{"id":"CVE-2026-88052","summary":"Tesseract: Heap out-of-bounds write in UNICHARSET::load_via_fgets via count/insert desynchronization","details":"Tesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked index into the unichars vector. unichar_insert_backwards_compatible can leave the vector unchanged for an empty, duplicate, or already-encodable representation, causing id to become larger than unichars.size(). Subsequent set_* calls and the write to unichars[id].properties.enabled then write UNICHAR_PROPERTIES beyond the vector during initialization in both the default LSTM and legacy engines, causing heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.","aliases":["GHSA-2hm8-q5c7-c373"],"modified":"2026-09-13T03:47:18.982437330Z","published":"2026-09-10T17:38:04.675Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88052.json","cna_assigner":"GitHub_M","cwe_ids":["CWE-129","CWE-787"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/88xxx/CVE-2026-88052.json"},{"type":"ADVISORY","url":"https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-2hm8-q5c7-c373"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88052"},{"type":"FIX","url":"https://github.com/tesseract-ocr/tesseract/commit/2d04d640db2e8c7e3bab2369d599343b5a8b8443"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/tesseract-ocr/tesseract","events":[{"introduced":"0"},{"fixed":"2d04d640db2e8c7e3bab2369d599343b5a8b8443"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"last_affected":"5.5.3"}]}}],"versions":["5.5.3","5.5.2","5.5.1","5.5.0","5.4.1","5.4.0","5.4.0-rc2","5.4.0-rc1","5.3.4","5.3.3","5.3.2","5.3.1","5.3.0","5.3.0-rc1","5.2.0","5.1.0","5.0.1","5.0.0","5.0.0-rc3","5.0.0-rc2","5.0.0-rc1","5.0.0-beta-20210916","5.0.0-alpha-20210401","5.0.0-alpha-20201231","5.0.0-alpha-20201224","5.0.0-alpha","4.1.0-rc1","4.0.0","4.0.0-rc4","4.0.0-rc3","4.0.0-beta.4","4.0.0-beta.3","4.0.0-beta.1","4.00.00dev","4.00.00alpha","4.0.0-alpha","3.03-rc1","3.05.00dev","3.04.00","3.02.02","3.01","3.00","2.04","2.03","2.02","2.01","2.00","1.04b","1.04","1.03"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-88052.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H"}]}