{"id":"CVE-2026-96644","state":"PUBLISHED","title":"Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)","description":"Pillow is a Python imaging library. Prior to 13.0.0 on Windows, src/PIL/WmfImagePlugin.py passes unchecked 32-bit WMF or EMF dimensions to the native drawwmf handler in src/display.c. The handler sizes a DIB allocation from 16-bit-truncated bcWidth and bcHeight fields but copies pixel data using the original full dimensions. A crafted wide, short metafile can pass the pixel-count decompression-bomb check and make the Windows-only renderer read beyond the heap buffer, potentially disclosing memory or crashing the process. This issue is fixed in version 13.0.0.","publishedAt":"2026-10-21T20:54:43.537Z","updatedAt":"2026-10-28T18:22:38.027Z","severity":{"score":7.1,"label":"High","version":"4.0","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","source":"GitHub_M"},"assigner":"GitHub_M","products":["python-pillow Pillow"],"affected":[{"vendor":"python-pillow","product":"Pillow","versions":[{"version":"< 13.0.0","status":"affected"}]}],"references":["https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj","https://github.com/python-pillow/Pillow/pull/10120","https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7","https://github.com/python-pillow/Pillow/releases/tag/13.0.0"],"weaknesses":["CWE-125"],"ingestedAt":"2026-10-29T20:13:43.249Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/96xxx/CVE-2026-96644.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-96644","state":"PUBLISHED","datePublished":"2026-10-21T20:54:43.537Z","dateUpdated":"2026-10-28T18:22:38.027Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-09-23T14:35:50.130Z"},"containers":{"cna":{"title":"Pillow: Heap over-read in WMF/EMF rendering via 16-bit dimension truncation (Windows builds)","descriptions":[{"lang":"en","value":"Pillow is a Python imaging library. Prior to 13.0.0 on Windows, src/PIL/WmfImagePlugin.py passes unchecked 32-bit WMF or EMF dimensions to the native drawwmf handler in src/display.c. The handler sizes a DIB allocation from 16-bit-truncated bcWidth and bcHeight fields but copies pixel data using the original full dimensions. A crafted wide, short metafile can pass the pixel-count decompression-bomb check and make the Windows-only renderer read beyond the heap buffer, potentially disclosing memory or crashing the process. This issue is fixed in version 13.0.0."}],"affected":[{"vendor":"python-pillow","product":"Pillow","versions":[{"version":"< 13.0.0","status":"affected"}]}],"references":[{"url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj","name":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/python-pillow/Pillow/pull/10120","name":"https://github.com/python-pillow/Pillow/pull/10120","tags":["x_refsource_MISC"]},{"url":"https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7","name":"https://github.com/python-pillow/Pillow/commit/4cf46bee338304c5c8968fd7f132ba0d40c428b7","tags":["x_refsource_MISC"]},{"url":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0","name":"https://github.com/python-pillow/Pillow/releases/tag/13.0.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV4_0":{"attackVector":"NETWORK","attackComplexity":"LOW","attackRequirements":"NONE","privilegesRequired":"NONE","userInteraction":"PASSIVE","vulnConfidentialityImpact":"LOW","vulnIntegrityImpact":"NONE","vulnAvailabilityImpact":"HIGH","subConfidentialityImpact":"NONE","subIntegrityImpact":"NONE","subAvailabilityImpact":"NONE","baseScore":7.1,"baseSeverity":"HIGH","vectorString":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-125","lang":"en","description":"CWE-125: Out-of-bounds Read","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-10-21T20:54:43.537Z"},"source":{"advisory":"GHSA-9v9v-9qvf-h2hj","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","references":[{"url":"https://github.com/python-pillow/Pillow/security/advisories/GHSA-9v9v-9qvf-h2hj","tags":["exploit"]}],"metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-10-28T18:22:22.322892Z","id":"CVE-2026-96644","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-28T18:22:38.027Z"}}]}}}