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

Quick assessment

Affected
tesseract-ocr tesseract
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

tesseract-ocr tesseract是tesseract-ocr组织的一款光学字符识别引擎。 tesseract-ocr tesseract 5.5.3之前版本存在缓冲区错误漏洞，该漏洞源于反序列化器加载特制的.traineddata LSTM模型组件时，Convolve::DeSerialize中存在未检查的带符号整数乘法，导致卷积输出通道数回绕，使前向传递输出缓冲区大小不足，写入时使用未回绕的元素计数，从而造成堆越界写入。

CVSS 6.8 · Medium EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 1

VendorProduct Version RangeStatus
tesseract-ocr tesseract < 5.5.3 affected
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I. Basic Information for CVE-2026-73066

Vulnerability Information
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Vulnerability Title
Tesseract: Heap out-of-bounds write in LSTM Convolve layer via crafted .traineddata
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:H/VA:H/SC:N/SI:N/SA:N
Source: CVE Program / CVE List V5
Vulnerability Type
跨界内存写
Source: CVE Program / CVE List V5
Vulnerability Title
tesseract-ocr tesseract 缓冲区错误漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
tesseract-ocr tesseract是tesseract-ocr组织的一款光学字符识别引擎。 tesseract-ocr tesseract 5.5.3之前版本存在缓冲区错误漏洞，该漏洞源于反序列化器加载特制的.traineddata LSTM模型组件时，Convolve::DeSerialize中存在未检查的带符号整数乘法，导致卷积输出通道数回绕，使前向传递输出缓冲区大小不足，写入时使用未回绕的元素计数，从而造成堆越界写入。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
tesseract-ocr tesseract < 5.5.3 -

II. Public POCs for CVE-2026-73066

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III. Intelligence Information for CVE-2026-73066

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Patches & Fixes for CVE-2026-73066 (3)

Vendor Advisories for CVE-2026-73066 (1)

IV. Related Vulnerabilities

Same product: tesseract
Same vendor: tesseract-ocr
Same weakness: CWE-787

V. Comments for CVE-2026-73066

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