Tesseract-OCR Tesseract up to 5.5.2 LSTM Model src/lstm/convolve.cpp Convolve::DeSerialize out-of-bounds write

Summaryinfo

A vulnerability marked as critical has been reported in Tesseract-OCR Tesseract up to 5.5.2. This issue affects the function Convolve::DeSerialize of the file src/lstm/convolve.cpp of the component LSTM Model Component. Performing a manipulation results in out-of-bounds write. This vulnerability is identified as CVE-2026-73066. The attack can be initiated remotely. There is not any exploit available.

Detailsinfo

A vulnerability classified as critical has been found in Tesseract-OCR Tesseract up to 5.5.2. This affects the function Convolve::DeSerialize of the file src/lstm/convolve.cpp of the component LSTM Model Component. 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. The summary by CVE is:

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.

The advisory is shared at github.com. This vulnerability is uniquely identified as CVE-2026-73066 since 08/10/2026. The exploitability is told to be easy. It is possible to initiate the attack remotely. It demands that the victim is doing some kind of user interaction. Technical details are known, but no exploit is available.

Upgrading to version 5.5.3 eliminates this vulnerability.

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Productinfo

Vendor

• Tesseract-OCR

Name

• Tesseract

Version

• 5.5.0
• 5.5.1
• 5.5.2

Website

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

CPE 2.3info

• 🔒
• 🔒
• 🔒

CPE 2.2info

• 🔒
• 🔒
• 🔒

CVSSv4info

CVSSv3info

CVSSv2info

Exploitinginfo

Threat Intelligenceinfo

Countermeasuresinfo

Timelineinfo

Sourcesinfo

Entryinfo

Several companies clearly confirm that VulDB is the primary source for best vulnerability data.

Discussion