CVE-2026-88053: Tesseract is an open source OCR engine

Q: How do I fix CVE-2026-88053?

tesseract ocr: upgrade to newer than 5.5.3. Exact commands for each OS are on this page.

Q: Is CVE-2026-88053 being exploited?

CVE-2026-88053 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-88053 affect?

CVE-2026-88053 affects tesseract ocr. Severity is high (CVSS 7.8). 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

Q: How urgent is CVE-2026-88053?

Priority 34/100. High severity; Public exploit reference

Routine

HIGH 7.8UPGRADE

CVE-2026-88053 is a high-severity flaw (CVSS 7.8) affecting tesseract ocr. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 Proto

Why this priority

High severity
Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	7.8 (High)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 93%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-09-10
Last modified	2026-09-16

Publisher (CNA): GitHub, Inc. · Vendor: tesseract-ocr

Last updated 2026-09-16 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-10 18:18 UTCPublished CVE record published
2026-09-16 16:14 UTCUpdated Record last modified

tesseract-ocr tesseract ocr UPGRADE

Affected: <= 5.5.3

Fixed in: newer than 5.5.3

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy tesseract-ocr || rpm -q tesseract-ocr || tesseract-ocr --version

2. UPGRADE to newer than 5.5.3 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade tesseract-ocr

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade tesseract-ocr

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-88053?

tesseract ocr: upgrade to newer than 5.5.3. Exact commands for each OS are on this page.

Is CVE-2026-88053 being exploited?

CVE-2026-88053 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-88053 affect?

CVE-2026-88053 affects tesseract ocr. Severity is high (CVSS 7.8). 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

How urgent is CVE-2026-88053?

Priority 34/100. High severity; Public exploit reference

Related CVEs

CVE-2026-88051 HIGH 7.8 UPGRADE Tesseract is an open source OCR engine
CVE-2026-88052 HIGH 7.8 UPGRADE Tesseract is an open source OCR engine
CVE-2026-88054 MEDIUM 5.5 UPGRADE Tesseract is an open source OCR engine
CVE-2026-88050 MEDIUM 5.5 UPGRADE Tesseract is an open source OCR engine
CVE-2026-88049 MEDIUM 5.5 UPGRADE Tesseract is an open source OCR engine

References

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