{
    "dataType": "CVE_RECORD",
    "dataVersion": "5.2",
    "cveMetadata": {
        "cveId": "CVE-2026-77652",
        "assignerOrgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5",
        "state": "PUBLISHED",
        "assignerShortName": "fedora",
        "dateReserved": "2026-08-21T04:00:13.905Z",
        "datePublished": "2026-08-26T19:21:39.936Z",
        "dateUpdated": "2026-08-26T19:21:39.936Z"
    },
    "containers": {
        "cna": {
            "title": "Dia: dia: heap buffer overflow in wpg colormap parser via out-of-bounds palette index",
            "metrics": [
                {
                    "other": {
                        "content": {
                            "value": "Important",
                            "namespace": "https://access.redhat.com/security/updates/classification/"
                        },
                        "type": "Red Hat severity rating"
                    }
                },
                {
                    "cvssV3_1": {
                        "attackComplexity": "LOW",
                        "attackVector": "LOCAL",
                        "availabilityImpact": "HIGH",
                        "baseScore": 7.8,
                        "baseSeverity": "HIGH",
                        "confidentialityImpact": "HIGH",
                        "integrityImpact": "HIGH",
                        "privilegesRequired": "NONE",
                        "scope": "UNCHANGED",
                        "userInteraction": "REQUIRED",
                        "vectorString": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H",
                        "version": "3.1"
                    },
                    "format": "CVSS"
                }
            ],
            "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->pPal = 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 &= (iNum16 == (int)fread(&ren->pPal[i16], sizeof(WPGColorRGB), iNum16, f));\n\nThe 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.\n\nA 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.\n\nExploitation 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.\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)."
                }
            ],
            "affected": [
                {
                    "vendor": "GNOME",
                    "product": "Dia",
                    "versions": [
                        {
                            "status": "affected",
                            "version": "0",
                            "versionType": "semver",
                            "lessThanOrEqual": "0.98+git20260221-1"
                        }
                    ],
                    "packageName": "dia",
                    "collectionURL": "https://gitlab.gnome.org/GNOME/dia/-/issues/580",
                    "defaultStatus": "unaffected"
                }
            ],
            "references": [
                {
                    "url": "https://access.redhat.com/security/cve/CVE-2026-77652",
                    "tags": [
                        "vdb-entry",
                        "x_refsource_REDHAT"
                    ]
                },
                {
                    "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520884",
                    "name": "RHBZ#2520884",
                    "tags": [
                        "issue-tracking",
                        "x_refsource_REDHAT"
                    ]
                },
                {
                    "url": "https://gitlab.gnome.org/GNOME/dia/-/blob/master/plug-ins/wpg/wpg-import.c"
                },
                {
                    "url": "https://gitlab.gnome.org/GNOME/dia/-/issues/580"
                }
            ],
            "datePublic": "2026-08-21T00:00:00.000Z",
            "problemTypes": [
                {
                    "descriptions": [
                        {
                            "cweId": "CWE-122",
                            "description": "Heap-based Buffer Overflow",
                            "lang": "en",
                            "type": "CWE"
                        }
                    ]
                }
            ],
            "x_redhatCweChain": "CWE-122: Heap-based Buffer Overflow",
            "timeline": [
                {
                    "lang": "en",
                    "time": "2026-08-21T03:45:55.032Z",
                    "value": "Reported to Red Hat."
                },
                {
                    "lang": "en",
                    "time": "2026-08-21T00:00:00.000Z",
                    "value": "Made public."
                }
            ],
            "credits": [
                {
                    "lang": "en",
                    "value": "Red Hat would like to thank Robin \"drzobin\" Larsson for reporting this issue."
                }
            ],
            "providerMetadata": {
                "orgId": "92fb86c3-55a5-4fb5-9c3f-4757b9e96dc5",
                "shortName": "fedora",
                "dateUpdated": "2026-08-26T19:21:39.936Z"
            },
            "x_generator": {
                "engine": "cvelib 1.8.0"
            }
        }
    }
}