsg-1.3ubuntu3.7"
            }
          ]
        }
      ],
      "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"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.9.14+dfsg-1.3ubuntu3.7",
      "provider_record_id": "UBUNTU-CVE-2026-0992"
    },
    {
      "name": "libxml2",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "2.14.5+dfsg-0.2ubuntu0.1"
            }
          ]
        }
      ],
      "release": "25.10",
      "versions": [
        "2.12.7+dfsg+really2.9.14-0.4",
        "2.12.7+dfsg+really2.9.14-0.4ubuntu0.1",
        "2.12.7+dfsg+really2.9.14-1",
        "2.14.3+dfsg-0exp1",
        "2.14.3+dfsg-0exp2",
        "2.14.3+dfsg-0exp3",
        "2.14.4+dfsg-0exp1",
        "2.14.5+dfsg-0exp1",
        "2.14.5+dfsg-0exp2",
        "2.14.5+dfsg-0.1",
        "2.14.5+dfsg-0.2"
      ],
      "ecosystem": "deb",
      "fixed_version": "2.14.5+dfsg-0.2ubuntu0.1",
      "provider_record_id": "UBUNTU-CVE-2026-0992"
    }
  ]
}

[Debian bug #1125696]

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

[Debian 13 (Trixie)]

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

Observed: Oct 27, 2026, 10:04:18 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] · [SUSE security advisories and VEX] · [Ubuntu Security Notices (USN)]