Vulnerability-Lookup

ubuntu-cve-2026-77652

Vulnerability from osv_ubuntu

Published

2026-08-26 20:18

Modified

2026-09-02 16:27

Summary

Details

A heap-based buffer overflow vulnerability exists in the Dia diagram editor WPG file format importer. In plug-ins/wpg/wpg-import.c, the WPG import renderer allocates a fixed palette with: ren->pPal = g_new0(WPGColorRGB, 256); When handling a WPG_COLORMAP record, the parser reads a start index (i16) and number of colors (iNum16) from the file and reads palette data with: bRet &= (iNum16 == (int)fread(&ren->pPal[i16], sizeof(WPGColorRGB), iNum16, f)); The only bounds-related check is if (i16 >= 0 && i16 <= iSize), where iSize is the WPG record size—not the palette capacity. There is no validation that i16 is less than 256 or that i16 + iNum16 does not exceed 256. A malicious WPG file can supply i16=256 and iNum16=264. That causes fread() to write 792 bytes starting at &pPal[256], while the palette buffer is only 768 bytes (256 entries × 3 bytes). This overflows into adjacent heap metadata and can crash Dia (SIGABRT / malloc corruption errors) or, depending on heap layout and exploit primitives, potentially lead to arbitrary code execution. Exploitation requires convincing a user to open a crafted WPG file via Dia's file dialog, command line, or file association. No special privileges are required to deliver the file to the victim. Affected component: WPG parser (plug-ins/wpg/wpg-import.c). Affected versions: all Dia versions containing this code path (reporter tested Dia 0.98+git20260221-1; issue present on upstream master as of 2026-08-21).

Severity

7.8 (High)


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

N/A (UNKNOWN)


                    
                      medium

References

URL

Type

	https://ubuntu.com/security/CVE-2026-77652	REPORT
	https://www.cve.org/CVERecord?id=CVE-2026-77652	REPORT
	https://gitlab.gnome.org/GNOME/dia/-/issues/580	REPORT

