Vulnerability-Lookup

ubuntu-cve-2026-48101

Vulnerability from osv_ubuntu

Published

2026-06-05 16:16

Modified

2026-06-11 13:06

Summary

Details

7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.

Severity

6.5 (Medium)


                    
                      CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-48101	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-48101	REPORT
	https://securitylab.github.com/advisories/GHSL-20…	REPORT

JSON

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 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue.",
  "id": "UBUNTU-CVE-2026-48101",
  "modified": "2026-06-11T13:06:29Z",
  "published": "2026-06-05T16:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-48101"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-48101"
    },
    {
      "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:H/I:N/A:N",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-48101"
  ]
}

CVE-2026-48101 (GCVE-0-2026-48101)

Vulnerability from cvelistv5 – Published: 2026-06-05 15:17 – Updated: 2026-06-05 19:38

Title

GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure

Summary

Severity

6.5 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N

SSVC

Exploitation: none Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-06-05 19:38 UTC

CWE

CWE-908 - Use of Uninitialized Resource

Assigner

GitHub_M mitre root

References

1 reference

URL	Tags
https://securitylab.github.com/advisories/GHSL-20…	x_refsource_CONFIRM

Impacted products

1 product

Vendor	Product	Version
mcmilk	7-Zip	Affected: >= 9.21, < 26.01

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-48101",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-05T19:38:03.046726Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-05T19:38:15.207Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "7-Zip",
          "vendor": "mcmilk",
          "versions": [
            {
              "status": "affected",
              "version": "\u003e= 9.21, \u003c 26.01"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "7-Zip is a file archiver with a high compression ratio. Versions 9.21 through 26.00 contain an An uninitialized memory disclosure vulnerability in the UEFI capsule (.scap) parser in 7-Zip. The OpenCapsule function allocates a heap buffer of attacker-declared CapsuleImageSize (up to 1 GiB) without zero-initialization, then reads the file contents into it with ReadStream_FALSE whose return value is silently discarded. If the file is truncated, the unread tail of the buffer retains uninitialized heap memory, which is then exposed as extracted file content via GetStream. Version 26.0.1 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "NONE",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:N/A:N",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-908",
              "description": "CWE-908: Use of Uninitialized Resource",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-05T15:17:38.676Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://securitylab.github.com/advisories/GHSL-2026-115_GHSL-2026-122_7-zip/"
        }
      ],
      "source": {
        "advisory": "GHSA-ch44-3vgx-78cc",
        "discovery": "UNKNOWN"
      },
      "title": "GHSL-2026-117: 7-Zip UEFI Capsule uninitialized heap memory disclosure"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-48101",
    "datePublished": "2026-06-05T15:17:38.676Z",
    "dateReserved": "2026-05-20T18:40:45.835Z",
    "dateUpdated": "2026-06-05T19:38:15.207Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.

Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.