# CVE-2026-88052

## Summary

- **CVE ID:** CVE-2026-88052
- **Severity:** HIGH
- **CVSS Score:** 7.8 (CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H)
- **CWE:** CWE-129, 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, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked index into the unichars vector. unichar_insert_backwards_compatible can leave the vector unchanged for an empty, duplicate, or already-encodable representation, causing id to become larger than unichars.size(). Subsequent set_* calls and the write to unichars[id].properties.enabled then write UNICHAR_PROPERTIES beyond the vector during initialization in both the default LSTM and legacy engines, causing 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-2hm8-q5c7-c373)
- [CNA](https://github.com/tesseract-ocr/tesseract/commit/2d04d640db2e8c7e3bab2369d599343b5a8b8443)

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