Vulnerability-Lookup

UBUNTU-CVE-2026-42146 (CVE-2026-42146)

Vulnerability from osv_ubuntu – Published: 2026-05-04 18:16 – Updated: 2026-05-20 15:27 – Source website

Details

CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.

Severity

5.5 (Medium)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-42146	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-42146	REPORT
	https://github.com/GreycLab/CImg/security/advisor…	REPORT
	https://github.com/GreycLab/CImg/issues/477	REPORT

JSON

To clipboard

{
  "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-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:25.10",
        "name": "cimg",
        "purl": "pkg:deb/ubuntu/cimg@3.5.2+dfsg-1?arch=source\u0026distro=questing"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "3.5.2+dfsg-1"
      ]
    },
    {
      "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 commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5.",
  "id": "UBUNTU-CVE-2026-42146",
  "modified": "2026-05-20T15:27:27Z",
  "published": "2026-05-04T18:16:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-42146"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-42146"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/GreycLab/CImg/security/advisories/GHSA-g54r-qmgx-c6fv"
    },
    {
      "type": "REPORT",
      "url": "https://github.com/GreycLab/CImg/issues/477"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-42146"
  ]
}

CVE-2026-42146 (GCVE-0-2026-42146)

Vulnerability from cvelistv5 – Published: 2026-05-04 17:53 – Updated: 2026-05-06 13:44

Title

CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp

Summary

Severity

5.5 (Medium)


                        
                          CVSS:3.1/AV:L/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 2026-05-06 13:43 UTC

CWE

CWE-789 - Memory Allocation with Excessive Size Value

Assigner

GitHub_M mitre root Scorecard

References

4 references

URL	Tags
https://github.com/GreycLab/CImg/security/advisor…	x_refsource_CONFIRM
https://github.com/GreycLab/CImg/issues/477	x_refsource_MISC
https://github.com/GreycLab/CImg/commit/c3aacf5b9…	x_refsource_MISC
https://github.com/GreycLab/CImg/releases/tag/v.3.7.5	x_refsource_MISC

Impacted products

1 product

Vendor	Product	Version
GreycLab	CImg	Affected: < c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-42146",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "partial"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-05-06T13:43:28.189688Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
            }
          }
        ],
        "providerMetadata": {
          "dateUpdated": "2026-05-06T13:44:14.581Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://github.com/GreycLab/CImg/issues/477"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "product": "CImg",
          "vendor": "GreycLab",
          "versions": [
            {
              "status": "affected",
              "version": "\u003c c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "CImg Library is a C++ library for image processing. Prior to commit c3aacf5, the nb_colors field read from the BMP file header is used directly to compute an allocation size without validating it against the remaining file size. A crafted BMP file with a large nb_colors value triggers an out-of-memory condition, crashing any application that uses CImg to load untrusted BMP files. This issue has been patched via commit c3aacf5."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "attackComplexity": "LOW",
            "attackVector": "LOCAL",
            "availabilityImpact": "HIGH",
            "baseScore": 5.5,
            "baseSeverity": "MEDIUM",
            "confidentialityImpact": "NONE",
            "integrityImpact": "NONE",
            "privilegesRequired": "NONE",
            "scope": "UNCHANGED",
            "userInteraction": "REQUIRED",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H",
            "version": "3.1"
          }
        }
      ],
      "problemTypes": [
        {
          "descriptions": [
            {
              "cweId": "CWE-789",
              "description": "CWE-789: Memory Allocation with Excessive Size Value",
              "lang": "en",
              "type": "CWE"
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-04T17:53:23.830Z",
        "orgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
        "shortName": "GitHub_M"
      },
      "references": [
        {
          "name": "https://github.com/GreycLab/CImg/security/advisories/GHSA-g54r-qmgx-c6fv",
          "tags": [
            "x_refsource_CONFIRM"
          ],
          "url": "https://github.com/GreycLab/CImg/security/advisories/GHSA-g54r-qmgx-c6fv"
        },
        {
          "name": "https://github.com/GreycLab/CImg/issues/477",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/GreycLab/CImg/issues/477"
        },
        {
          "name": "https://github.com/GreycLab/CImg/commit/c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/GreycLab/CImg/commit/c3aacf5b96ac1e54b7af1957c6737dbf3949f6d3"
        },
        {
          "name": "https://github.com/GreycLab/CImg/releases/tag/v.3.7.5",
          "tags": [
            "x_refsource_MISC"
          ],
          "url": "https://github.com/GreycLab/CImg/releases/tag/v.3.7.5"
        }
      ],
      "source": {
        "advisory": "GHSA-g54r-qmgx-c6fv",
        "discovery": "UNKNOWN"
      },
      "title": "CImg Library: Uncontrolled memory allocation via nb_colors field in _load_bmp"
    }
  },
  "cveMetadata": {
    "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa",
    "assignerShortName": "GitHub_M",
    "cveId": "CVE-2026-42146",
    "datePublished": "2026-05-04T17:53:23.830Z",
    "dateReserved": "2026-04-24T17:15:21.834Z",
    "dateUpdated": "2026-05-06T13:44:14.581Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Confirmed: The vulnerability has been validated from an analyst's perspective.
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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.

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

UBUNTU-CVE-2026-42146 (CVE-2026-42146)

CVE-2026-42146 (GCVE-0-2026-42146)

Tags

Sightings

Nomenclature

Related by attack behaviour