{"schema":"threatline.record/2","record":{"id":"CVE-2026-107738","aliases":["GHSA-33jg-vxm6-8mxx"],"summary":"SumatraPDF: Untrusted binary record offset used without lower-bound validation","details":"SumatraPDF is a multi-format reader for Windows. In 3.6.1 and earlier, ChmFile::GetCharZ() narrows file-controlled unsigned string offsets from /#WINDOWS and /#IVB to signed integers without a lower-bound check. An offset that becomes negative can make the function read before the /#STRINGS buffer, causing deterministic application termination. No broader impact is claimed beyond the advisory-supported conditions. No fixed version is available as of this review.","categories":["Unclassified"],"product":"sumatrapdf","vendor":"sumatrapdfreader","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-107738","source_modified_at":"2026-10-14T01:36:13.121Z","fetched_at":"2026-10-23T18:48:36.087640Z","product":"sumatrapdf","vendor":"sumatrapdfreader","versions":[{"version":"<= 3.6.1","status":"affected"}],"defaultStatus":null}],"fixed_versions":[],"cvss":6.8,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.0012,"percentile":0.01704,"score_date":"2026-10-23"},"published_at":"2026-10-08T22:35:30.475Z","modified_at":"2026-10-14T01:36:13.121Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-107738","fetched_at":"2026-10-23T18:48:36.087640Z","source_modified_at":"2026-10-14T01:36:13.121Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-107738","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-33jg-vxm6-8mxx","tags":["x_refsource_CONFIRM"]},{"source":"CVE List","url":"https://github.com/sumatrapdfreader/sumatrapdf/commit/62254ed6d781ceb5cd16489bb423e7f591cd72c4","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"none","automatable":"no","technical_impact":"partial","assessed_at":"2026-10-14T01:35:46.846461Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-10-14T01:36:13.121Z","content_hash":"e12c47a0d3378f6c2d07248f3a1b2c95b68084bc79c4b5f31b874e149fe45f27"}}