Out-of-bounds write in tesseract - CVE-2026-73066

Vulnerability identifier: #VU140986

CSH Severity: Medium

CVSS v4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:A/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

CVE-ID: CVE-2026-73066

CWE-ID: CWE-787

Exploitation vector: Remote access

Exploit availability: No public exploit available

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to out-of-bounds write in the LSTM Convolve layer when parsing a crafted .traineddata LSTM model component during ordinary OCR recognition. A remote attacker can supply a specially crafted .traineddata file to cause a denial of service.

The issue is triggered after the malicious model file is loaded through Tesseract's .traineddata deserializer.

tesseract
Red Hat CodeReady Linux Builder for IBM z Systems
Red Hat CodeReady Linux Builder for ARM 64
Red Hat CodeReady Linux Builder for Power, little endian
Red Hat CodeReady Linux Builder for x86_64
Red Hat Enterprise Linux for ARM 64
Red Hat Enterprise Linux for Power, little endian
Red Hat Enterprise Linux for IBM z Systems
Red Hat Enterprise Linux for x86_64
Red Hat Enterprise Linux Server - AUS
Red Hat Enterprise Linux Server - TUS
openEuler
Red Hat Enterprise Linux Server for Power LE - Update Services for SAP Solutions
tesseract (Red Hat package)
tesseract-debugsource
tesseract-tools
tesseract-devel
tesseract-debuginfo
tesseract

Install security update from vendor's website.

tesseract - update to 5.5.3
tesseract (Red Hat package) - addressed in versions 4.1.1-2.el8_6.1, 4.1.1-2.el8_8.1, 4.1.1-3.el8_10, 4.1.1-8.el9_8, 5.3.4-7.el10_2
tesseract-debugsource - update to 5.5.3-1
tesseract-tools - update to 5.5.3-1
tesseract-devel - update to 5.5.3-1
tesseract-debuginfo - update to 5.5.3-1
tesseract - update to 5.5.3-1

• https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-7j76-5rq5-5jg8

• Multiple vulnerabilities in tesseract
• openEuler 24.03 LTS SP3 update for tesseract
• openEuler 24.03 LTS SP1 update for tesseract
• openEuler 22.03 LTS SP4 update for tesseract
• openEuler 24.03 LTS SP4 update for tesseract
• Red Hat Enterprise Linux 10 update for tesseract
• Red Hat Enterprise Linux 9 update for tesseract
• Red Hat Enterprise Linux 8 update for tesseract
• Red Hat Enterprise Linux 8 update for tesseract
• Red Hat Enterprise Linux 8 update for tesseract