Heap Corruption Vulnerability in Tesseract OCR Engine
CVE-2026-88049

8.6HIGH

Key Information:

Vendor

Tesseract-ocr

Status
Tesseract
Vendor
CVE Published:
10 September 2026

What is CVE-2026-88049?

The Tesseract OCR Engine, an open source optical character recognition (OCR) tool, is susceptible to a heap corruption vulnerability in versions up to 5.5.3. The issue arises due to insufficient bounds checks in the NetworkIO methods during the handling of LSTM layers. Specifically, if a malicious actor crafts an NT_LSTM layer, it can manipulate the output to exceed expected dimensional limits, leading to heap out-of-bounds writes. This can result in heap corruption and crashes or potentially allow for controlled corruption during processing. No fix is currently available, making it critical for users of affected versions to exercise caution.

Affected Version(s)

tesseract <= 5.5.3

References

https://github.com/tesseract-ocr/tesseract/security/advis...
x_refsource_CONFIRM
https://github.com/tesseract-ocr/tesseract/commit/b494ac1...
x_refsource_MISC

CVSS V4

Score:
8.6
Severity:
HIGH
Confidentiality:
High
Integrity:
High
Availability:
High
Attack Vector:
Local
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

.