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CVE-2026-88047— Tesseract: ReadNormProtos stack buffer overflow

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组织的一款可将图像文字转换为可编辑文本的光学字符识别组件。 tesseract-ocr Tesseract 5.5.3及之前版本存在缓冲区错误漏洞，该漏洞源于Classify::ReadNormProtos在解析src/classify/normmatch.cpp中.traineddata文件的NORMPROTO组件时，使用std::istream::operator>>(char*)提取令牌未设置流宽度，在TessBaseAPI:

CVSS 8.6 · High EPSS 0.11% · P2 Updated Sep 12, 2026

Possible ATT&CK Techniques 2 AI

T1190 · Exploit Public-Facing Application T1204 · User Execution

Affected Version Matrix 1

Vendor	Product	Version Range	Status
tesseract-ocr	tesseract	`<= 5.5.3`	affected

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I. Basic Information for CVE-2026-88047

Vulnerability Information

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Vulnerability Title

Tesseract: ReadNormProtos stack buffer overflow

Source: CVE Program / CVE List V5

Vulnerability Description

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadNormProtos in src/classify/normmatch.cpp parses the NORMPROTO component of a .traineddata file and uses std::istream::operator>>(char*) to extract a whitespace-delimited token into a fixed 61-byte stack buffer without setting a stream width. The 100-byte line buffer can carry a token of up to 99 characters, so a token longer than 60 characters writes up to 39 attacker-controlled bytes past the buffer during TessBaseAPI::Init of the legacy engine, causing stack corruption, denial of service, and potentially control-flow hijacking on affected standard-library implementations. Builds using Apple's libc++ C++20 bounded array overload are incidentally protected, while typical libstdc++ builds remain affected. No fixed release is available as of this review.

Source: CVE Program / CVE List V5

CVSS Information

CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

Source: CVE Program / CVE List V5

Vulnerability Type

栈缓冲区溢出

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

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-2026-88047

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-88047

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Patches & Fixes for CVE-2026-88047 (1)

🔗 Limit unichar extraction in ReadNormProtos to the buffer size · tesseract-ocr/tesseract@1bda507 · GitHub Read full article x_refsource_MISC

Vendor Advisories for CVE-2026-88047 (1)

🔗 ReadNormProtos stack buffer overflow · Advisory · tesseract-ocr/tesseract · GitHub Read full article x_refsource_CONFIRM

https://www.cve.org/CVERecord?id=CVE-2026-88047

Same Patch Batch · tesseract-ocr · 2026-09-10 · 8 CVEs total

CVE-2026-88049	8.6 HIGH	Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatc
CVE-2026-88048	8.6 HIGH	Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matri
CVE-2026-88051	8.6 HIGH	Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/
CVE-2026-88053	8.6 HIGH	Tesseract: Heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts i
CVE-2026-88052	7.8 HIGH	Tesseract: Heap out-of-bounds write in UNICHARSET::load_via_fgets via count/insert desynch
CVE-2026-88050	6.9 MEDIUM	Tesseract: Out-of-bounds write in UnicharCompress via unvalidated recoder code values
CVE-2026-88054	6.9 MEDIUM	Tesseract: Denial of service via empty-stack dereference in Plumbing/Series at model load

IV. Related Vulnerabilities

Same product: tesseract

Same vendor: tesseract-ocr

Same weakness: CWE-121