Vulnerability-Lookup

WID-SEC-W-2026-1681

Vulnerability from csaf_certbund - Published: 2026-05-26 22:00 - Updated: 2026-06-15 22:00

Summary

7-Zip: Schwachstelle ermöglicht Codeausführung

Severity

Hoch

Notes

Das BSI ist als Anbieter für die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch dafür verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgfältig im Einzelfall zu prüfen.

Produktbeschreibung: 7-Zip ist ein Extraktionsdienstprogramm für Archive, die im ZIP-Format komprimiert sind.

Angriff: Ein entfernter, anonymer Angreifer kann eine Schwachstelle in 7-Zip ausnutzen, um beliebigen Programmcode auszuführen.

Betroffene Betriebssysteme: - Linux - UNIX - Windows

CVE-2026-48095

Affected products

Known affected 3 products

Product	Identifier	Version
Open Source 7-Zip <26.01 Open Source / 7-Zip		<26.01
SUSE openSUSE SUSE	`cpe:/o:suse:opensuse:-`	—
Fedora Linux Fedora	`cpe:/o:fedoraproject:fedora:-`	—

References

8 references

URL	Category
https://wid.cert-bund.de/.well-known/csaf/white/2…	self
https://wid.cert-bund.de/portal/wid/securityadvis…	self
https://securitylab.github.com/advisories/GHSL-20…	external
https://socprime.com/blog/cve-2026-48095-7-zip-he…	external
https://lists.opensuse.org/archives/list/security…	external
https://bodhi.fedoraproject.org/updates/FEDORA-EP…	external
https://bodhi.fedoraproject.org/updates/FEDORA-20…	external
https://bodhi.fedoraproject.org/updates/FEDORA-EP…	external

