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Vulnerability record · CVE-2026-88048 · published 10 September 2026

CVE-2026-88048: Tesseract-ocr tesseract ocr out-of-bounds read vulnerability

Tesseract Ocr · Tesseract Ocr

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.

8.6 CVSS 4.0 High EPSS 0.16% · top 95.5% CWE-125 · Out-of-bounds readCWE-787 · Out-of-bounds write
8.6CVSS 4.0 base score
0.16%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
14 Sep 2026Last modified by NVD

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.

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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://github.com/tesseract-ocr/tesseract/commit/103dc134eb36411ddc6833ec20aa2c76795bd0ff Patch
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-q44c-23p6-5mw6 Vendor Advisory
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-q44c-23p6-5mw6 Vendor Advisory

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Related vulnerabilities

Same products first, then exploited flaws of the same weakness class.

8.6CVE-2026-88051Tesseract-ocr tesseract ocr out-of-bounds write vulnerabilityTesseract 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 th…EPSS 0.18%8.6CVE-2026-88053Tesseract-ocr tesseract ocr out-of-bounds write vulnerabilityTesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadIntTemplates in src/classify/intproto.cpp reads NumClassPruners, …EPSS 0.18%8.6CVE-2026-88049Tesseract-ocr tesseract ocr out-of-bounds write vulnerabilityTesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGene…EPSS 0.14%8.6CVE-2026-88047Tesseract-ocr tesseract ocr stack-based buffer overflow vulnerabilityTesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadNormProtos in src/classify/normmatch.cpp parses the NORMPROTO com…EPSS 0.17%7.8CVE-2026-88052Tesseract-ocr tesseract ocr out-of-bounds write vulnerabilityTesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared uni…EPSS 0.18%7.8CVE-2021-36081Tesseract-ocr tesseract ocr use after free vulnerabilityTesseract OCR 5.0.0-alpha-20201231 has a one_ell_conflict use-after-free during a strpbrk call.EPSS 0.89%6.9CVE-2026-88054Tesseract-ocr tesseract ocr out-of-bounds read vulnerabilityTesseract is an open source OCR engine. In version 5.5.3 and earlier, Plumbing::DeSerialize in src/lstm/plumbing.cpp rejects excessively large networ…EPSS 0.15%6.9CVE-2026-88050Tesseract-ocr tesseract ocr out-of-bounds write vulnerabilityTesseract is an open source OCR engine. In version 5.5.3 and earlier, RecodedCharID::DeSerialize in src/ccutil/unicharcompress.h validates length_ bu…EPSS 0.14%

Source: NIST National Vulnerability Database (record CVE-2026-88048), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.