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Vulnerability record · CVE-2026-88051 · published 10 September 2026

CVE-2026-88051: 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, 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.

8.6 CVSS 4.0 High EPSS 0.17% · top 94.7% CWE-787 · Out-of-bounds write
8.6CVSS 4.0 base score
0.17%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References, 2 tagged exploit
16 Sep 2026Last modified by NVD

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.

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/56e09ca12e751623fe796ce1554ce704bffd2ef0 Patch
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-88qp-4g94-3rf3 ExploitMitigationVendor Advisory
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-88qp-4g94-3rf3 ExploitMitigationVendor Advisory

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Related vulnerabilities

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

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 0.15%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 0.11%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 0.17%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 0.15%

Source: NIST National Vulnerability Database (record CVE-2026-88051), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.