CVE-2026-88049: Tesseract is an open source OCR engine

Q: How do I fix CVE-2026-88049?

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

Q: Is CVE-2026-88049 being exploited?

CVE-2026-88049 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-2026-88049 affect?

CVE-2026-88049 affects tesseract ocr. Severity is medium (CVSS 5.5). Tesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPar

Q: How urgent is CVE-2026-88049?

Priority 20/100. No elevated risk signals yet.

Routine

MEDIUM 5.5UPGRADE

CVE-2026-88049 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, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In LSTM::Forward in src/lstm/lstm.cpp, source_ is sized from the independently deserialized na_ field while the WriteTimeStepPart count is ns_, which comes from the C

Why this priority

No elevated risk signals yet

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	0.1% (top 96%)
CISA exploited list	No
Weakness	CWE-787
Published	2026-09-10
Last modified	2026-09-14

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

Last updated 2026-09-14 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-09-10 17:17 UTCPublished CVE record published
2026-09-14 20:01 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-2026-88049?

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

Is CVE-2026-88049 being exploited?

CVE-2026-88049 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-2026-88049 affect?

CVE-2026-88049 affects tesseract ocr. Severity is medium (CVSS 5.5). Tesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPar

How urgent is CVE-2026-88049?

Priority 20/100. No elevated risk signals yet.

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-2026-88054 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

References

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