Vulnerability-Lookup

OPENSUSE-SU-2026:10942-1

Vulnerability from csaf_opensuse - Published: 2026-06-03 00:00 - Updated: 2026-09-17 17:08

Summary

7zip-26.01-1.1 on GA media

Severity

Moderate

Notes

Title of the patch: 7zip-26.01-1.1 on GA media

Description of the patch: These are all security issues fixed in the 7zip-26.01-1.1 package on the GA media of openSUSE Tumbleweed.

Patchnames: openSUSE-Tumbleweed-2026-10942

CVE-2026-48095

7.8 (High)


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

Affected products

Recommended 4 products

Product	Version	Remediation
Unresolved product id: openSUSE Tumbleweed:7zip-0:26.01-1.1.aarch64	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:7zip-0:26.01-1.1.ppc64le	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:7zip-0:26.01-1.1.s390x	—	Vendor Fix
Unresolved product id: openSUSE Tumbleweed:7zip-0:26.01-1.1.x86_64	—	Vendor Fix

Threats

Impact important

References

5 references

URL	Category
https://www.suse.com/support/security/rating/	external
https://ftp.suse.com/pub/projects/security/csaf/o…	self
https://www.suse.com/security/cve/CVE-2026-48095/	self
https://www.suse.com/security/cve/CVE-2026-48095	external
https://bugzilla.suse.com/1267421	external

JSON

To clipboard

{
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  "vulnerabilities": [
    {
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      "ids": [
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          "text": "https://www.suse.com/security/cve/CVE-2026-48095"
        }
      ],
      "notes": [
        {
          "category": "general",
          "text": "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.",
          "title": "CVE description"
        }
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          "openSUSE Tumbleweed:7zip-0:26.01-1.1.ppc64le",
          "openSUSE Tumbleweed:7zip-0:26.01-1.1.s390x",
          "openSUSE Tumbleweed:7zip-0:26.01-1.1.x86_64"
        ]
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        },
        {
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          "summary": "SUSE Bug 1267421 for CVE-2026-48095",
          "url": "https://bugzilla.suse.com/1267421"
        }
      ],
      "remediations": [
        {
          "category": "vendor_fix",
          "details": "To install this SUSE Security Update use the SUSE recommended installation methods like YaST online_update or \"zypper patch\".\n",
          "product_ids": [
            "openSUSE Tumbleweed:7zip-0:26.01-1.1.aarch64",
            "openSUSE Tumbleweed:7zip-0:26.01-1.1.ppc64le",
            "openSUSE Tumbleweed:7zip-0:26.01-1.1.s390x",
            "openSUSE Tumbleweed:7zip-0:26.01-1.1.x86_64"
          ]
        }
      ],
      "scores": [
        {
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            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "products": [
            "openSUSE Tumbleweed:7zip-0:26.01-1.1.aarch64",
            "openSUSE Tumbleweed:7zip-0:26.01-1.1.ppc64le",
            "openSUSE Tumbleweed:7zip-0:26.01-1.1.s390x",
            "openSUSE Tumbleweed:7zip-0:26.01-1.1.x86_64"
          ]
        }
      ],
      "threats": [
        {
          "category": "impact",
          "date": "2026-06-03T00:00:00Z",
          "details": "important"
        }
      ],
      "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 · CISA-ADP (v2.0.3)

Decision recorded 2026-06-08 19:10 UTC

CWE

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

Assigner

GitHub_M mitre root

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.

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.