{"id":"CVE-2026-88053","title":"Tesseract is an open source OCR engine","summary":"Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadIntTemplates in src/classify/intproto.cpp reads NumClassPruners, NumClasses, and NumProtoSets from the TESSDATA_INTTEMP component of a crafted .trainedda…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cwe":["CWE-787"],"vendor":"tesseract-ocr","product":"tesseract_ocr","affected":["tesseract_ocr <= 5.5.3"],"published":"2026-09-10","updated":"2026-09-16","sourceUpdated":"2026-09-16T16:14:31.130","source":"NVD","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-88053","references":[{"url":"https://github.com/tesseract-ocr/tesseract/commit/8b0574680f3b22f246ade6a4c8e3029104255c63","label":"security-advisories@github.com"},{"url":"https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-rphx-x795-5qjv","label":"security-advisories@github.com"},{"url":"https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-rphx-x795-5qjv","label":"134c704f-9b21-4f2e-91b3-4a467353bcc0"},{"url":"https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88053.json"},{"url":"https://access.redhat.com/security/cve/CVE-2026-88053"},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2531573"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-88053"},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-88053"}],"tags":["nvd","cve.org","exploit-available","csaf","vex","red-hat"],"epss":0.00119,"epssPercentile":0.02037,"exploitAvailable":true,"ssvc":{"exploitation":"poc","automatable":"no","technicalImpact":"total","timestamp":"2026-09-11T15:57:52.566515Z"},"scores":{"nvd":7.8,"cna":8.6,"vendor":8.4},"ingestedAt":"2026-09-14T15:24:03.244Z","slug":"CVE-2026-88053","body":"## Overview\n\nTesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadIntTemplates in src/classify/intproto.cpp reads NumClassPruners, NumClasses, and NumProtoSets from the TESSDATA_INTTEMP component of a crafted .traineddata file and uses those values as loop bounds without validating them against MAX_NUM_CLASS_PRUNERS, MAX_NUM_CLASSES, and MAX_NUM_PROTO_SETS. The loops store heap pointers into fixed-capacity ClassPruners and ProtoSets arrays in INT_TEMPLATES_STRUCT and INT_CLASS_STRUCT, so an oversized count causes heap out-of-bounds pointer writes during legacy-classifier initialization before OCR begins, resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.\n\n## Affected\n\n- `tesseract_ocr <= 5.5.3`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.\n\n## Vendor advisories\n\n- **Red Hat VEX** · Important · affected: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · no fix planned: Red Hat Enterprise Linux 10, Red Hat Enterprise Linux 8, Red Hat Enterprise Linux 9 · updated 2026-09-16 · [vex](https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-88053.json)","depth":"midnight","depthScore":55,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":12,"ransomware":0},"changes":[{"seq":205550,"id":"CVE-2026-88053","ts":1789578031954,"field":"cvss","old":"8.6","new":"7.8"}]}