CVE-2026-88054: Tesseract-Ocr Tesseract Ocr

Medium severity, CVSS 5.5. EPSS: 0.2% chance of exploitation in the next 30 days.

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Plumbing::DeSerialize in src/lstm/plumbing.cpp rejects excessively large network stacks but accepts a zero-length stack for NT_SERIES, NT_PARALLEL, or NT_REVERSED layers in a crafted .traineddata model. During LSTMRecognizer initialization in src/lstm/lstmrecognizer.cpp, CacheXScaleFactor(XScaleFactor()) reaches Series::CacheXScaleFactor in src/lstm/series.cpp, which dereferences stack_[0] on the empty vector and invokes a virtual method through an invalid Network pointer. This causes a deterministic crash and denial of service at model load. No fixed release is available as of this review.

Affected products

• Tesseract-Ocr Tesseract Ocr: up to and including 5.5.3

Published 2026-09-10. Last modified 2026-09-16.