Vulnerability-Lookup

GHSA-5FJH-WJGP-25PH

Vulnerability from github – Published: 2026-04-29 12:33 – Updated: 2026-04-29 12:33

Details

Critically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.

Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.

Severity ?

7.7 (High)


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

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JSON

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{
  "affected": [],
  "aliases": [
    "CVE-2026-42248"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-494"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-04-29T12:16:18Z",
    "severity": "HIGH"
  },
  "details": "Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker\u2011supplied executables to be accepted and later executed by the application.\n\nCritically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.\n\nMaintainers of this project were notified early about this vulnerability, but didn\u0027t respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.",
  "id": "GHSA-5fjh-wjgp-25ph",
  "modified": "2026-04-29T12:33:07Z",
  "published": "2026-04-29T12:33:07Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-42248"
    },
    {
      "type": "WEB",
      "url": "https://cert.pl/en/posts/2026/04/CVE-2026-42248"
    },
    {
      "type": "WEB",
      "url": "https://ollama.com"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:A/AC:L/AT:P/PR:N/UI:N/VC:H/VI:H/VA:H/SC:L/SI:L/SA:L/E:X/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-2026-42248 (GCVE-0-2026-42248)

Vulnerability from cvelistv5 – Published: 2026-04-29 11:44 – Updated: 2026-04-29 13:23 X_Open Source

Title

Missing Signature Verification for Updates in Ollama

Summary

Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker‑supplied executables to be accepted and later executed by the application. Critically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness. Maintainers of this project were notified early about this vulnerability, but didn't respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.

Severity ?

7.7 (High)


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

CWE

CWE-494 - Download of Code Without Integrity Check

Assigner

CERT-PL

References

URL

Tags

	https://cert.pl/en/posts/2026/04/CVE-2026-42248/	third-party-advisory
	https://ollama.com/	product

Impacted products

	Vendor	Product	Version
	Ollama	Ollama	Affected: 0.12.10 , ≤ 0.17.5 (semver)

Credits

Bartłomiej Dmitruk (striga.ai)

Show details on NVD website

JSON

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{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42248",
                "options": [
                  {
                    "Exploitation": "none"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-04-29T13:21:11.854543Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-04-29T13:23:07.650Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unknown",
          "platforms": [
            "Windows"
          ],
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          "repo": "https://github.com/ollama/ollama",
          "vendor": "Ollama",
          "versions": [
            {
              "lessThanOrEqual": "0.17.5",
              "status": "affected",
              "version": "0.12.10",
              "versionType": "semver"
            }
          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "type": "finder",
          "value": "Bart\u0142omiej Dmitruk (striga.ai)"
        }
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      "descriptions": [
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              "base64": false,
              "type": "text/html",
              "value": "Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker\u2011supplied executables to be accepted and later executed by the application.\u003cbr\u003e\u003cbr\u003e\u003cspan style=\"background-color: rgb(255, 255, 255);\"\u003eCritically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.\u003c/span\u003e\u003cbr\u003e\u003cbr\u003eMaintainers of this project were notified early about this vulnerability, but didn\u0027t respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable.\u003cbr\u003e"
            }
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          "value": "Ollama for Windows does not perform integrity or authenticity verification of downloaded update executables. Unlike other platforms, the Windows implementation of the update verification routine unconditionally returns success so no digital signature or trust validation is performed before staging or executing update payloads, enabling attacker\u2011supplied executables to be accepted and later executed by the application.\n\nCritically, Ollama for Windows performs silent automatic updates, so the malicious payload may be installed automatically without user awareness.\n\nMaintainers of this project were notified early about this vulnerability, but didn\u0027t respond with the details of vulnerability or vulnerable version range. Versions from 0.12.10 to 0.17.5 were tested and confirmed as vulnerable, other versions were not tested but might also be vulnerable."
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      ],
      "impacts": [
        {
          "capecId": "CAPEC-186",
          "descriptions": [
            {
              "lang": "en",
              "value": "CAPEC-186 Malicious Software Update"
            }
          ]
        }
      ],
      "metrics": [
        {
          "cvssV4_0": {
            "Automatable": "NOT_DEFINED",
            "Recovery": "NOT_DEFINED",
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            "valueDensity": "NOT_DEFINED",
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            "version": "4.0",
            "vulnAvailabilityImpact": "HIGH",
            "vulnConfidentialityImpact": "HIGH",
            "vulnIntegrityImpact": "HIGH",
            "vulnerabilityResponseEffort": "NOT_DEFINED"
          },
          "format": "CVSS",
          "scenarios": [
            {
              "lang": "en",
              "value": "GENERAL"
            }
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      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-494",
              "description": "CWE-494: Download of Code Without Integrity Check",
              "lang": "en",
              "type": "CWE"
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          ]
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      ],
      "providerMetadata": {
        "dateUpdated": "2026-04-29T11:44:33.770Z",
        "orgId": "4bb8329e-dd38-46c1-aafb-9bf32bcb93c6",
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      },
      "references": [
        {
          "tags": [
            "third-party-advisory"
          ],
          "url": "https://cert.pl/en/posts/2026/04/CVE-2026-42248/"
        },
        {
          "tags": [
            "product"
          ],
          "url": "https://ollama.com/"
        }
      ],
      "source": {
        "discovery": "EXTERNAL"
      },
      "tags": [
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      ],
      "title": "Missing Signature Verification for Updates in Ollama",
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    "dateReserved": "2026-04-25T11:31:56.229Z",
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    "state": "PUBLISHED"
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}

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

GHSA-5FJH-WJGP-25PH

CVE-2026-42248 (GCVE-0-2026-42248)

Tags

Sightings

Nomenclature