CVE catalog

CVE-2026-4424

A flaw was found in libarchive. This heap out-of-bounds…

A flaw was found in libarchive. This heap out-of-bounds read vulnerability exists in the RAR archive processing logic due to improper validation of the LZSS sliding window size after transitions between compression methods. A remote attacker can exploit this by providing a specially crafted RAR archive, leading to the disclosure of sensitive heap memory information without requiring authentication or user interaction.

Severity: High · CVSS 7.5CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Published: Mar 19, 2026, 12:00:00 AM UTC
Source: [NVD] · [CVE record]
EPSS: 1.26% · Oct 27, 2026

Projects and upstream resources

[libarchive][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": "libarchive",
      "status": "fixed",
      "release": "sid",
      "version": "3.8.10-2"
    },
    {
      "name": "libarchive",
      "status": "fixed",
      "release": "forky",
      "version": "3.8.9-1"
    },
    {
      "name": "libarchive",
      "status": "fixed",
      "release": "trixie",
      "version": "3.7.4-4+deb13u1"
    },
    {
      "name": "libarchive",
      "status": "fixed",
      "release": "bookworm",
      "version": "3.6.2-1+deb12u4"
    },
    {
      "name": "libarchive",
      "status": "fixed",
      "release": "bookworm-security",
      "version": "3.6.2-1+deb12u5"
    }
  ],
  "fixed_versions": [
    {
      "bug": 1131446,
      "name": "libarchive",
      "type": "source",
      "origin": null,
      "release": "sid",
      "urgency": "not yet assigned",
      "fixed_version": "3.8.7-1"
    },
    {
      "bug": 1131446,
      "name": "libarchive",
      "type": "source",
      "origin": null,
      "release": "forky",
      "urgency": "not yet assigned",
      "fixed_version": "3.8.7-1"
    },
    {
      "bug": 1131446,
      "name": "libarchive",
      "type": "source",
      "origin": null,
      "release": "trixie",
      "urgency": "not yet assigned",
      "fixed_version": "3.7.4-4+deb13u1"
    },
    {
      "bug": 1131446,
      "name": "libarchive",
      "type": "source",
      "origin": null,
      "release": "bookworm",
      "urgency": "not yet assigned",
      "fixed_version": "3.6.2-1+deb12u4"
    }
  ],
  "distribution_packages": [
    {
      "name": "libarchive",
      "ecosystem": "cpe",
      "fixed_version": "3.6.2-1+deb12u4"
    },
    {
      "name": "libarchive",
      "ecosystem": "cpe",
      "fixed_version": "3.7.2-2ubuntu0.7"
    },
    {
      "name": "libarchive-dev",
      "ecosystem": "cpe",
      "fixed_version": "3.7.2-2ubuntu0.7"
    },
    {
      "name": "libarchive-tools",
      "ecosystem": "cpe",
      "fixed_version": "3.7.2-2ubuntu0.7"
    },
    {
      "name": "libarchive13t64",
      "ecosystem": "cpe",
      "fixed_version": "3.7.2-2ubuntu0.7"
    },
    {
      "name": "libarchive",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-4424"
    },
    {
      "name": "hardened_images",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-4424"
    },
    {
      "name": "openshift_container_platform",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-4424"
    },
    {
      "name": "openshift_container_platform_for_arm64",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-4424"
    },
    {
      "name": "openshift_container_platform_for_power",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-4424"
    },
    {
      "name": "enterprise_linux",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-4424"
    },
    {
      "name": "enterprise_linux_server_aus",
      "ranges": [],
      "ecosystem": "cpe",
      "fixed_version": "",
      "provider_record_id": "NVD-CVE-2026-4424"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.0-2ubuntu1.5+esm2"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "3.4.0-1",
        "3.4.0-1build1",
        "3.4.0-1ubuntu2",
        "3.4.0-2ubuntu1",
        "3.4.0-2ubuntu1.1",
        "3.4.0-2ubuntu1.2",
        "3.4.0-2ubuntu1.3",
        "3.4.0-2ubuntu1.4",
        "3.4.0-2ubuntu1.5",
        "3.4.0-2ubuntu1.5+esm1"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.4.0-2ubuntu1.5+esm2",
      "provider_record_id": "USN-8292-1"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "3.4.3-2",
        "3.4.3-2build1",
        "3.5.2-1",
        "3.5.2-1ubuntu1",
        "3.6.0-1ubuntu1",
        "3.6.0-1ubuntu1.1",
        "3.6.0-1ubuntu1.2",
        "3.6.0-1ubuntu1.3",
        "3.6.0-1ubuntu1.4",
        "3.6.0-1ubuntu1.5",
        "3.6.0-1ubuntu1.6"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.6.0-1ubuntu1.7",
      "provider_record_id": "USN-8292-1"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.7.2-2ubuntu0.7"
            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "3.6.2-1ubuntu1",
        "3.7.2-1ubuntu1",
        "3.7.2-1ubuntu2",
