Vulnerability-Lookup

CVE-2026-47667 (GCVE-0-2026-47667)

Vulnerability from cvelistv5 – Published: 2026-07-21 19:57 – Updated: 2026-07-23 14:13

Title

CImg Library: Uncontrolled Memory Allocation and Memory Leak in `_load_analyze()` via Crafted NIfTI/Analyze Header

Summary

CImg Library is a C++ library for image processing. Prior to version 4.0.0 in `_load_analyze()`, the header_size field is read as an `unsigned int` from the first 4 bytes of an Analyze/NIfTI file and passed directly to `new unsigned char[header_size]` without being bounded against the actual file size. A value up to ~4 GB is accepted. If the subsequent `fread` returns `short` as it will for any malformed file), the function throws a `CImgIOException` and the allocated buffer is never freed. A 6-byte crafted file is sufficient to trigger an allocation of ~1.3 GB per call, with the full allocation leaked on every error path. The issue is reachable via `load_analyze()` and the generic `load()` when the file extension is .hdr, .img, or .nii. Version 4.0.0 fixes the issue.

Severity

7.5 (High)


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

SSVC

Exploitation: poc Automatable: yes Technical Impact: partial

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-07-23 14:12 UTC

CWE

CWE-401 - Missing Release of Memory after Effective Lifetime
CWE-789 - Memory Allocation with Excessive Size Value
CWE-1284 - Improper Validation of Specified Quantity in Input

Assigner

GitHub_M mitre root

References

3 references

URL	Tags
https://github.com/GreycLab/CImg/security/advisor…	x_refsource_CONFIRM
https://github.com/GreycLab/CImg/issues/480	x_refsource_MISC
https://github.com/GreycLab/CImg/commit/6a69bf725…	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version	CPE status
GreycLab	CImg	Affected: < 4.0.0	guessed

Show details on NVD website

JSON

To clipboard

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FKIE_CVE-2026-47667

Vulnerability from fkie_nvd - Published: 2026-07-21 20:17 - Updated: 2026-07-23 16:04

Severity

7.5 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

References

	URL	Tags
	security-advisories@github.com	https://github.com/GreycLab/CImg/commit/6a69bf725ffd111a4c7dc61cc15e3661abd158ee
	security-advisories@github.com	https://github.com/GreycLab/CImg/issues/480
	security-advisories@github.com	https://github.com/GreycLab/CImg/security/advisories/GHSA-rmfc-grgj-qwhv
	134c704f-9b21-4f2e-91b3-4a467353bcc0	https://github.com/GreycLab/CImg/issues/480

Impacted products

	Vendor	Product	Version

JSON

To clipboard

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    {
      "affectedData": [
        {
          "product": "CImg",
          "vendor": "GreycLab",
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            {
              "status": "affected",
              "version": "\u003c 4.0.0"
            }
          ]
        }
      ],
      "source": "security-advisories@github.com"
    }
  ],
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    {
      "lang": "en",
      "value": "CImg Library is a C++ library for image processing. Prior to version 4.0.0 in `_load_analyze()`, the header_size field is read as an `unsigned int` from the first 4 bytes of an Analyze/NIfTI file and passed directly to `new unsigned char[header_size]` without being bounded against the actual file size. A value up to ~4 GB is accepted. If the subsequent `fread` returns `short`  as it will for any malformed file), the function throws a `CImgIOException` and the allocated buffer is never freed. A 6-byte crafted file is sufficient to trigger an allocation of ~1.3 GB per call, with the full allocation leaked on every error path. The issue is reachable via `load_analyze()` and the generic `load()` when the file extension is .hdr, .img, or .nii. Version 4.0.0 fixes the issue."
    }
  ],
  "id": "CVE-2026-47667",
  "lastModified": "2026-07-23T16:04:11.740",
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}

UBUNTU-CVE-2026-47667 (CVE-2026-47667)

Vulnerability from osv_ubuntu – Published: 2026-07-21 20:17 – Updated: 2026-07-29 07:58 – Source website

Details

CImg Library is a C++ library for image processing. Prior to version 4.0.0 in _load_analyze(), the header_size field is read as an unsigned int from the first 4 bytes of an Analyze/NIfTI file and passed directly to new unsigned char[header_size] without being bounded against the actual file size. A value up to ~4 GB is accepted. If the subsequent fread returns short as it will for any malformed file), the function throws a CImgIOException and the allocated buffer is never freed. A 6-byte crafted file is sufficient to trigger an allocation of ~1.3 GB per call, with the full allocation leaked on every error path. The issue is reachable via load_analyze() and the generic load() when the file extension is .hdr, .img, or .nii. Version 4.0.0 fixes the issue.

