What’s Vulnerable › Vulnerabilities

CVE-2026-73066: Tesseract: Heap out-of-bounds write in LSTM Convolve layer via crafted .traineddata

• Severity: medium (CVSS 6.8 v4.0)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-08-11 · updated 2026-10-24
• Weakness: CWE-787

Description

Tesseract is an open source OCR engine. Prior to 5.5.3, a crafted .traineddata LSTM model component loaded through Tesseract's deserializer can cause an unchecked signed integer multiplication in Convolve::DeSerialize in src/lstm/convolve.cpp to wrap the convolution output-channel count, undersizing the forward-pass output buffer while writes use the unwrapped element count and causing a heap out-of-bounds write during OCR recognition. This issue is fixed in version 5.5.3.

Affected products

• tesseract-ocr tesseract: before 5.5.3

References

• https://github.com/tesseract-ocr/tesseract/commit/2f4d2f4bf45c363785d7bf1da29b6628f8939a72
• https://github.com/tesseract-ocr/tesseract/pull/4588
• https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.3
• https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8

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