        "3.7.2-1.1ubuntu2",
        "3.7.2-2",
        "3.7.2-2ubuntu0.1",
        "3.7.2-2ubuntu0.2",
        "3.7.2-2ubuntu0.3",
        "3.7.2-2ubuntu0.4",
        "3.7.2-2ubuntu0.5",
        "3.7.2-2ubuntu0.6"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.7.2-2ubuntu0.7",
      "provider_record_id": "USN-8292-1"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.7.7-0ubuntu3.2"
            }
          ]
        }
      ],
      "release": "25.10",
      "versions": [
        "3.7.7-0ubuntu2",
        "3.7.7-0ubuntu2.1",
        "3.7.7-0ubuntu2.2",
        "3.7.7-0ubuntu3",
        "3.7.7-0ubuntu3.1"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.7.7-0ubuntu3.2",
      "provider_record_id": "USN-8292-1"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.8.5-1ubuntu2.1"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "3.7.7-0ubuntu3",
        "3.8.5-1ubuntu1",
        "3.8.5-1ubuntu2"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.8.5-1ubuntu2.1",
      "provider_record_id": "USN-8292-1"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.4.0-2ubuntu1.5+esm2"
            }
          ]
        }
      ],
      "release": "pro",
      "versions": [
        "3.4.0-1",
        "3.4.0-1build1",
        "3.4.0-1ubuntu2",
        "3.4.0-2ubuntu1",
        "3.4.0-2ubuntu1.1",
        "3.4.0-2ubuntu1.2",
        "3.4.0-2ubuntu1.3",
        "3.4.0-2ubuntu1.4",
        "3.4.0-2ubuntu1.5",
        "3.4.0-2ubuntu1.5+esm1"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.4.0-2ubuntu1.5+esm2",
      "provider_record_id": "UBUNTU-CVE-2026-4424"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.6.0-1ubuntu1.7"
            }
          ]
        }
      ],
      "release": "22.04",
      "versions": [
        "3.4.3-2",
        "3.4.3-2build1",
        "3.5.2-1",
        "3.5.2-1ubuntu1",
        "3.6.0-1ubuntu1",
        "3.6.0-1ubuntu1.1",
        "3.6.0-1ubuntu1.2",
        "3.6.0-1ubuntu1.3",
        "3.6.0-1ubuntu1.4",
        "3.6.0-1ubuntu1.5",
        "3.6.0-1ubuntu1.6"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.6.0-1ubuntu1.7",
      "provider_record_id": "UBUNTU-CVE-2026-4424"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ]
        }
      ],
      "release": "24.04",
      "versions": [
        "3.6.2-1ubuntu1",
        "3.7.2-1ubuntu1",
        "3.7.2-1ubuntu2",
        "3.7.2-1.1ubuntu2",
        "3.7.2-2",
        "3.7.2-2ubuntu0.1",
        "3.7.2-2ubuntu0.2",
        "3.7.2-2ubuntu0.3",
        "3.7.2-2ubuntu0.4",
        "3.7.2-2ubuntu0.5",
        "3.7.2-2ubuntu0.6"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.7.2-2ubuntu0.7",
      "provider_record_id": "UBUNTU-CVE-2026-4424"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
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            }
          ]
        }
      ],
      "release": "25.10",
      "versions": [
        "3.7.7-0ubuntu2",
        "3.7.7-0ubuntu2.1",
        "3.7.7-0ubuntu2.2",
        "3.7.7-0ubuntu3",
        "3.7.7-0ubuntu3.1"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.7.7-0ubuntu3.2",
      "provider_record_id": "UBUNTU-CVE-2026-4424"
    },
    {
      "name": "libarchive",
      "distro": "ubuntu",
      "ranges": [
        {
          "type": "ECOSYSTEM",
          "events": [
            {
              "introduced": "0"
            },
            {
              "fixed": "3.8.5-1ubuntu2.1"
            }
          ]
        }
      ],
      "release": "26.04",
      "versions": [
        "3.7.7-0ubuntu3",
        "3.8.5-1ubuntu1",
        "3.8.5-1ubuntu2"
      ],
      "ecosystem": "deb",
      "fixed_version": "3.8.5-1ubuntu2.1",
      "provider_record_id": "UBUNTU-CVE-2026-4424"
    }
  ]
}

[Debian bug #1131446]

OpenFactory catalog packages

Matching against OpenFactory catalog package versions is in progress.

[Debian 12 (Bookworm)]

[libarchive13]Unknown
Source package: [libarchive]
Details (4)
- 3.6.2-1+deb12u4 · amd64 · bookworm
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u4 · arm64 · bookworm
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
[libarchive-dev]Unknown
Source package: [libarchive]
Details (4)
- 3.6.2-1+deb12u4 · amd64 · bookworm
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u4 · arm64 · bookworm
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
[libarchive-tools]Unknown
Source package: [libarchive]
Details (4)
- 3.6.2-1+deb12u4 · amd64 · bookworm
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u4 · arm64 · bookworm
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · amd64 · bookworm-security
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm
- 3.6.2-1+deb12u5 · arm64 · bookworm-security
  Fixed · Fixed: 3.6.2-1+deb12u4
  nvd · libarchive · debian · bookworm

Observed: Oct 23, 2026, 10:40:20 PM 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)]