Vulnerability-Lookup

GHSA-C2Q9-58W2-GJG4

Vulnerability from github – Published: 2026-09-07 09:31 – Updated: 2026-09-07 09:31

Details

A vulnerability was found in Ollama up to 0.31.1. This issue affects the function readGGUFV1String of the file fs/ggml/gguf.go of the component GGUF Decoder. Performing a manipulation results in integer overflow. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 0.31.2-rc1 is capable of addressing this issue. The patch is named 67b6a1c2d45321e0cb3c04a18073f9818de7724b. It is recommended to upgrade the affected component.

Severity

4.3 (Medium)


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

2.1 (Low)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-86289"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-07T09:17:17Z",
    "severity": "LOW"
  },
  "details": "A vulnerability was found in Ollama up to 0.31.1. This issue affects the function readGGUFV1String of the file fs/ggml/gguf.go of the component GGUF Decoder. Performing a manipulation results in integer overflow. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 0.31.2-rc1 is capable of addressing this issue. The patch is named 67b6a1c2d45321e0cb3c04a18073f9818de7724b. It is recommended to upgrade the affected component.",
  "id": "GHSA-c2q9-58w2-gjg4",
  "modified": "2026-09-07T09:31:40Z",
  "published": "2026-09-07T09:31:40Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-86289"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ollama/ollama/issues/17033"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ollama/ollama/pull/17062"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ollama/ollama/commit/67b6a1c2d45321e0cb3c04a18073f9818de7724b"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ollama/ollama"
    },
    {
      "type": "WEB",
      "url": "https://github.com/ollama/ollama/releases/tag/v0.31.2-rc1"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/cve/CVE-2026-86289"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/submit/906136"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/399448"
    },
    {
      "type": "WEB",
      "url": "https://vuldb.com/vuln/399448/cti"
    }
  ],
  "schema_version": "1.4.0",
  "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:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
      "type": "CVSS_V4"
    }
  ]
}

CVE-2026-86289 (GCVE-0-2026-86289)

Vulnerability from cvelistv5 – Published: 2026-09-07 08:45 – Updated: 2026-09-07 08:45 X_Open Source

Title

Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow

Summary

Severity

5.3 (Medium)


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

4.3 (Medium)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

4.3 (Medium)


                        
                          CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C

CWE

CWE-190 - Integer Overflow
CWE-189 - Numeric Error

Assigner

VulDB mitre root

References

9 references

URL	Tags
https://vuldb.com/vuln/399448	vdb-entrytechnical-description
https://vuldb.com/vuln/399448/cti	signaturepermissions-required
https://vuldb.com/cve/CVE-2026-86289	third-party-advisory
https://vuldb.com/submit/906136	third-party-advisory
https://github.com/ollama/ollama/issues/17033	exploitissue-tracking
https://github.com/ollama/ollama/pull/17062	issue-trackingpatch
https://github.com/ollama/ollama/commit/67b6a1c2d…	patch
https://github.com/ollama/ollama/releases/tag/v0.…	patch
https://github.com/ollama/ollama/	product

Impacted products

1 product

Vendor	Product	Version
n/a	Ollama	Affected: 0.31.0 Affected: 0.31.1 Unaffected: 0.31.2-rc1 cpe:2.3:a:ollama:ollama::::::::

Credits

m00dy (VulDB User)

