CVE-2026-77652

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{"affected": [{"affectedData": [{"collectionURL": "https://gitlab.gnome.org/GNOME/dia/-/issues/580", "defaultStatus": "unaffected", "packageName": "dia", "product": "Dia", "vendor": "GNOME", "versions": [{"lessThanOrEqual": "0.98+git20260221-1", "status": "affected", "version": "0", "versionType": "semver"}]}], "source": "patrick@puiterwijk.org"}], "cveTags": [], "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\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 &pPal[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'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)."}], "id": "CVE-2026-77652", "lastModified": "2026-08-28T15:44:39.323", "metrics": {"cvssMetricV31": [{"cvssData": {"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"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "patrick@puiterwijk.org", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-77652", "options": [{"exploitation": "poc"}, {"automatable": "no"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-08-27T14:42:56.357247Z", "version": "2.0.3"}}]}, "published": "2026-08-26T20:18:02.160", "references": [{"source": "patrick@puiterwijk.org", "url": "https://access.redhat.com/security/cve/CVE-2026-77652"}, {"source": "patrick@puiterwijk.org", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520884"}, {"source": "patrick@puiterwijk.org", "url": "https://gitlab.gnome.org/GNOME/dia/-/blob/master/plug-ins/wpg/wpg-import.c"}, {"source": "patrick@puiterwijk.org", "url": "https://gitlab.gnome.org/GNOME/dia/-/issues/580"}, {"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "url": "https://gitlab.gnome.org/GNOME/dia/-/issues/580"}], "sourceIdentifier": "patrick@puiterwijk.org", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-122"}], "source": "patrick@puiterwijk.org", "type": "Secondary"}]}

{"acknowledgement": "Red Hat would like to thank Robin \"drzobin\" Larsson for reporting this issue.", "bugzilla": {"description": "dia: dia: heap buffer overflow in WPG colormap parser via out-of-bounds palette index", "id": "2520884", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2520884"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.8", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-122", "details": ["A heap-based buffer overflow vulnerability exists in the Dia diagram editor WPG file format importer.\nIn plug-ins/wpg/wpg-import.c, the WPG import renderer allocates a fixed palette with:\nren->pPal = g_new0(WPGColorRGB, 256);\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:\nbRet &= (iNum16 == (int)fread(&ren->pPal[i16], sizeof(WPGColorRGB), iNum16, f));\nThe only bounds-related check is `if (i16 >= 0 && i16 <= 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.\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 \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.\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.\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)."], "mitigation": {"lang": "en:us", "value": "Do not open untrusted WPG files with Dia until a fixed version is installed. There is no configuration-based workaround."}, "name": "CVE-2026-77652", "public_date": "2026-08-21T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-77652\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-77652\nhttps://gitlab.gnome.org/GNOME/dia/-/blob/master/plug-ins/wpg/wpg-import.c\nhttps://gitlab.gnome.org/GNOME/dia/-/issues/580"], "statement": "A heap-based buffer overflow flaw was found in Dia's WPG import plugin. The parser does not properly validate colormap indices read from a WPG file against the fixed-size internal palette buffer. An attacker could use this flaw to crash Dia or, potentially, execute arbitrary code if a victim opens a specially crafted WPG file.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0.98+git20260221-1,*]"}}], "enrichment": {"confidence": 80.0, "confidence_source": "inferred", "scores": [{"score": 80.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "product": "dia", "vendor": "gnome"}], "created": "2026-08-25T13:30:17.401228+00:00", "updated": "2026-08-26T20:45:03.796535+00:00", "vendors": ["gnome", "gnome$PRODUCT$dia"]}