{"schema":"threatline.record/2","record":{"id":"CVE-2026-26054","aliases":["GHSA-27p6-wrfp-pgm8"],"summary":"SumatraPDF: Heap out-of-bounds read in MOBI header parser.","details":"SumatraPDF is a multi-format reader for Windows. Prior to 3.6, the MobiDoc::ParseHeader function in src/MobiDoc.cpp validates a record using kMobiHeaderMinLen but DecodeMobiDocHeader constructs a decoder sized for kMobiHeaderLen without receiving the actual remaining buffer length. A malformed MOBI file can use an attacker-controlled header length to bypass optional-field early returns and cause the decoder to read beyond a short heap buffer. Opening the crafted document can crash SumatraPDF. This issue is fixed in version 3.6.","categories":["Unclassified"],"product":"sumatrapdf","vendor":"sumatrapdfreader","ecosystem":null,"affected_ranges":[{"source":"CVE List","source_url":"https://www.cve.org/CVERecord?id=CVE-2026-26054","source_modified_at":"2026-09-28T15:33:32.202Z","fetched_at":"2026-10-23T18:52:38.922436Z","product":"sumatrapdf","vendor":"sumatrapdfreader","versions":[{"status":"affected","version":"< 3.6"}],"defaultStatus":null},{"source":"GitHub Advisory Database","source_url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-27p6-wrfp-pgm8","source_modified_at":"2026-09-16T15:55:28Z","fetched_at":"2026-10-24T18:03:20.872036Z","package":{"name":"sumatrapdf","ecosystem":null},"range":"<=3.5.2"}],"fixed_versions":[],"cvss":6.8,"severity":"Medium","kev":{"listed":false},"epss":{"probability":0.00135,"percentile":0.02676,"score_date":"2026-10-23"},"published_at":"2026-09-24T16:48:03.247Z","modified_at":"2026-09-28T15:33:32.202Z","provenance":[{"source":"CVE List","url":"https://www.cve.org/CVERecord?id=CVE-2026-26054","fetched_at":"2026-10-23T18:52:38.922436Z","source_modified_at":"2026-09-28T15:33:32.202Z"},{"source":"GitHub Advisory Database","url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-27p6-wrfp-pgm8","fetched_at":"2026-10-24T18:03:20.872036Z","source_modified_at":"2026-09-16T15:55:28Z"},{"source":"EPSS","url":"https://api.first.org/data/v1/epss?cve=CVE-2026-26054","fetched_at":"2026-10-23T18:42:43.628194Z","source_modified_at":"2026-10-23"}],"sources":["CVE List","GitHub Advisory Database","EPSS"],"references":[{"source":"CVE List","url":"https://github.com/sumatrapdfreader/sumatrapdf/security/advisories/GHSA-27p6-wrfp-pgm8","tags":["exploit"]},{"source":"CVE List","url":"https://github.com/sumatrapdfreader/sumatrapdf/issues/5318","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/sumatrapdfreader/sumatrapdf/commit/24b9ce83383bbaa48b3efe00e4d30cccea126198","tags":["x_refsource_MISC"]},{"source":"CVE List","url":"https://github.com/sumatrapdfreader/sumatrapdf/releases/tag/3.6rel","tags":["x_refsource_MISC"]}],"locations":[],"motoko_assessment":{"status":"requires_architecture_review","automatic_remediation":false},"cve_state":"PUBLISHED","cvss_source":"CVE List","ssvc":{"exploitation":"poc","automatable":"no","technical_impact":"partial","assessed_at":"2026-09-28T15:33:10.549166Z"},"classification":{"method":"product-first software-layer rules","rules_version":"2.1","matched_on":null,"confidence":"unknown","reviewed":false},"change_timestamp":"2026-09-28T15:33:32.202Z","content_hash":"b01d72f2822418c46311b817f1dd5dd991c3ff3c3193c9c2c1cfe859ab710268"}}