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CVE-2026-88051— Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields

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src/ccutil/genericvector.h中的GenericVector::read读取.traineddata模型时未对reserved和size_used_字段进行上限或不变量检查，特制的TESSDATA_INTTEMP组件可设置reserved为小值、size_

CVSS 8.6 · High EPSS 0.17% · P6 Updated Sep 15, 2026

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

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-2026-88051

Vulnerability Information

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Vulnerability Title

Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields

Source: CVE Program / CVE List V5

Vulnerability Description

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, the callback form of GenericVector::read in src/ccutil/genericvector.h reads the independent int32 fields reserved and size_used_ from a .traineddata model without a cap or an invariant check. reserve(reserved) allocates the backing array, but the callback loop writes size_used_ elements. A crafted TESSDATA_INTTEMP component with version_id 4 or later can therefore set reserved to a small value and size_used_ to a large value when fontinfo_table_.read(fp, read_info) is called from src/classify/intproto.cpp, causing a heap out-of-bounds write of FontInfo structures, heap corruption, a crash, or potentially controlled corruption. 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

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

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-2026-88051

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2026-88051

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Patches & Fixes for CVE-2026-88051 (1)

🔗 Validate vector counts in GenericVector::read · tesseract-ocr/tesseract@56e09ca · GitHub Read full article x_refsource_MISC

Vendor Advisories for CVE-2026-88051 (1)

🔗 Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields · Advisory · tesseract-ocr/tesseract · GitHub Read full article x_refsource_CONFIRM

https://www.cve.org/CVERecord?id=CVE-2026-88051

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-2026-88047	8.6 HIGH	Tesseract: ReadNormProtos stack buffer overflow
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-787