UBUNTU-CVE-2026-63209 (CVE-2026-63209)

Vulnerability from osv_ubuntu – Published: 2026-09-29 15:17 – Updated: 2026-09-29 15:17 – Source website
VLAI
Details

compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7.

Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
N/A (UNKNOWN)
medium
References
To clipboard 

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-klauspost-compress-dev",
            "binary_version": "0.0~git20151221.0.2dd54ae-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "golang-github-klauspost-compress",
        "purl": "pkg:deb/ubuntu/golang-github-klauspost-compress@0.0~git20151221.0.2dd54ae-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.0~git20151221.0.2dd54ae-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-klauspost-compress-dev",
            "binary_version": "1.2.1-5"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "golang-github-klauspost-compress",
        "purl": "pkg:deb/ubuntu/golang-github-klauspost-compress@1.2.1-5?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.1-1",
        "1.2.1-2",
        "1.2.1-4",
        "1.2.1-5"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-klauspost-compress-dev",
            "binary_version": "1.9.5-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "golang-github-klauspost-compress",
        "purl": "pkg:deb/ubuntu/golang-github-klauspost-compress@1.9.5-2?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.2.1-5",
        "1.7.6-2",
        "1.9.5-1",
        "1.9.5-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-klauspost-compress-dev",
            "binary_version": "1.11.7-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "golang-github-klauspost-compress",
        "purl": "pkg:deb/ubuntu/golang-github-klauspost-compress@1.11.7-2?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.11.7-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-klauspost-compress-dev",
            "binary_version": "1.17.7+ds1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "golang-github-klauspost-compress",
        "purl": "pkg:deb/ubuntu/golang-github-klauspost-compress@1.17.7+ds1-1?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.15.12+ds1-3",
        "1.17.7+ds1-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "golang-github-klauspost-compress-dev",
            "binary_version": "1.18.1+ds1-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "golang-github-klauspost-compress",
        "purl": "pkg:deb/ubuntu/golang-github-klauspost-compress@1.18.1+ds1-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.18.0+ds1-1",
        "1.18.1+ds1-1"
      ]
    }
  ],
  "aliases": [],
  "details": "compress provides various compression algorithms. Prior to version 1.18.7, a signed integer overflow vulnerability in s2.NewDict() allows an attacker to bypass repeat index validation by supplying a dictionary with a uvarint-encoded repeat value exceeding MaxInt64. When Dict.Encode() is subsequently called, the overflowed negative repeat value causes an out-of-bounds memory access via unsafe.Pointer arithmetic, crashing the process with SIGSEGV. This issue has been patched in version 1.18.7.",
  "id": "UBUNTU-CVE-2026-63209",
  "modified": "2026-09-29T15:17:00Z",
  "published": "2026-09-29T15:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-63209"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-63209"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/klauspost/compress/commit/539243b8823ee8f03e49969823d57c348c917536"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/klauspost/compress/releases/tag/v1.18.7"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/klauspost/compress/security/advisories/GHSA-259r-337f-4rfw"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-63209"
  ]
}



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