ubuntu-cve-2026-48103
Vulnerability from osv_ubuntu
Published
2026-06-05 17:16
Modified
2026-06-11 13:06
Summary
Details

7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain an off-by-one heap out-of-bounds read in the WIM (Windows Imaging) archive handler's security descriptor lookup. In CHandler::GetSecurity (CPP/7zip/Archive/Wim/WimHandler.cpp), the per-image SecurOffsets table holds numEntries + 1 cumulative offsets, but the check securityId >= SecurOffsets.Size() admits securityId == numEntries, and the function then reads SecurOffsets[securityId + 1], fetching one UInt32 past the end of the heap-allocated CRecordVector (which performs no bounds checking on operator[]). The securityId is attacker-controlled at offset +0xC of any directory entry in WIM metadata, and the handler is registered for .wim, .swm, .esd, and .ppkg and enabled by default in stock 7z.dll; the OOB triggers zero-click in the GUI because 7zFM.exe's ListView calls GetRawProp(kpidNtSecure) for every item during listing (ASan-confirmed), and is also reachable via CLI listing with 7zz l -slt. Impact is limited to denial of service under hardened allocators and minor information disclosure, since the OOB value is only consumed arithmetically as a length and is not surfaced to the attacker; there is no write primitive.

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

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "p7zip",
            "binary_version": "9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
          },
          {
            "binary_name": "p7zip-full",
            "binary_version": "9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:14.04:LTS",
        "name": "p7zip",
        "purl": "pkg:deb/ubuntu/p7zip@9.20.1~dfsg.1-4+deb7u3build0.14.04.1?arch=source\u0026distro=trusty"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.20.1~dfsg.1-4",
        "9.20.1~dfsg.1-4+deb7u1build0.14.04.1",
        "9.20.1~dfsg.1-4+deb7u2build0.14.04.1",
        "9.20.1~dfsg.1-4+deb7u3build0.14.04.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "p7zip",
            "binary_version": "9.20.1~dfsg.1-4.2ubuntu0.1"
          },
          {
            "binary_name": "p7zip-full",
            "binary_version": "9.20.1~dfsg.1-4.2ubuntu0.1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "p7zip",
        "purl": "pkg:deb/ubuntu/p7zip@9.20.1~dfsg.1-4.2ubuntu0.1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "9.20.1~dfsg.1-4.2",
        "9.20.1~dfsg.1-4.2ubuntu0.1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "p7zip",
            "binary_version": "16.02+dfsg-6"
          },
          {
            "binary_name": "p7zip-full",
            "binary_version": "16.02+dfsg-6"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "p7zip",
        "purl": "pkg:deb/ubuntu/p7zip@16.02+dfsg-6?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "16.02+dfsg-4",
        "16.02+dfsg-5",
        "16.02+dfsg-6"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "p7zip",
            "binary_version": "16.02+dfsg-7build1"
          },
          {
            "binary_name": "p7zip-full",
            "binary_version": "16.02+dfsg-7build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "p7zip",
        "purl": "pkg:deb/ubuntu/p7zip@16.02+dfsg-7build1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "16.02+dfsg-7",
        "16.02+dfsg-7build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "p7zip",
            "binary_version": "16.02+dfsg-8"
          },
          {
            "binary_name": "p7zip-full",
            "binary_version": "16.02+dfsg-8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "p7zip",
        "purl": "pkg:deb/ubuntu/p7zip@16.02+dfsg-8?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "16.02+dfsg-8"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "7zip",
            "binary_version": "21.07+dfsg-4ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "7zip",
        "purl": "pkg:deb/ubuntu/7zip@21.07+dfsg-4ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "21.03~beta+dfsg-6",
        "21.04~beta+dfsg-1",
        "21.06+dfsg-1",
        "21.07+dfsg-1",
        "21.07+dfsg-2",
        "21.07+dfsg-3",
        "21.07+dfsg-4",
        "21.07+dfsg-4ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "7zip",
            "binary_version": "23.01+dfsg-11ubuntu0.1~esm1"
          },
          {
            "binary_name": "7zip-standalone",
            "binary_version": "23.01+dfsg-11ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "7zip",
        "purl": "pkg:deb/ubuntu/7zip@23.01+dfsg-11ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "23.01+dfsg-3",
        "23.01+dfsg-7",
        "23.01+dfsg-8",
        "23.01+dfsg-11",
        "23.01+dfsg-11ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "7zip",
            "binary_version": "25.01+dfsg-2"
          },
          {
            "binary_name": "7zip-standalone",
            "binary_version": "25.01+dfsg-2"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "7zip",
        "purl": "pkg:deb/ubuntu/7zip@25.01+dfsg-2?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "24.09+dfsg-7",
        "24.09+dfsg-8",
        "25.00+dfsg-1",
        "25.01+dfsg-1",
        "25.01+dfsg-2"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "7zip",
            "binary_version": "26.00+dfsg-1"
          },
          {
            "binary_name": "7zip-standalone",
            "binary_version": "26.00+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "7zip",
        "purl": "pkg:deb/ubuntu/7zip@26.00+dfsg-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "25.01+dfsg-2",
        "25.01+dfsg-3",
        "25.01+dfsg-4",
        "25.01+dfsg-5",
        "26.00+dfsg-1"
      ]
    }
  ],
  "aliases": [],
  "details": "7-Zip is a file archiver with a high compression ratio. Versions 9.34 through 26.00 contain an off-by-one heap out-of-bounds read in the WIM (Windows Imaging) archive handler\u0027s security descriptor lookup. In CHandler::GetSecurity (CPP/7zip/Archive/Wim/WimHandler.cpp), the per-image SecurOffsets table holds numEntries + 1 cumulative offsets, but the check securityId \u003e= SecurOffsets.Size() admits securityId == numEntries, and the function then reads SecurOffsets[securityId + 1], fetching one UInt32 past the end of the heap-allocated CRecordVector (which performs no bounds checking on operator[]). The securityId is attacker-controlled at offset +0xC of any directory entry in WIM metadata, and the handler is registered for .wim, .swm, .esd, and .ppkg and enabled by default in stock 7z.dll; the OOB triggers zero-click in the GUI because 7zFM.exe\u0027s ListView calls GetRawProp(kpidNtSecure) for every item during listing (ASan-confirmed), and is also reachable via CLI listing with 7zz l -slt. Impact is limited to denial of service under hardened allocators and minor information disclosure, since the OOB value is only consumed arithmetically as a length and is not surfaced to the attacker; there is no write primitive.",
  "id": "UBUNTU-CVE-2026-48103",
  "modified": "2026-06-11T13:06:29Z",
  "published": "2026-06-05T17:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-48103"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-48103"
    },
    {
      "type": "REPORT",
      "url": "https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-48103"
  ]
}



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