{"schemaVersion":3,"id":"CVE-2026-107730","aliases":[],"status":"published","duplicateOf":null,"title":null,"description":"SumatraPDF is a multi-format reader for Windows. In 3.7.0.22298, LitParseHeader() in src/LitDoc.cpp computes the attacker-controlled hdrLen + nPieces * 16 section offset using signed 32-bit arithmetic without validating the complete result. When the component values make that aggregate calculation overflow to a negative value, pointer construction reaches an invalid read in LitU32(), causing deterministic application termination. The supplied evidence does not demonstrate code execution, information disclosure, arbitrary read, or integrity impact. No fixed version is available as of this review.","dates":{"published":"2026-10-08T22:19:46.900Z","modified":"2026-10-09T15:06:40.595Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":5.5,"severity":"medium","version":"3.1","versionLabel":"v3.1","source":"CVE.org","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","computed":false,"selection":"backend-summary"},"metrics":[{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":5.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":5.5,"severity":"medium","vector":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","exploitability":null,"impact":null,"computed":false}]},"epss":{"probability":0.00122,"percentile":0.01823,"severity":"low","asOf":"2026-10-21T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-09T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00122,"percentile":0.01823}],"last30":[{"date":"2026-10-09T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-20T00:00:00.000Z","score":0.00122,"percentile":null},{"date":"2026-10-21T00:00:00.000Z","score":0.00122,"percentile":0.01823}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-190","name":"Integer Overflow or Wraparound","description":"The product performs a calculation that can\n         produce an integer overflow or wraparound when the logic\n         assumes that the resulting value will always be larger than\n         the original value. This occurs when an integer value is\n         incremented to a value that is too large to store in the\n         associated representation. When this occurs, the value may\n         become a very small or negative number.","type":"weakness","status":"Stable","abstraction":"Base","likelihoodOfExploit":"Medium","url":"https://cwe.mitre.org/data/definitions/190.html"}],"affected":[{"vendor":"sumatrapdfreader","product":"sumatrapdf","name":"sumatrapdf","label":"sumatrapdf","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 3.7.0.22298","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 3.7.0.22298","eol":null,"hubHref":"/vendor/sumatrapdfreader/sumatrapdf"}],"affectedCount":1,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-vfpj-qhvj-92wg","label":"github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-vfpj-qhvj-92wg","hostname":"github.com","tags":["X Refsource CONFIRM"]},{"url":"https://github.com/sumatrapdfreader/sumatrapdf/commit/10a83278a5a6f67194dedfb67c47474d22ecfe4b","label":"github.com/sumatrapdfreader/sumatrapdf/commit/10a83278a5a6f67194dedfb67c47474d22ecfe4b","hostname":"github.com","tags":["X Refsource MISC"]}],"lineage":{"upstream":[],"downstream":[],"duplicates":[],"related":[]},"timeline":[{"kind":"published","date":"2026-10-08T22:19:46.900Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-09T15:06:40.595Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":22,"level":"low","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-22T10:02:08.693Z","stale":false,"partial":false}}