tesseract-ocr Tesseract up to 5.5.3 Intproto intproto.cpp ReadIntTemplates out-of-bounds write

Summaryinfo

A vulnerability labeled as critical has been found in tesseract-ocr Tesseract up to 5.5.3. This vulnerability affects the function Classify::ReadIntTemplates of the file src/classify/intproto.cpp of the component Intproto. The manipulation results in out-of-bounds write. This vulnerability is cataloged as CVE-2026-88053. The attack may be launched remotely. There is no exploit available.

Detailsinfo

A vulnerability classified as critical has been found in tesseract-ocr Tesseract up to 5.5.3. Affected is the function Classify::ReadIntTemplates of the file src/classify/intproto.cpp of the component Intproto. The manipulation with an unknown input leads to a out-of-bounds write vulnerability. CWE is classifying the issue as CWE-787. The product writes data past the end, or before the beginning, of the intended buffer. This is going to have an impact on confidentiality, integrity, and availability. CVE summarizes:

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadIntTemplates in src/classify/intproto.cpp reads NumClassPruners, NumClasses, and NumProtoSets from the TESSDATA_INTTEMP component of a crafted .traineddata file and uses those values as loop bounds without validating them against MAX_NUM_CLASS_PRUNERS, MAX_NUM_CLASSES, and MAX_NUM_PROTO_SETS. The loops store heap pointers into fixed-capacity ClassPruners and ProtoSets arrays in INT_TEMPLATES_STRUCT and INT_CLASS_STRUCT, so an oversized count causes heap out-of-bounds pointer writes during legacy-classifier initialization before OCR begins, resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.

The advisory is available at github.com. This vulnerability is traded as CVE-2026-88053 since 09/09/2026. The exploitability is told to be easy. It is possible to launch the attack remotely. Technical details are known, but there is no available exploit. The structure of the vulnerability defines a possible price range of USD $0-$5k at the moment (estimation calculated on 09/10/2026).

There is no information about possible countermeasures known. It may be suggested to replace the affected object with an alternative product.

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Productinfo

Vendor

• tesseract-ocr

Name

• Tesseract

Version

• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3

Website

• Product: https://github.com/tesseract-ocr/tesseract/

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