# CVE-2026-88049

## Summary

- **CVE ID:** CVE-2026-88049
- **Severity:** HIGH
- **CVSS Score:** 8.6 (CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N)
- **CWE:** CWE-787
- **Published:** Sep 10, 2026
- **Last Modified:** Sep 10, 2026

## Description

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In LSTM::Forward in src/lstm/lstm.cpp, source_ is sized from the independently deserialized na_ field while the WriteTimeStepPart count is ns_, which comes from the CI gate WeightMatrix dim1() value. A crafted NT_LSTM layer can make ns_ much larger than na_, causing a heap out-of-bounds write during the first recognition step on the default LSTM engine and resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.

## Affected Products

- tesseract-ocr — tesseract (<= 5.5.3)

## References

- [CNA](https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-jgq8-pprg-vc68)
- [CNA](https://github.com/tesseract-ocr/tesseract/commit/b494ac18925f9d9aff9ef5815475de9943ab19bf)

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_Exported from OnDuty AI Vulnerability Intelligence on 2026-09-11._