Vulnerability-Lookup

UBUNTU-CVE-2026-110713 (CVE-2026-110713)

Vulnerability from osv_ubuntu – Published: 2026-10-14 16:17 – Updated: 2026-10-28 17:50 – Source website

Details

libsmb2 through 6.2 contains a heap out-of-bounds read vulnerability in smb2_decode_file_fs_volume_info and smb2_decode_file_fs_attribute_info that allows malicious SMB servers to read past reply buffers. Attackers controlling a server or intercepting unsigned sessions can send crafted QUERY_INFO replies with missing or oversized name lengths to crash the client.

Severity

6.5 (Medium)


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

7.1 (High)


                    
                      CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-110713	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-110713	REPORT
	https://github.com/sahlberg/libsmb2	REPORT
	https://github.com/sahlberg/libsmb2/blob/d67e213a…	REPORT
	https://github.com/sahlberg/libsmb2/commit/dd0bbd…	REPORT
	https://hackmd.io/@haind-pwn/libsmb2-query-info-r…	REPORT
	https://www.vulncheck.com/advisories/libsmb2-thro…	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsmb2-6",
            "binary_version": "6.2+dfsg-4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.10",
        "name": "libsmb2",
        "purl": "pkg:deb/ubuntu/libsmb2@6.2+dfsg-4?arch=source\u0026distro=stonking"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.2+dfsg-3",
        "6.2+dfsg-4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "libsmb2-6",
            "binary_version": "6.2+dfsg-3"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "libsmb2",
        "purl": "pkg:deb/ubuntu/libsmb2@6.2+dfsg-3?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "6.2+dfsg-2",
        "6.2+dfsg-3"
      ]
    }
  ],
  "aliases": [],
  "details": "libsmb2 through 6.2 contains a heap out-of-bounds read vulnerability in smb2_decode_file_fs_volume_info and smb2_decode_file_fs_attribute_info that allows malicious SMB servers to read past reply buffers. Attackers controlling a server or intercepting unsigned sessions can send crafted QUERY_INFO replies with missing or oversized name lengths to crash the client.",
  "id": "UBUNTU-CVE-2026-110713",
  "modified": "2026-10-28T17:50:34Z",
  "published": "2026-10-14T16:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-110713"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-110713"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sahlberg/libsmb2"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-filesystem-info.c#L71"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/sahlberg/libsmb2/commit/dd0bbdee24bb56f7ec95431afc07ce0a666533f7"
    },
    {
      "type": "REPORT",
      "url": "https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-read"
    },
    {
      "type": "REPORT",
      "url": "https://www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-file-system-info-decoders"
    }
  ],
  "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:H",
      "type": "CVSS_V3"
    },
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
      "type": "CVSS_V4"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-110713"
  ]
}

CVE-2026-110713 (GCVE-0-2026-110713)

Vulnerability from cvelistv5 – Published: 2026-10-14 15:01 – Updated: 2026-10-14 19:49

Title

libsmb2 through 6.2 Heap Out-of-Bounds Read via File System Info Decoders

Summary

Severity

7.1 (High)


                        
                          CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

6.5 (Medium)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-10-14 19:48 UTC

CWE

CWE-125 - Out-of-bounds Read

Assigner

VulnCheck CNA under the mitre root

CNA scorecard B 84/100 over 7416 records in the last 180 days details

References

5 references

URL	Tags
https://hackmd.io/@haind-pwn/libsmb2-query-info-r…	technical-descriptionexploit
https://github.com/sahlberg/libsmb2/blob/d67e213a…	technical-description
https://github.com/sahlberg/libsmb2/commit/dd0bbd…	patch
https://github.com/sahlberg/libsmb2	product
https://www.vulncheck.com/advisories/libsmb2-thro…	third-party-advisory

Impacted products

1 product

Vendor	Product	Version
sahlberg	libsmb2	Affected: 0 , ≤ 6.2 (custom)

Date Public

2026-07-28 00:00

Credits

Benjamin Ali HaiND from the Post and Telecommunication Institute of Technology

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-110713",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-10-14T19:48:50.990448Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-10-14T19:49:00.922Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://github.com/sahlberg/libsmb2",
          "defaultStatus": "unaffected",
          "product": "libsmb2",
          "repo": "https://github.com/sahlberg/libsmb2",
          "vendor": "sahlberg",
          "versions": [
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              "lessThanOrEqual": "6.2",
              "status": "affected",
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      "credits": [
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          "lang": "en",
          "type": "finder",
          "value": "Benjamin Ali"
        },
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          "value": "HaiND from the Post and Telecommunication Institute of Technology"
        }
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      "descriptions": [
        {
          "lang": "en",
          "value": "libsmb2 through 6.2 contains a heap out-of-bounds read vulnerability in smb2_decode_file_fs_volume_info and smb2_decode_file_fs_attribute_info that allows malicious SMB servers to read past reply buffers. Attackers controlling a server or intercepting unsigned sessions can send crafted QUERY_INFO replies with missing or oversized name lengths to crash the client."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "attackComplexity": "LOW",
            "attackRequirements": "NONE",
            "attackVector": "NETWORK",
            "baseScore": 7.1,
            "baseSeverity": "HIGH",
            "privilegesRequired": "NONE",
            "subAvailabilityImpact": "NONE",
            "subConfidentialityImpact": "NONE",
            "subIntegrityImpact": "NONE",
            "userInteraction": "PASSIVE",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N",
            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "NONE",
            "vulnIntegrityImpact": "NONE"
          },
          "format": "CVSS"
        },
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "NETWORK",
            "availabilityImpact": "HIGH",
            "baseScore": 6.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          },
          "format": "CVSS"
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      ],
      "problemTypes": [
        {
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              "description": "Out-of-bounds Read",
              "lang": "en",
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      ],
      "providerMetadata": {
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      "references": [
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          "url": "https://hackmd.io/@haind-pwn/libsmb2-query-info-reply-oob-read"
        },
        {
          "tags": [
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          "url": "https://github.com/sahlberg/libsmb2/blob/d67e213a5c4e7e4969fd81f0b95e4ca5831fbba1/lib/smb2-data-filesystem-info.c#L71"
        },
        {
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          "url": "https://github.com/sahlberg/libsmb2/commit/dd0bbdee24bb56f7ec95431afc07ce0a666533f7"
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        {
          "tags": [
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          "url": "https://github.com/sahlberg/libsmb2"
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        {
          "name": "VulnCheck Advisory: libsmb2 through 6.2 Heap Out-of-Bounds Read via File System Info Decoders",
          "tags": [
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          "url": "https://www.vulncheck.com/advisories/libsmb2-through-6.2-heap-out-of-bounds-read-via-file-system-info-decoders"
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  "cveMetadata": {
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    "assignerShortName": "VulnCheck",
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    "datePublished": "2026-10-14T15:01:28.343Z",
    "dateReserved": "2026-10-14T14:39:52.266Z",
    "dateUpdated": "2026-10-14T19:49:00.922Z",
    "state": "PUBLISHED"
  },
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  "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.

Vulnerability timeline

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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.
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