CVE-2026-88052: Tesseract is an open source OCR engine

Q: How do I fix CVE-2026-88052?

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

Q: Is CVE-2026-88052 being exploited?

CVE-2026-88052 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-2026-88052 affect?

CVE-2026-88052 affects tesseract ocr. Severity is high (CVSS 7.8). Tesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked index into the unichars vector. unic

Q: How urgent is CVE-2026-88052?

Priority 34/100. High severity; Public exploit reference

Routine

HIGH 7.8UPGRADE

CVE-2026-88052 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, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked index into the unichars vector. unichar_insert_backwards_compatible can leave the vector unchanged for an empty, duplicate, or already-encodable representation, causing id to become larger than unichars.size(). Subsequent set_* calls and the writ

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	None
User interaction	Required
EPSS exploit chance	0.2% (top 92%)
CISA exploited list	No
Weakness	CWE-129, 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 16:21 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-2026-88052?

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

Is CVE-2026-88052 being exploited?

CVE-2026-88052 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-2026-88052 affect?

CVE-2026-88052 affects tesseract ocr. Severity is high (CVSS 7.8). Tesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked index into the unichars vector. unic

How urgent is CVE-2026-88052?

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-2026-88053 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
CVE-2026-88049 MEDIUM 5.5 UPGRADE Tesseract is an open source OCR engine

References

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