CVE-2026-88054: Tesseract is an open source OCR engine

Q: How do I fix CVE-2026-88054?

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

Q: Is CVE-2026-88054 being exploited?

CVE-2026-88054 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-2026-88054 affect?

CVE-2026-88054 affects tesseract ocr. Severity is medium (CVSS 5.5). Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Plumbing::DeSerialize in src/lstm/plumbing.cpp rejects excessively large network stacks but accepts a zero-length stack for NT_SERIES, NT_PARALLEL, or NT_REVERSED layers

Q: How urgent is CVE-2026-88054?

Priority 25/100. Public exploit reference

Routine

MEDIUM 5.5UPGRADE

CVE-2026-88054 is a medium-severity flaw (CVSS 5.5) 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, Plumbing::DeSerialize in src/lstm/plumbing.cpp rejects excessively large network stacks but accepts a zero-length stack for NT_SERIES, NT_PARALLEL, or NT_REVERSED layers in a crafted .traineddata model. During LSTMRecognizer initialization in src/lstm/lstmrecognizer.cpp, CacheXScaleFactor(XScaleFactor()) reaches Series::CacheXScaleFactor in src/lstm/series.cpp, which dereferenc

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	5.5 (Medium)
Attack vector	Local
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.2% (top 96%)
CISA exploited list	No
Weakness	CWE-125, CWE-824
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-2026-88054?

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

Is CVE-2026-88054 being exploited?

CVE-2026-88054 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-2026-88054 affect?

CVE-2026-88054 affects tesseract ocr. Severity is medium (CVSS 5.5). Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Plumbing::DeSerialize in src/lstm/plumbing.cpp rejects excessively large network stacks but accepts a zero-length stack for NT_SERIES, NT_PARALLEL, or NT_REVERSED layers

How urgent is CVE-2026-88054?

Priority 25/100. 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-2026-88053 HIGH 7.8 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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