JSON

To clipboard

{
  "document": {
    "aggregate_severity": {
      "text": "hoch"
    },
    "category": "csaf_base",
    "csaf_version": "2.0",
    "distribution": {
      "tlp": {
        "label": "WHITE",
        "url": "https://www.first.org/tlp/"
      }
    },
    "lang": "de-DE",
    "notes": [
      {
        "category": "legal_disclaimer",
        "text": "Das BSI ist als Anbieter f\u00fcr die eigenen, zur Nutzung bereitgestellten Inhalte nach den allgemeinen Gesetzen verantwortlich. Nutzerinnen und Nutzer sind jedoch daf\u00fcr verantwortlich, die Verwendung und/oder die Umsetzung der mit den Inhalten bereitgestellten Informationen sorgf\u00e4ltig im Einzelfall zu pr\u00fcfen."
      },
      {
        "category": "description",
        "text": "7-Zip ist ein Extraktionsdienstprogramm f\u00fcr Archive, die im ZIP-Format komprimiert sind.",
        "title": "Produktbeschreibung"
      },
      {
        "category": "summary",
        "text": "Ein entfernter, anonymer Angreifer kann eine Schwachstelle in 7-Zip ausnutzen, um beliebigen Programmcode auszuf\u00fchren.",
        "title": "Angriff"
      },
      {
        "category": "general",
        "text": "- Linux\n- UNIX\n- Windows",
        "title": "Betroffene Betriebssysteme"
      }
    ],
    "publisher": {
      "category": "other",
      "contact_details": "csaf-provider@cert-bund.de",
      "name": "Bundesamt f\u00fcr Sicherheit in der Informationstechnik",
      "namespace": "https://www.bsi.bund.de"
    },
    "references": [
      {
        "category": "self",
        "summary": "WID-SEC-W-2026-1681 - CSAF Version",
        "url": "https://wid.cert-bund.de/.well-known/csaf/white/2026/wid-sec-w-2026-1681.json"
      },
      {
        "category": "self",
        "summary": "WID-SEC-2026-1681 - Portal Version",
        "url": "https://wid.cert-bund.de/portal/wid/securityadvisory?name=WID-SEC-2026-1681"
      },
      {
        "category": "external",
        "summary": "GitHub Security Lab vom 2026-05-26 mit PoC",
        "url": "https://securitylab.github.com/advisories/GHSL-2026-140_7-Zip/"
      },
      {
        "category": "external",
        "summary": "SOC Prime Blog vom 2026-05-26",
        "url": "https://socprime.com/blog/cve-2026-48095-7-zip-heap-overflow-flaw/"
      },
      {
        "category": "external",
        "summary": "openSUSE Security Update OPENSUSE-SU-2026:10942-1 vom 2026-06-07",
        "url": "https://lists.opensuse.org/archives/list/security-announce@lists.opensuse.org/thread/MKEOLTFHUWP7BQ2ILOTOFFTHHM3IADU3/"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-EPEL-2026-52D18D8D5A vom 2026-06-15",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-52d18d8d5a"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-2026-4BE7569210 vom 2026-06-15",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-2026-4be7569210"
      },
      {
        "category": "external",
        "summary": "Fedora Security Advisory FEDORA-EPEL-2026-8D909527BA vom 2026-06-15",
        "url": "https://bodhi.fedoraproject.org/updates/FEDORA-EPEL-2026-8d909527ba"
      }
    ],
    "source_lang": "en-US",
    "title": "7-Zip: Schwachstelle erm\u00f6glicht Codeausf\u00fchrung",
    "tracking": {
      "current_release_date": "2026-06-15T22:00:00.000+00:00",
      "generator": {
        "date": "2026-06-16T08:24:59.053+00:00",
        "engine": {
          "name": "BSI-WID",
          "version": "1.6.0"
        }
      },
      "id": "WID-SEC-W-2026-1681",
      "initial_release_date": "2026-05-26T22:00:00.000+00:00",
      "revision_history": [
        {
          "date": "2026-05-26T22:00:00.000+00:00",
          "number": "1",
          "summary": "Initiale Fassung"
        },
        {
          "date": "2026-06-07T22:00:00.000+00:00",
          "number": "2",
          "summary": "Neue Updates von European Union Vulnerability Database und openSUSE aufgenommen"
        },
        {
          "date": "2026-06-15T22:00:00.000+00:00",
          "number": "3",
          "summary": "Neue Updates von Fedora aufgenommen"
        }
      ],
      "status": "final",
      "version": "3"
    }
  },
  "product_tree": {
    "branches": [
      {
        "branches": [
          {
            "category": "product_name",
            "name": "Fedora Linux",
            "product": {
              "name": "Fedora Linux",
              "product_id": "74185",
              "product_identification_helper": {
                "cpe": "cpe:/o:fedoraproject:fedora:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "Fedora"
      },
      {
        "branches": [
          {
            "branches": [
              {
                "category": "product_version_range",
                "name": "\u003c26.01",
                "product": {
                  "name": "Open Source 7-Zip \u003c26.01",
                  "product_id": "T054729"
                }
              },
              {
                "category": "product_version",
                "name": "26.01",
                "product": {
                  "name": "Open Source 7-Zip 26.01",
                  "product_id": "T054729-fixed",
                  "product_identification_helper": {
                    "cpe": "cpe:/a:7-zip:7-zip:26.01"
                  }
                }
              }
            ],
            "category": "product_name",
            "name": "7-Zip"
          }
        ],
        "category": "vendor",
        "name": "Open Source"
      },
      {
        "branches": [
          {
            "category": "product_name",
            "name": "SUSE openSUSE",
            "product": {
              "name": "SUSE openSUSE",
              "product_id": "T027843",
              "product_identification_helper": {
                "cpe": "cpe:/o:suse:opensuse:-"
              }
            }
          }
        ],
        "category": "vendor",
        "name": "SUSE"
      }
    ]
  },
  "vulnerabilities": [
    {
      "cve": "CVE-2026-48095",
      "product_status": {
        "known_affected": [
          "T054729",
          "T027843",
          "74185"
        ]
      },
      "release_date": "2026-05-26T22:00:00.000+00:00",
      "title": "CVE-2026-48095"
    }
  ]
}

CVE-2026-48095 (GCVE-0-2026-48095)

Vulnerability from cvelistv5 – Published: 2026-06-05 13:57 – Updated: 2026-06-08 19:10

