What’s Vulnerable › Vulnerabilities

CVE-2026-88050: Tesseract: Out-of-bounds write in UnicharCompress via unvalidated recoder code values

• Severity: medium (CVSS 5.5 v3.1)
• 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: 2026-09-10 · updated 2026-09-14
• Weakness: CWE-787

Description

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, RecodedCharID::DeSerialize in src/ccutil/unicharcompress.h validates length_ but accepts negative code_ values from a crafted .traineddata recoder component. UnicharCompress::ComputeCodeRange in src/ccutil/unicharcompress.cpp can consequently produce code_range_ equal to zero, after which SetupDecoder indexes is_valid_start_ with the negative code on a size-zero vector. The resulting out-of-bounds bit write uses a large wrapped index and reliably causes a wild-address crash or allocation failure on the default LSTM engine. No fixed release is available as of this review.

Affected products

• tesseract-ocr tesseract: through 5.5.3

References

• https://github.com/tesseract-ocr/tesseract/commit/c94a5532ee04db5a4919542832fd94caee5ea58f
• https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7v9h-3q3m-w68g
• https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7v9h-3q3m-w68g

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