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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 是一个开源的光学字符识别（OCR）引擎。在 5.5.3 及更早版本中， 中 的回调形式在从 模型文件中读取独立的 字段 和 时，既没有设置上限，也没有进行不变量检查。调用 用于分配底层数组，但随后的回调循环会写入 个元素。因此，一个精心构造的 组件（其 为 4 或更高版本），当从 中调用 时，可以将 设置为一个较小的值，同时将 设置为一个较大的值，从而导致对 结构体发生堆越界写入、堆内存损坏、程序崩溃，甚至可能导致可控制的内存损坏。截至本次安全审查，尚未发布修复版本。

CVSS 8.6 · High
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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

Affected Products

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

II. Public POCs for CVE-2026-88051

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III. Intelligence Information for CVE-2026-88051

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

Other References for CVE-2026-88051 (1)

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

V. Comments for CVE-2026-88051

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