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CVE-2026-88048— Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matrix dimension mismatch

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 OCR（光学字符识别）引擎。在版本 5.5.3 及更早版本中， 中的 函数在对反序列化的层标量 和 进行验证时，未将其与权重矩阵的维度进行一致性校验。 在 执行过程中， 中的 会将 个结果写入 （其大小由 决定），并从 （其大小由 决定）中读取 个输入。因此，一个精心构造的 文件中的 层可以利用不一致的维度，在默认 LSTM 引擎中引发堆越界写入和越界读取，从而导致堆损坏、程序崩溃、信息泄露，甚至可能被利用实现受控的内存破坏。截至本次评估，尚未发布修复版本。

CVSS 8.6 · High

Possible ATT&CK Techniques 1 AI

T1204 · User Execution
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I. Basic Information for CVE-2026-88048

Vulnerability Information
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Vulnerability Title
Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matrix dimension mismatch
Source: CVE Program / CVE List V5
Vulnerability Description
Tesseract is an open source OCR engine. In version 5.5.3 and earlier, FullyConnected::DeSerialize in src/lstm/fullyconnected.cpp does not validate the deserialized layer scalars ni_ and no_ against the weight-matrix dimensions. During FullyConnected::Forward, MatrixDotVector in src/lstm/weightmatrix.cpp writes w.dim1() results into temp_line, which is sized from no_, and reads w.dim2() minus one inputs from curr_input, which is sized from ni_. A crafted .traineddata NT_SOFTMAX layer can therefore use inconsistent dimensions to cause a heap out-of-bounds write and read on the default LSTM engine, resulting in heap corruption, a crash, information disclosure, 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
跨界内存读
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-2026-88048

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III. Intelligence Information for CVE-2026-88048

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Patches & Fixes for CVE-2026-88048 (1)

Vendor Advisories for CVE-2026-88048 (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-2026-88047 8.6 HIGH Tesseract: ReadNormProtos stack buffer overflow
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-125

V. Comments for CVE-2026-88048

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