Buffer overflow in Tesseract-Ocr Tesseract
CVE-2026-88053
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 .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.
Vulnerability class: Buffer Overflow
Published · last modified .
CVSS v3 metric
CVSS v3 base score 7.8 (High). Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H.
EPSS exploit prediction
EPSS: 0.002 (7.0th percentile), scored .
Very low probability of exploitation in the next 30 days; routine patching cadence is appropriate. 7th percentile — 7.0% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.
EPSS over last 30 days · oldest: 0.002 · newest: 0.002 · change: 0.000
Affected products
- Tesseract-Ocr Tesseract — versions <= 5.5.3
- Tesseract-Ocr Tesseract Ocr
Weakness classification (CWE)
References
- github.com/tesseract-ocr/tesseract/security/advisories/GHSA-rphx-x795-5qjv (Exploit, Mitigation, Vendor Advisory)
- github.com/tesseract-ocr/tesseract/commit/8b0574680f3b22f246ade6a4c8e3029104255… (Patch)
Frequently asked questions
- What is CVE-2026-88053?
- CVE-2026-88053 is a high-severity vulnerability in Tesseract-Ocr Tesseract, classified under Out-of-bounds Write. CVSS score: 7.8/10. Published 2026-09-10.
- How severe is CVE-2026-88053?
- High severity. CVSS v3 base score is 7.8 out of 10.