Reference page — cumulative record through Sunday, October 4, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2026-88051

CVE-2026-88051HIGH

tesseract-ocr tesseract — Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   L   L   N   N   N   H   H   H    8.6   .0017    5.4     —

AFFECTED
  Product    Versions    Fixed
  tesseract  <= 5.5.3 –  —

TIMELINE
  Sep 9   Reserved by GitHub_M
  Sep 10  Published (CNA: GitHub_M)
  Sep 16  EXPLOIT PUBLISHED — CVE-2026-88051 (tesseract-ocr tesseract). Public exploit reference added.

CWE-787 · CNA: GitHub_M · CVSS v4.0 · 2 references · NVD status: Analyzed

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.

Lifecycle

Complete event history — 3 events, chronological
Date	Event	Detail
September 9, 2026	Reserved	Reserved by GitHub_M
September 10, 2026	Published	Published (CNA: GitHub_M)
September 16, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2026-88051 (tesseract-ocr tesseract). Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
tesseract-ocr	tesseract	—	<= 5.5.3	—

Weaknesses

CWE-787

References (2)

https://github.com/tesseract-ocr/tesseract/commit/56e09ca12e751623fe796ce1554ce704bffd2ef0 [Patch]
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-88qp-4g94-3rf3 [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-88051 at cve.org

Vendors: tesseract-ocr

Weaknesses: CWE-787

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2026-88051 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Sunday, October 4, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.