Title

GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation

Summary

7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application crashes. CInStream::GetCuSize() in the NTFS handler computes the compression-unit buffer size as (UInt32)1 << (BlockSizeLog + CompressionUnit), and a crafted image with ClusterSizeLog >= 28 and CompressionUnit == 4 drives the exponent to 32, which is undefined behavior and collapses on x86/x64 so _inBuf is allocated as 1 byte. ReadStream_FALSE then writes up to 256 MB of attacker-controlled data into that 1-byte buffer in 64 KB iterations, and because the CInStream object sits only 304 bytes after _inBuf, its vtable pointer is overwritten and the next dispatched call achieves a vtable hijack. On 32-bit builds the overflow is unconditionally reached; on 64-bit it requires the parallel 8 GB _outBuf allocation to succeed, otherwise failing closed to denial of service. The NTFS handler is enabled by default in stock 7z.dll and, via signature-based fallback matching "NTFS " at offset 3, will open a crafted image regardless of file extension during extraction or testing. Version 26.01 fixes the issue.

Severity

8.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator (v2.0.3)

CWE

CWE-787 - Out-of-bounds Write
CWE-190 - Integer Overflow or Wraparound

Assigner

GitHub_M

References

2 references

URL	Tags
https://securitylab.github.com/advisories/GHSL-20…	x_refsource_CONFIRM
https://sourceforge.net/p/sevenzip/discussion/457…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
mcmilk	7-Zip	Affected: <= 26.00

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-48095",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-06-08T19:10:27.520353Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-06-08T19:10:46.668Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://securitylab.github.com/advisories/GHSL-2026-140_7-Zip/"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "7-Zip",
          "vendor": "mcmilk",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c= 26.00"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "7-Zip is a file archiver with a high compression ratio. Versions 26.00 and prior contain a heap buffer overflow vulnerability caused by an under-allocation in the NTFS compressed stream buffer (GetCuSize shift UB), potentially allowing attackers to cause arbitrary code execution or application crashes. CInStream::GetCuSize() in the NTFS handler computes the compression-unit buffer size as (UInt32)1 \u003c\u003c (BlockSizeLog + CompressionUnit), and a crafted image with ClusterSizeLog \u003e= 28 and CompressionUnit == 4 drives the exponent to 32, which is undefined behavior and collapses on x86/x64 so _inBuf is allocated as 1 byte. ReadStream_FALSE then writes up to 256 MB of attacker-controlled data into that 1-byte buffer in 64 KB iterations, and because the CInStream object sits only 304 bytes after _inBuf, its vtable pointer is overwritten and the next dispatched call achieves a vtable hijack. On 32-bit builds the overflow is unconditionally reached; on 64-bit it requires the parallel 8 GB _outBuf allocation to succeed, otherwise failing closed to denial of service. The NTFS handler is enabled by default in stock 7z.dll and, via signature-based fallback matching \"NTFS    \" at offset 3, will open a crafted image regardless of file extension during extraction or testing. Version 26.01 fixes the issue."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 8.8,
            "baseSeverity": "HIGH",
            "confidentialityImpact": "HIGH",
            "integrityImpact": "HIGH",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-787",
              "description": "CWE-787: Out-of-bounds Write",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "CWE-190: Integer Overflow or Wraparound",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-06-05T13:57:43.772Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://securitylab.github.com/advisories/GHSL-2026-140_7-Zip/",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://securitylab.github.com/advisories/GHSL-2026-140_7-Zip/"
        },
        {
          "name": "https://sourceforge.net/p/sevenzip/discussion/45797/thread/555e132ba4",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://sourceforge.net/p/sevenzip/discussion/45797/thread/555e132ba4"
        }
      ],
      "source": {
        "advisory": "GHSA-35m9-7297-xx42",
        "discovery": "UNKNOWN"
      },
      "title": "GHSL-2026-140_7-Zip: 7-Zip has a heap buffer overflow via NTFS compressed stream buffer under-allocation"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-48095",
    "datePublished": "2026-06-05T13:57:43.772Z",
    "dateReserved": "2026-05-20T18:40:45.834Z",
    "dateUpdated": "2026-06-08T19:10:46.668Z",
    "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.

Action not permitted

WID-SEC-W-2026-1681

CVE-2026-48095 (GCVE-0-2026-48095)

Tags

Sightings

Nomenclature