TI-2026-60073 Aliases CVE-2026-88053

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

HIGH 72CWE-787Published 2026-09-10 · Updated 2026-09-11

Key facts

Attack vector: Local
Privileges required: None
User interaction: None
Attack complexity: Low
Attack requirements: None
Impact type: Code execution
Confidentiality · integrity · availability: High · High · High
Fix status: Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and Red Hat. Impact type from CWE-787 and the CVSS impact.

Summary

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.

Why it matters now

Exploitation Proof of concept CISA SSVC · not in CISA KEV

EPSS 0.00171 6th percentileScored 2026-11-07

Public exploit Yes 1 exploit referenceTagged by NVD

Fix Fixed Red Hat: 3 advisories

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation: Poc
Automatable: No
Technical impact: Total

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

Vendor	Product	Affected versions	Fixed in	Status	Source
tesseract-ocr	tesseract	up to 5.5.3	—	No fix listed	CNA

tesseract Vendortesseract-ocr Affected up to 5.5.3 Fixed in — No fix listed CNA

CPE configurations NVD · 1

CPE	Versions	Role	Vendor
cpe:2.3:a:tesseract-ocr:tesseract_ocr::::::::	up to 5.5.3	Vulnerable	tesseract-ocr

cpe:2.3:a:tesseract-ocr:tesseract_ocr:*:*:*:*:*:*:*:* Versions up to 5.5.3 Vulnerable ·tesseract-ocr

Remediation

Red Hat 3 advisories

RHSA-2026:95725 Released 2026-11-05 · Red Hat rating Important
tesseract security update
- Red Hat Enterprise Linux AppStream (v. 8) tesseract-4.1.1-7.el8_10
- Red Hat Enterprise Linux CRB (v. 8) tesseract-devel-4.1.1-7.el8_10
RHSA-2026:95086 Released 2026-11-04 · Red Hat rating Important
tesseract security update
- Red Hat Enterprise Linux AppStream (v. 9) tesseract-4.1.1-11.el9_8
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) tesseract-devel-4.1.1-11.el9_8
RHSA-2026:95085 Released 2026-11-04 · Red Hat rating Important
tesseract security update
- Red Hat Enterprise Linux AppStream (v. 10) tesseract-5.3.4-11.el10_2
- Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) tesseract-devel-5.3.4-11.el10_2

Vendor assessments

Red Hat

Red Hat rating: Important. Red Hat's page for this CVE →

Product	Status	Plan or fix
Red Hat Enterprise Linux AppStream (v. 10)	Fixed	RHSA-2026:95085
Red Hat Enterprise Linux AppStream (v. 8)	Fixed	RHSA-2026:95725
Red Hat Enterprise Linux AppStream (v. 9)	Fixed	RHSA-2026:95086
Red Hat Enterprise Linux CRB (v. 8)	Fixed	RHSA-2026:95725
Red Hat Enterprise Linux CodeReady Linux Builder (v. 10)	Fixed	RHSA-2026:95085
Red Hat Enterprise Linux CodeReady Linux Builder (v. 9)	Fixed	RHSA-2026:95086

Timeline

2026-10-02 Threatist record created from CVE-2026-88053
2026-11-04 Fix available: RHSA-2026:95085 · Red Hat
2026-11-04 Fix available: Red Hat Enterprise Linux AppStream (v. 10), Red Hat Enterprise Linux CodeReady Linux Builder (v. 10) · Red Hat
2026-11-05 Fix available: Red Hat Enterprise Linux AppStream (v. 9), Red Hat Enterprise Linux CodeReady Linux Builder (v. 9) · Red Hat
2026-11-06 Fix available: RHSA-2026:95086 · Red Hat
2026-11-06 Fix available: Red Hat Enterprise Linux AppStream (v. 8), Red Hat Enterprise Linux CRB (v. 8) · Red Hat
2026-11-06 Fix available: RHSA-2026:95725 · Red Hat

References

Exploit 1

https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-rphx-x795-5qjv

Patch 1

https://github.com/tesseract-ocr/tesseract/commit/8b0574680f3b22f246ade6a4c8e3029104255c63

TI-2026-60071 Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields CVSS 4.0HIGH 8.6
TI-2026-60069 Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch CVSS 4.0HIGH 8.6
TI-2026-60068 Tesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matrix dimension mismatch CVSS 4.0HIGH 8.6
TI-2026-60074 Tesseract: Denial of service via empty-stack dereference in Plumbing/Series at model load CVSS 4.0MEDIUM 6.9
TI-2026-60070 Tesseract: Out-of-bounds write in UnicharCompress via unvalidated recoder code values CVSS 4.0MEDIUM 6.9
TI-2026-60067 Tesseract: ReadNormProtos stack buffer overflow CVSS 4.0HIGH 8.6

See all 10 →

Sources

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