{"apiVersion":"1.0","identifier":"CVE-2026-77652","description":"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).","publishedAt":"2026-08-26T20:18:02","lastModifiedAt":"2026-08-28T15:44:39","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-77652","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H","epssProbability":0.00151,"riskScore":0.79,"affectedProduct":"Dia","affectedVersions":"unknown","vulnerabilityType":"Other","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-77652","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-77652","en":"https://www.redsauce.net/en/cves/CVE-2026-77652","fr":"https://www.redsauce.net/fr/cves/CVE-2026-77652","pt":"https://www.redsauce.net/pt/cves/CVE-2026-77652","de":"https://www.redsauce.net/de/cves/CVE-2026-77652","sk":"https://www.redsauce.net/sk/cves/CVE-2026-77652","el":"https://www.redsauce.net/el/cves/CVE-2026-77652"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-77652"}}