CVE-2026-88048: Tesseract-Ocr Tesseract Ocr

High severity, CVSS 7.1. 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, FullyConnected::DeSerialize in src/lstm/fullyconnected.cpp does not validate the deserialized layer scalars ni_ and no_ against the weight-matrix dimensions. During FullyConnected::Forward, MatrixDotVector in src/lstm/weightmatrix.cpp writes w.dim1() results into temp_line, which is sized from no_, and reads w.dim2() minus one inputs from curr_input, which is sized from ni_. A crafted .traineddata NT_SOFTMAX layer can therefore use inconsistent dimensions to cause a heap out-of-bounds write and read on the default LSTM engine, resulting in heap corruption, a crash, information disclosure, or potentially controlled corruption. 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 2026-09-14.