Tesseract up to 5.5.3 recoder unicharcompress.h DeSerialize code_ memory corruption

Summaryinfo

A vulnerability categorized as problematic has been discovered in Tesseract up to 5.5.3. This impacts the function RecodedCharID::DeSerialize of the file src/ccutil/unicharcompress.h of the component recoder. Such manipulation of the argument code_ leads to memory corruption. This vulnerability is listed as CVE-2026-88050. The attack may be performed from remote. There is no available exploit.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Tesseract up to 5.5.3. Affected by this issue is the function RecodedCharID::DeSerialize of the file src/ccutil/unicharcompress.h of the component recoder. The manipulation of the argument code_ with an unknown input leads to a memory corruption vulnerability. Using CWE to declare the problem leads to CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. Impacted is availability. CVE summarizes:

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.

The advisory is available at github.com. This vulnerability is handled as CVE-2026-88050 since 09/09/2026. The exploitation is known to be easy. The attack may be launched remotely. Successful exploitation requires user interaction by the victim. 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

Name

• Tesseract

Version

• 5.5.0
• 5.5.1
• 5.5.2
• 5.5.3

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CPE 2.2info

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