CVE-2026-88053Public exploit

Heap corruption via unvalidated traineddata template counts

Published Sep 10, 2026 · Updated Sep 10, 2026

Heap out-of-bounds write in Tesseract 5.5.3 and earlier allows attackers to corrupt memory by loading a crafted .traineddata file. Classify::ReadIntTemplates uses file-supplied NumClassPruners, NumClasses, and NumProtoSets as loop bounds for pointer stores into fixed-capacity arrays. The legacy classifier must load the malicious model; initialization then corrupts the heap and crashes the process or enables controlled corruption.

CVSS severity8.6
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Heap out-of-bounds write in Tesseract 5.5.3 and earlier allows attackers to corrupt memory by loading a crafted .traineddata file. Classify::ReadIntTemplates uses file-supplied NumClassPruners, NumClasses, and NumProtoSets as loop bounds for pointer stores into fixed-capacity arrays. The legacy classifier must load the malicious model; initialization then corrupts the heap and crashes the process or enables controlled corruption.

The record

CVE
CVE-2026-88053
Published
Sep 10, 2026
Updated
Sep 10, 2026
Vendor
Tesseract OCR
Product
Tesseract
Classifications
CWE-787, T1204.002
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Sep 10, 2026CVE publishedPublication date reported by the CVE source.
  2. Sep 10, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=<= 5.5.3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Tesseract OCR · Tesseractversion=<= 5.5.3

Published CVSS scores

8.6Tesseract OCR GitHub Security AdvisoryCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1204.002User Execution: Malicious File

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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