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Vulnerability record · CVE-2026-88049 · published 10 September 2026

CVE-2026-88049: Tesseract-ocr tesseract ocr out-of-bounds write vulnerability

Tesseract Ocr · Tesseract Ocr

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In LSTM::Forward in src/lstm/lstm.cpp, source_ is sized from the independently deserialized na_ field while the WriteTimeStepPart count is ns_, which comes from the CI gate WeightMatrix dim1() value. A crafted NT_LSTM layer can make ns_ much larger than na_, causing a heap out-of-bounds write during the first recognition step on the default LSTM engine and resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.

8.6 CVSS 4.0 High EPSS 0.14% · top 96.9% CWE-787 · Out-of-bounds write
8.6CVSS 4.0 base score
0.14%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, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In LSTM::Forward in src/lstm/lstm.cpp, source_ is sized from the independently deserialized na_ field while the WriteTimeStepPart count is ns_, which comes from the CI gate WeightMatrix dim1() value. A crafted NT_LSTM layer can make ns_ much larger than na_, causing a heap out-of-bounds write during the first recognition step on the default LSTM engine and resulting in heap corruption, a crash, 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/b494ac18925f9d9aff9ef5815475de9943ab19bf Patch
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-jgq8-pprg-vc68 Vendor Advisory
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-jgq8-pprg-vc68 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-2026-88047Tesseract-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%8.6CVE-2026-88048Tesseract-ocr tesseract ocr out-of-bounds read vulnerabilityTesseract is an open source OCR engine. In version 5.5.3 and earlier, FullyConnected::DeSerialize in src/lstm/fullyconnected.cpp does not validate th…EPSS 0.16%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-2026-88049), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.