JSON

To clipboard

{
  "affected": [
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dia",
            "binary_version": "0.97.3-1"
          },
          {
            "binary_name": "dia-common",
            "binary_version": "0.97.3-1"
          },
          {
            "binary_name": "dia-gnome",
            "binary_version": "0.97.3-1"
          },
          {
            "binary_name": "dia-libs",
            "binary_version": "0.97.3-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:16.04:LTS",
        "name": "dia",
        "purl": "pkg:deb/ubuntu/dia@0.97.3-1?arch=source\u0026distro=xenial"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.97.3-1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dia",
            "binary_version": "0.97.3+git20160930-8"
          },
          {
            "binary_name": "dia-common",
            "binary_version": "0.97.3+git20160930-8"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:18.04:LTS",
        "name": "dia",
        "purl": "pkg:deb/ubuntu/dia@0.97.3+git20160930-8?arch=source\u0026distro=bionic"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.97.3+git20160930-6",
        "0.97.3+git20160930-7",
        "0.97.3+git20160930-8"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dia",
            "binary_version": "0.97.3+git20160930-9"
          },
          {
            "binary_name": "dia-common",
            "binary_version": "0.97.3+git20160930-9"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:20.04:LTS",
        "name": "dia",
        "purl": "pkg:deb/ubuntu/dia@0.97.3+git20160930-9?arch=source\u0026distro=focal"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.97.3+git20160930-8.1",
        "0.97.3+git20160930-8.2",
        "0.97.3+git20160930-9"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dia",
            "binary_version": "0.97.3+git20160930-9build1"
          },
          {
            "binary_name": "dia-common",
            "binary_version": "0.97.3+git20160930-9build1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:22.04:LTS",
        "name": "dia",
        "purl": "pkg:deb/ubuntu/dia@0.97.3+git20160930-9build1?arch=source\u0026distro=jammy"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.97.3+git20160930-9",
        "0.97.3+git20160930-9build1"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dia",
            "binary_version": "0.98+git20240130-1build4"
          },
          {
            "binary_name": "dia-common",
            "binary_version": "0.98+git20240130-1build4"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:24.04:LTS",
        "name": "dia",
        "purl": "pkg:deb/ubuntu/dia@0.98+git20240130-1build4?arch=source\u0026distro=noble"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.97.3+git20220525-5build1",
        "0.97.3+git20220525-5build2",
        "0.97.3+git20220525-5build3",
        "0.98+git20240130-1",
        "0.98+git20240130-1build2",
        "0.98+git20240130-1build3",
        "0.98+git20240130-1build4"
      ]
    },
    {
      "ecosystem_specific": {
        "binaries": [
          {
            "binary_name": "dia",
            "binary_version": "0.98+git20260221-1"
          },
          {
            "binary_name": "dia-common",
            "binary_version": "0.98+git20260221-1"
          }
        ]
      },
      "package": {
        "ecosystem": "Ubuntu:26.04:LTS",
        "name": "dia",
        "purl": "pkg:deb/ubuntu/dia@0.98+git20260221-1?arch=source\u0026distro=resolute"
      },
      "ranges": [
        {
          "events": [
            {
              "introduced": "0"
            }
          ],
          "type": "ECOSYSTEM"
        }
      ],
      "versions": [
        "0.98+git20250902-0ubuntu1",
        "0.98+git20250902-0ubuntu2",
        "0.98+git20260221-1"
      ]
    }
  ],
  "aliases": [],
  "details": "A heap-based buffer overflow vulnerability exists in the Dia diagram editor WPG file format importer. In plug-ins/wpg/wpg-import.c, the WPG import renderer allocates a fixed palette with:     ren-\u003epPal = g_new0(WPGColorRGB, 256); When handling a WPG_COLORMAP record, the parser reads a start index (i16) and number of colors (iNum16) from the file and reads palette data with:     bRet \u0026= (iNum16 == (int)fread(\u0026ren-\u003epPal[i16], sizeof(WPGColorRGB), iNum16, f)); The only bounds-related check is `if (i16 \u003e= 0 \u0026\u0026 i16 \u003c= iSize)`, where iSize is the WPG record size\u2014not the palette capacity. There is no validation that i16 is less than 256 or that i16 + iNum16 does not exceed 256. A malicious WPG file can supply i16=256 and iNum16=264. That causes fread() to write 792 bytes starting at \u0026pPal[256], while the palette buffer is only 768 bytes (256 entries \u00d7 3 bytes). This overflows into adjacent heap metadata and can crash Dia (SIGABRT / malloc corruption errors) or, depending on heap layout and exploit primitives, potentially lead to arbitrary code execution. Exploitation requires convincing a user to open a crafted WPG file via Dia\u0027s file dialog, command line, or file association. No special privileges are required to deliver the file to the victim. Affected component: WPG parser (plug-ins/wpg/wpg-import.c). Affected versions: all Dia versions containing this code path (reporter tested Dia 0.98+git20260221-1; issue present on upstream master as of 2026-08-21).",
  "id": "UBUNTU-CVE-2026-77652",
  "modified": "2026-09-02T16:27:47Z",
  "published": "2026-08-26T20:18:00Z",
  "references": [
    {
      "type": "REPORT",
      "url": "https://ubuntu.com/security/CVE-2026-77652"
    },
    {
      "type": "REPORT",
      "url": "https://www.cve.org/CVERecord?id=CVE-2026-77652"
    },
    {
      "type": "REPORT",
      "url": "https://gitlab.gnome.org/GNOME/dia/-/issues/580"
    }
  ],
  "related": [],
  "schema_version": "1.7.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    },
    {
      "score": "medium",
      "type": "Ubuntu"
    }
  ],
  "upstream": [
    "CVE-2026-77652"
  ]
}

CVE-2026-77652 (GCVE-0-2026-77652)

Vulnerability from cvelistv5 – Published: 2026-08-26 19:21 – Updated: 2026-08-27 14:43

Title

Dia: dia: heap buffer overflow in wpg colormap parser via out-of-bounds palette index

Summary

A heap-based buffer overflow vulnerability exists in the Dia diagram editor WPG file format importer. In plug-ins/wpg/wpg-import.c, the WPG import renderer allocates a fixed palette with: ren->pPal = g_new0(WPGColorRGB, 256); When handling a WPG_COLORMAP record, the parser reads a start index (i16) and number of colors (iNum16) from the file and reads palette data with: bRet &= (iNum16 == (int)fread(&ren->pPal[i16], sizeof(WPGColorRGB), iNum16, f)); The only bounds-related check is `if (i16 >= 0 && i16 <= iSize)`, where iSize is the WPG record size—not the palette capacity. There is no validation that i16 is less than 256 or that i16 + iNum16 does not exceed 256. A malicious WPG file can supply i16=256 and iNum16=264. That causes fread() to write 792 bytes starting at &pPal[256], while the palette buffer is only 768 bytes (256 entries × 3 bytes). This overflows into adjacent heap metadata and can crash Dia (SIGABRT / malloc corruption errors) or, depending on heap layout and exploit primitives, potentially lead to arbitrary code execution. Exploitation requires convincing a user to open a crafted WPG file via Dia's file dialog, command line, or file association. No special privileges are required to deliver the file to the victim. Affected component: WPG parser (plug-ins/wpg/wpg-import.c). Affected versions: all Dia versions containing this code path (reporter tested Dia 0.98+git20260221-1; issue present on upstream master as of 2026-08-21).

