Vulnerability-Lookup

GHSA-6Q56-MRMC-CPH4

Vulnerability from github – Published: 2026-01-13 00:30 – Updated: 2026-01-13 00:30

Details

Ollama 0.11.5-rc0 through current version 0.13.5 contain a null pointer dereference vulnerability in the multi-modal model image processing functionality. When processing base64-encoded image data via the /api/chat endpoint, the application fails to validate that the decoded data represents valid media before passing it to the mtmd_helper_bitmap_init_from_buf function. This function can return NULL for malformed input, but the code does not check this return value before dereferencing the pointer in subsequent operations. A remote attacker can exploit this by sending specially crafted base64 image data that decodes to invalid media, causing a segmentation fault and crashing the runner process. This results in a denial of service condition where the model becomes unavailable to all users until the service is restarted.

Severity ?

8.7 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2025-15514"
  ],
  "database_specific": {
    "cwe_ids": [
      "CWE-395"
    ],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-01-12T23:15:51Z",
    "severity": "HIGH"
  },
  "details": "Ollama 0.11.5-rc0 through current version 0.13.5 contain a null pointer dereference vulnerability in the multi-modal model image processing functionality. When processing base64-encoded image data via the /api/chat endpoint, the application fails to validate that the decoded data represents valid media before passing it to the mtmd_helper_bitmap_init_from_buf function. This function can return NULL for malformed input, but the code does not check this return value before dereferencing the pointer in subsequent operations. A remote attacker can exploit this by sending specially crafted base64 image data that decodes to invalid media, causing a segmentation fault and crashing the runner process. This results in a denial of service condition where the model becomes unavailable to all users until the service is restarted.",
  "id": "GHSA-6q56-mrmc-cph4",
  "modified": "2026-01-13T00:30:46Z",
  "published": "2026-01-13T00:30:46Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2025-15514"
    },
    {
      "type": "WEB",
      "url": "https://https://github.com/ollama/ollama"
    },
    {
      "type": "WEB",
      "url": "https://huntr.com/bounties/172df98b-07cd-41ea-a628-366f8cd525c0"
    },
    {
      "type": "WEB",
      "url": "https://ollama.com"
    },
    {
      "type": "WEB",
      "url": "https://www.vulncheck.com/advisories/ollama-multi-modal-image-processing-null-pointer-dereference"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/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-2025-15514 (GCVE-0-2025-15514)

Vulnerability from cvelistv5 – Published: 2026-01-12 23:03 – Updated: 2026-01-13 17:19

Title

Ollama Multi-Modal Model Image Processing NULL Pointer Dereference

Summary

Severity ?

8.7 (High)


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

CWE

CWE-395 - Use of NullPointerException Catch to Detect NULL Pointer Dereference

Assigner

VulnCheck

References

URL

Tags

	https://huntr.com/bounties/172df98b-07cd-41ea-a62…	technical-descriptionexploit
	https://ollama.com/	product
	https://https://github.com/ollama/ollama	product
	https://www.vulncheck.com/advisories/ollama-multi…	third-party-advisory

Impacted products

	Vendor	Product	Version
	Ollama	Ollama	Affected: v0.11.5-rc0 , ≤ 0.13.5 (semver)

Credits

Weblover

Show details on NVD website

JSON

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Sightings

Author	Source	Type	Date

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-6Q56-MRMC-CPH4

CVE-2025-15514 (GCVE-0-2025-15514)

Tags

Sightings

Nomenclature