Severity

7.5 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-47667	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-47667	REPORT
	https://github.com/GreycLab/CImg/security/advisor…	REPORT
	https://github.com/GreycLab/CImg/issues/480	REPORT

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{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "cimg-examples",
            "binary_version": "1.6.5+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "cimg",
        "purl": "pkg:deb/ubuntu/cimg@1.6.5+dfsg-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.6.4+dfsg-1build1",
        "1.6.5+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "cimg-examples",
            "binary_version": "1.7.9+dfsg-2ubuntu0.18.04.2+esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:18.04:LTS",
        "name": "cimg",
        "purl": "pkg:deb/ubuntu/cimg@1.7.9+dfsg-2ubuntu0.18.04.2+esm1?arch=source\u0026distro=esm-apps/bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "1.7.9+dfsg-2",
        "1.7.9+dfsg-2build1",
        "1.7.9+dfsg-2ubuntu0.18.04.1",
        "1.7.9+dfsg-2ubuntu0.18.04.2",
        "1.7.9+dfsg-2ubuntu0.18.04.2+esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "cimg-examples",
            "binary_version": "2.4.5+dfsg-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "cimg",
        "purl": "pkg:deb/ubuntu/cimg@2.4.5+dfsg-1?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.4.5+dfsg-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "cimg-examples",
            "binary_version": "2.9.4+dfsg-3ubuntu0.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:22.04:LTS",
        "name": "cimg",
        "purl": "pkg:deb/ubuntu/cimg@2.9.4+dfsg-3ubuntu0.1~esm1?arch=source\u0026distro=esm-apps/jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "2.9.4+dfsg-2",
        "2.9.4+dfsg-3",
        "2.9.4+dfsg-3ubuntu0.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "cimg-examples",
            "binary_version": "3.2.1+dfsg-1ubuntu0.24.04.1~esm1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:Pro:24.04:LTS",
        "name": "cimg",
        "purl": "pkg:deb/ubuntu/cimg@3.2.1+dfsg-1ubuntu0.24.04.1~esm1?arch=source\u0026distro=esm-apps/noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.2.1+dfsg-1",
        "3.2.1+dfsg-1ubuntu0.24.04.1~esm1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "cimg-examples",
            "binary_version": "3.5.2+dfsg-1build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "cimg",
        "purl": "pkg:deb/ubuntu/cimg@3.5.2+dfsg-1build1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5.2+dfsg-1",
        "3.5.2+dfsg-1build1"
      ]
    }
  ],
  "aliases": [],
  "details": "CImg Library is a C++ library for image processing. Prior to version 4.0.0 in `_load_analyze()`, the header_size field is read as an `unsigned int` from the first 4 bytes of an Analyze/NIfTI file and passed directly to `new unsigned char[header_size]` without being bounded against the actual file size. A value up to ~4 GB is accepted. If the subsequent `fread` returns `short`  as it will for any malformed file), the function throws a `CImgIOException` and the allocated buffer is never freed. A 6-byte crafted file is sufficient to trigger an allocation of ~1.3 GB per call, with the full allocation leaked on every error path. The issue is reachable via `load_analyze()` and the generic `load()` when the file extension is .hdr, .img, or .nii. Version 4.0.0 fixes the issue.",
  "id": "UBUNTU-CVE-2026-47667",
  "modified": "2026-07-29T07:58:06Z",
  "published": "2026-07-21T20:17:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-47667"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-47667"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/GreycLab/CImg/security/advisories/GHSA-rmfc-grgj-qwhv"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/GreycLab/CImg/issues/480"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-47667"
  ]
}

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.

Action not permitted

CVE-2026-47667 (GCVE-0-2026-47667)

FKIE_CVE-2026-47667

UBUNTU-CVE-2026-47667 (CVE-2026-47667)

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Sightings

Nomenclature

Related by attack behaviour