Severity

7.8 (High)


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

SSVC

Exploitation: poc Automatable: no Technical Impact: total

CISA Coordinator · CISA-ADP (v2.0.3)

Decision recorded 2026-08-27 14:42 UTC

CWE

CWE-122 - Heap-based Buffer Overflow

Assigner

fedora redhat root

References

4 references

URL	Tags
https://access.redhat.com/security/cve/CVE-2026-77652	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2520884	issue-trackingx_refsource_REDHAT
https://gitlab.gnome.org/GNOME/dia/-/blob/master/…
https://gitlab.gnome.org/GNOME/dia/-/issues/580

Impacted products

1 product

Vendor	Product	Version
GNOME	Dia	Affected: 0 , ≤ 0.98+git20260221-1 (semver)

Date Public

2026-08-21 00:00

Credits

Red Hat would like to thank Robin "drzobin" Larsson for reporting this issue.

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "adp": [
      {
        "metrics": [
          {
            "other": {
              "content": {
                "id": "CVE-2026-77652",
                "options": [
                  {
                    "Exploitation": "poc"
                  },
                  {
                    "Automatable": "no"
                  },
                  {
                    "Technical Impact": "total"
                  }
                ],
                "role": "CISA Coordinator",
                "timestamp": "2026-08-27T14:42:56.357247Z",
                "version": "2.0.3"
              },
              "type": "ssvc"
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        ],
        "providerMetadata": {
          "dateUpdated": "2026-08-27T14:43:23.737Z",
          "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
          "shortName": "CISA-ADP"
        },
        "references": [
          {
            "tags": [
              "exploit"
            ],
            "url": "https://gitlab.gnome.org/GNOME/dia/-/issues/580"
          }
        ],
        "title": "CISA ADP Vulnrichment"
      }
    ],
    "cna": {
      "affected": [
        {
          "collectionURL": "https://gitlab.gnome.org/GNOME/dia/-/issues/580",
          "defaultStatus": "unaffected",
          "packageName": "dia",
          "product": "Dia",
          "vendor": "GNOME",
          "versions": [
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              "version": "0",
              "versionType": "semver"
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          ]
        }
      ],
      "credits": [
        {
          "lang": "en",
          "value": "Red Hat would like to thank Robin \"drzobin\" Larsson for reporting this issue."
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      ],
      "datePublic": "2026-08-21T00:00:00.000Z",
      "descriptions": [
        {
          "lang": "en",
          "value": "A heap-based buffer overflow vulnerability exists in the Dia diagram editor WPG file format importer.\n\nIn plug-ins/wpg/wpg-import.c, the WPG import renderer allocates a fixed palette with:\n\n    ren-\u003epPal = g_new0(WPGColorRGB, 256);\n\nWhen handling a WPG_COLORMAP record, the parser reads a start index (i16) and number of colors (iNum16) from the file and reads palette data with:\n\n    bRet \u0026= (iNum16 == (int)fread(\u0026ren-\u003epPal[i16], sizeof(WPGColorRGB), iNum16, f));\n\nThe only bounds-related check is `if (i16 \u003e= 0 \u0026\u0026 i16 \u003c= iSize)`, where iSize is the WPG record size\u2014not the palette capacity. There is no validation that i16 is less than 256 or that i16 + iNum16 does not exceed 256.\n\nA malicious WPG file can supply i16=256 and iNum16=264. That causes fread() to write 792 bytes starting at \u0026pPal[256], while the palette buffer is only 768 bytes (256 entries \u00d7 3 bytes). This overflows into adjacent heap metadata and can crash Dia (SIGABRT / malloc corruption errors) or, depending on heap layout and exploit primitives, potentially lead to arbitrary code execution.\n\nExploitation requires convincing a user to open a crafted WPG file via Dia\u0027s file dialog, command line, or file association. No special privileges are required to deliver the file to the victim.\n\nAffected component: WPG parser (plug-ins/wpg/wpg-import.c).\nAffected versions: all Dia versions containing this code path (reporter tested Dia 0.98+git20260221-1; issue present on upstream master as of 2026-08-21)."
        }
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      "metrics": [
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          "time": "2026-08-21T00:00:00.000Z",
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    "assignerShortName": "fedora",
    "cveId": "CVE-2026-77652",
    "datePublished": "2026-08-26T19:21:39.936Z",
    "dateReserved": "2026-08-21T04:00:13.905Z",
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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.

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.