{"id":"CVE-2026-107737","revision":null,"records":[{"revision":"7e23a90357b843a7bc6aced91fc2efda","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-107737","aliases":[],"title":"SumatraPDF CHM `its://` signed index causes an out-of-bounds object lookup","description":"SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, and in pre-release 3.7.0.20369 when WebView2 is absent or cannot initialize, ParseProtoUrl() accepts the signed host component of an its:// URL and FindHtmlWindowById() uses it directly as an index into gHtmlWindows. Opening a crafted CHM through the IE fallback backend with a negative or otherwise out-of-range window identifier can cause an out-of-bounds pointer read followed by an invalid object callback dereference and process termination. No fixed version is available as of this review.","state":0,"publishedAt":"2026-10-08T22:34:16.436+00:00","modifiedAt":"2026-10-13T16:28:11.204+00:00","affected":[{"ecosystem":"Vendor product","name":"sumatrapdf","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"sumatrapdfreader\",\n                    \"product\": \"sumatrapdf\",\n                    \"versions\": [\n                        {\n                            \"version\": \"<= 3.6.1\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 4.0","vector":"CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","score":5.7,"severity":"MEDIUM"}],"references":["https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-8p34-f32f-7rmq","https://github.com/sumatrapdfreader/sumatrapdf/commit/596c7e26e983549a77a3a38cae1147ab73792929"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-107737","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-107737","identifiers":["CVE-2026-107737"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all vendors. Missing entries do not establish absence of exploitation.","generation":"2026-11-10T07:03:58.7434242+00:00","complete":true,"records":1773,"lastAttemptAt":"2026-11-10T07:03:58.7434242+00:00","lastSuccessAt":"2026-11-10T07:03:59.0484779+00:00","error":null,"lastVerifiedAt":"2026-11-10T07:03:59.048478+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"cve-program","scope":"Official CVE Program baseline and cumulative hourly delta; all vendors, published and rejected records","generation":"cve-8859cf40d4337e24bd2f258cc7778fbad01bb24c79d057aaf34cf1dfc6f8917d-91b398b0ac92bbc624d45e98f488e711d54c8f459586081e22df0a998ae56dce","complete":true,"records":421905,"lastAttemptAt":"2026-11-10T07:02:14.6737831+00:00","lastSuccessAt":"2026-11-10T07:02:14.6206389+00:00","error":null,"lastVerifiedAt":"2026-11-10T07:02:14.6737831+00:00","snapshotPublishedAt":"2026-11-10T06:31:46+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"euvd","scope":"Rolling EUVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global EUVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-2e6a476534094233b48f2f0b6da5cf35","complete":true,"records":13689,"lastAttemptAt":"2026-11-10T07:04:24.75366+00:00","lastSuccessAt":"2026-11-10T06:05:35.03+00:00","error":null,"lastVerifiedAt":"2026-11-10T06:05:35.03+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13742,"expectedIdentifiers":13742,"failedIdentifiers":0},{"source":"first-epss:nuget","scope":"FIRST EPSS for explicit CVE aliases in the collected public NuGet archive. Not a global EPSS backfill.","generation":"2026-11-10T07:03:58.7434242+00:00","complete":true,"records":1096,"lastAttemptAt":"2026-11-10T07:03:58.7434242+00:00","lastSuccessAt":"2026-11-10T07:03:59.049149+00:00","error":null,"lastVerifiedAt":"2026-11-10T07:03:59.049149+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"nvd","scope":"Rolling NVD lookups of CVE aliases in current public OSV archives; 500 identifiers per refresh, rechecked after 48 hours. Not a global NVD catalog. Successful not-found lookups count as checked; they do not imply withdrawal or safety. No reader inventory is sent.","generation":"enrichment-d71a61bd41e147f4a9126c2a3d45b565","complete":false,"records":13695,"lastAttemptAt":"2026-11-10T07:04:24.141829+00:00","lastSuccessAt":"2026-11-10T07:04:24.138+00:00","error":"100 identifier lookups failed; latest failures include request timeout. Other identifiers were checked independently.","lastVerifiedAt":"2026-11-10T07:04:24.138+00:00","snapshotPublishedAt":null,"importing":false,"stagedRecords":0,"checkedIdentifiers":13642,"expectedIdentifiers":13742,"failedIdentifiers":100},{"source":"osv:Go","scope":"Complete OSV Go ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"go-cdffb4589856378aa42e8d1bd4a6c74e27a180d8160bf764c44715ef760f0a62","complete":true,"records":9932,"lastAttemptAt":"2026-11-10T07:03:58.6990249+00:00","lastSuccessAt":"2026-11-10T00:04:19.8260565+00:00","error":null,"lastVerifiedAt":"2026-11-10T07:03:58.6990249+00:00","snapshotPublishedAt":"2026-11-09T23:48:01+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:NuGet","scope":"Complete OSV NuGet ecosystem archive, including GitHub Advisory Database records; NuGet version matching only","generation":"nuget-26503967ae4379db8f374089589d6e03fb15bd31f820c9e992aaf93840c2236c","complete":true,"records":1971,"lastAttemptAt":"2026-11-10T07:02:14.8606265+00:00","lastSuccessAt":"2026-11-09T21:02:20.472473+00:00","error":null,"lastVerifiedAt":"2026-11-10T07:02:14.8606265+00:00","snapshotPublishedAt":"2026-11-09T20:18:18+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:crates.io","scope":"Complete OSV crates.io ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"crates.io-14f555fdbdce5e9103ab1251a692b612ea1fcd0b3d538af6015a071f4b299249","complete":true,"records":3065,"lastAttemptAt":"2026-11-10T07:03:58.7132407+00:00","lastSuccessAt":"2026-11-10T06:04:36.7449268+00:00","error":null,"lastVerifiedAt":"2026-11-10T07:03:58.7132407+00:00","snapshotPublishedAt":"2026-11-10T05:33:02+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null},{"source":"osv:npm","scope":"Complete OSV npm ecosystem archive, including withdrawn and malicious-package source records; statement counts are not unique CVE counts","generation":"npm-d4d3fe345e4cd6b7d1a871cd960b91062a9e5364cd12e8b83dd56ff53c80f866","complete":true,"records":231596,"lastAttemptAt":"2026-11-10T07:03:58.5742559+00:00","lastSuccessAt":"2026-11-10T07:03:57.1903356+00:00","error":null,"lastVerifiedAt":"2026-11-10T07:03:58.5742559+00:00","snapshotPublishedAt":"2026-11-10T06:33:16+00:00","importing":false,"stagedRecords":0,"checkedIdentifiers":null,"expectedIdentifiers":null,"failedIdentifiers":null}]}