Show details on NVD website

JSON

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{
  "containers": {
    "cna": {
      "affected": [
        {
          "cpes": [
            "cpe:2.3:a:ollama:ollama:*:*:*:*:*:*:*:*"
          ],
          "modules": [
            "GGUF Decoder"
          ],
          "product": "Ollama",
          "vendor": "n/a",
          "versions": [
            {
              "status": "affected",
              "version": "0.31.0"
            },
            {
              "status": "affected",
              "version": "0.31.1"
            },
            {
              "status": "unaffected",
              "version": "0.31.2-rc1"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "reporter",
          "value": "m00dy (VulDB User)"
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "A vulnerability was found in Ollama up to 0.31.1. This issue affects the function readGGUFV1String of the file fs/ggml/gguf.go of the component GGUF Decoder. Performing a manipulation results in integer overflow. The attack is possible to be carried out remotely. The exploit has been made public and could be used. Upgrading to version 0.31.2-rc1 is capable of addressing this issue. The patch is named 67b6a1c2d45321e0cb3c04a18073f9818de7724b. It is recommended to upgrade the affected component."
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "baseScore": 5.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:P",
            "version": "4.0"
          }
        },
        {
          "cvssV3_1": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C",
            "version": "3.1"
          }
        },
        {
          "cvssV3_0": {
            "baseScore": 4.3,
            "baseSeverity": "MEDIUM",
            "vectorString": "CVSS:3.0/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:L/E:P/RL:O/RC:C",
            "version": "3.0"
          }
        },
        {
          "cvssV2_0": {
            "baseScore": 5,
            "vectorString": "AV:N/AC:L/Au:N/C:N/I:N/A:P/E:POC/RL:OF/RC:C",
            "version": "2.0"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-190",
              "description": "Integer Overflow",
              "lang": "en",
              "type": "CWE"
            }
          ]
        },
        {
          "descriptions": [
            {
              "cweId": "CWE-189",
              "description": "Numeric Error",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-07T08:45:15.290Z",
        "orgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
        "shortName": "VulDB"
      },
      "references": [
        {
          "name": "VDB-399448 | Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow",
          "tags": [
            "vdb-entry",
            "technical-description"
          ],
          "url": "https://vuldb.com/vuln/399448"
        },
        {
          "name": "VDB-399448 | CTI Indicators (IOB, IOC, IOA)",
          "tags": [
            "signature",
            "permissions-required"
          ],
          "url": "https://vuldb.com/vuln/399448/cti"
        },
        {
          "name": "CVE-2026-86289 | CVE Analysis and Report",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/cve/CVE-2026-86289"
        },
        {
          "name": "Submit #906136 | Ollama     \u003c= 0.17.1 Integer Overflow",
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://vuldb.com/submit/906136"
        },
        {
          "tags": [
            "exploit",
            "issue-tracking"
          ],
          "url": "https://github.com/ollama/ollama/issues/17033"
        },
        {
          "tags": [
            "issue-tracking",
            "patch"
          ],
          "url": "https://github.com/ollama/ollama/pull/17062"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/ollama/ollama/commit/67b6a1c2d45321e0cb3c04a18073f9818de7724b"
        },
        {
          "tags": [
            "patch"
          ],
          "url": "https://github.com/ollama/ollama/releases/tag/v0.31.2-rc1"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://github.com/ollama/ollama/"
        }
      ],
      "tags": [
        "x_open-source"
      ],
      "timeline": [
        {
          "lang": "en",
          "time": "2026-09-06T00:00:00.000Z",
          "value": "Advisory disclosed"
        },
        {
          "lang": "en",
          "time": "2026-09-06T02:00:00.000Z",
          "value": "VulDB entry created"
        },
        {
          "lang": "en",
          "time": "2026-09-06T17:49:13.000Z",
          "value": "VulDB entry last update"
        }
      ],
      "title": "Ollama GGUF Decoder gguf.go readGGUFV1String integer overflow",
      "x_generator": [
        "VulDB PVTS v202609"
      ]
    }
  },
  "cveMetadata": {
    "assignerOrgId": "1af790b2-7ee1-4545-860a-a788eba489b5",
    "assignerShortName": "VulDB",
    "cveId": "CVE-2026-86289",
    "datePublished": "2026-09-07T08:45:15.290Z",
    "dateReserved": "2026-09-06T15:44:05.664Z",
    "dateUpdated": "2026-09-07T08:45:15.290Z",
    "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.

Action not permitted

GHSA-C2Q9-58W2-GJG4

CVE-2026-86289 (GCVE-0-2026-86289)

Tags

Sightings

Nomenclature