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-2026-88053

CVE-2026-88053HIGH

tesseract-ocr tesseract — Tesseract: Heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts in crafted .traineddata

  AV  AC  AT  PR  UI  VC  VI  VA   CVSS    EPSS   %ile   KEV
   L   L   N   N   N   H   H   H    8.6   .0018    6.4     —

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-2026-88053 (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, Classify::ReadIntTemplates in src/classify/intproto.cpp reads NumClassPruners, NumClasses, and NumProtoSets from the TESSDATA_INTTEMP component of a crafted .traineddata file and uses those values as loop bounds without validating them against MAX_NUM_CLASS_PRUNERS, MAX_NUM_CLASSES, and MAX_NUM_PROTO_SETS. The loops store heap pointers into fixed-capacity ClassPruners and ProtoSets arrays in INT_TEMPLATES_STRUCT and INT_CLASS_STRUCT, so an oversized count causes heap out-of-bounds pointer writes during legacy-classifier initialization before OCR begins, resulting in 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-2026-88053 (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/8b0574680f3b22f246ade6a4c8e3029104255c63 [Patch]
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-rphx-x795-5qjv [Exploit, Mitigation, Vendor Advisory]

Authoritative record: CVE-2026-88053 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-2026-88053 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.