{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-63660", "assignerOrgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "state": "PUBLISHED", "assignerShortName": "GitHub_M", "dateReserved": "2026-07-17T14:47:08.031Z", "datePublished": "2026-11-11T02:40:47.419Z", "dateUpdated": "2026-11-11T02:40:47.419Z"}, "containers": {"cna": {"title": "node-fontnik: integer-overflow heap out-of-bounds write in RenderSDF", "problemTypes": [{"descriptions": [{"cweId": "CWE-190", "lang": "en", "description": "CWE-190: Integer Overflow or Wraparound", "type": "CWE"}]}, {"descriptions": [{"cweId": "CWE-787", "lang": "en", "description": "CWE-787: Out-of-bounds Write", "type": "CWE"}]}], "metrics": [{"cvssV3_1": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}}], "references": [{"name": "https://github.com/mapbox/node-fontnik/security/advisories/GHSA-cfm6-c7rv-58xj", "tags": ["x_refsource_CONFIRM"], "url": "https://github.com/mapbox/node-fontnik/security/advisories/GHSA-cfm6-c7rv-58xj"}, {"name": "https://github.com/mapbox/node-fontnik/pull/202", "tags": ["x_refsource_MISC"], "url": "https://github.com/mapbox/node-fontnik/pull/202"}, {"name": "https://github.com/mapbox/node-fontnik/releases/tag/v0.7.7", "tags": ["x_refsource_MISC"], "url": "https://github.com/mapbox/node-fontnik/releases/tag/v0.7.7"}], "affected": [{"vendor": "mapbox", "product": "node-fontnik", "versions": [{"version": "< 0.7.7", "status": "affected"}]}], "providerMetadata": {"orgId": "a0819718-46f1-4df5-94e2-005712e83aaa", "shortName": "GitHub_M", "dateUpdated": "2026-11-11T02:40:47.419Z"}, "descriptions": [{"lang": "en", "value": "node-fontnik is a library that delivers a range of glyphs rendered as SDFs (signed distance fields) in a protocol buffer. Prior to version 0.7.7, a crafted font could trigger a heap out-of-bounds write in RenderSDF (include/mapbox/glyph_foundry_impl.hpp). RenderSDF computed the SDF bitmap allocation size as buffered_width * buffered_height in 32-bit unsigned int. Glyph dimensions are derived from the uploaded font's outline bounding box with no upper bound, so a glyph large enough to make that product exceed 2\u00b3\u00b2 wrapped to a small value. The buffer was then under-allocated while the render loop still wrote one byte per pixel, corrupting the heap (CWE-190 \u2192 CWE-787) and crashing the process. A 680-byte font is enough to drive FreeType to a 65536\u00d765536 buffered glyph, wrapping the size to 0. This issue has been patched in version 0.7.7."}], "source": {"advisory": "GHSA-cfm6-c7rv-58xj", "discovery": "UNKNOWN"}}}}

{}

{"affected": [{"affectedData": [{"product": "node-fontnik", "vendor": "mapbox", "versions": [{"status": "affected", "version": "< 0.7.7"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "node-fontnik is a library that delivers a range of glyphs rendered as SDFs (signed distance fields) in a protocol buffer. Prior to version 0.7.7, a crafted font could trigger a heap out-of-bounds write in RenderSDF (include/mapbox/glyph_foundry_impl.hpp). RenderSDF computed the SDF bitmap allocation size as buffered_width * buffered_height in 32-bit unsigned int. Glyph dimensions are derived from the uploaded font's outline bounding box with no upper bound, so a glyph large enough to make that product exceed 2\u00b3\u00b2 wrapped to a small value. The buffer was then under-allocated while the render loop still wrote one byte per pixel, corrupting the heap (CWE-190 \u2192 CWE-787) and crashing the process. A 680-byte font is enough to drive FreeType to a 65536\u00d765536 buffered glyph, wrapping the size to 0. This issue has been patched in version 0.7.7."}], "id": "CVE-2026-63660", "lastModified": "2026-11-11T03:16:52.367", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 8.1, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 2.8, "impactScore": 5.2, "source": "security-advisories@github.com", "type": "Secondary"}]}, "published": "2026-11-11T03:16:52.367", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/mapbox/node-fontnik/pull/202"}, {"source": "security-advisories@github.com", "url": "https://github.com/mapbox/node-fontnik/releases/tag/v0.7.7"}, {"source": "security-advisories@github.com", "url": "https://github.com/mapbox/node-fontnik/security/advisories/GHSA-cfm6-c7rv-58xj"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Received", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-190"}, {"lang": "en", "value": "CWE-787"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{}

{}