# CVE-2026-73066: tesseract: A commercial quality OCR engine originally developed at HP between 1985 and 1995

CVE-2026-73066 is fixed in 6 products on 1 platform, first by RHSA-2026:71566, released August 11, 2026. It is not reported as exploited. Patch Radar priority: High.

- Web page: https://patchblox.com/security/cve/CVE-2026-73066
- Priority: High
- CVSS: 7.1 (Important)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 11, 2026

## Description

A commercial quality OCR engine originally developed at HP between 1985 and 1995. In 1995, this engine was among the top 3 evaluated by UNLV. It was open-sourced by HP and UNLV in 2005.  Security Fix(es):  * tesseract: Tesseract: Heap out-of-bounds write via crafted .traineddata (CVE-2026-73066)  For more details about the security issue(s), including the impact, a CVSS score, acknowledgments, and other related information, refer to the CVE page(s) listed in the References section.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | libtesseract4 Ubuntu 18.04.6 LTS (bionic) | 4.00~git2288-10f4998a-2ubuntu0.1~esm1 | [libtesseract4 4.00~git2288-10f4998a-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-libtesseract4-4.00-git2288-10f4998a-2ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | libtesseract4 Ubuntu 20.04 LTS (focal) | 4.1.1-2ubuntu0.1~esm1 | [libtesseract4 4.1.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-libtesseract4-4.1.1-2ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | libtesseract4 Ubuntu 22.04.1 LTS (jammy) | 4.1.1-2.1ubuntu0.1~esm1 | [libtesseract4 4.1.1-2.1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-libtesseract4-4.1.1-2.1ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | libtesseract5 Ubuntu 24.04.5 LTS (noble) | 5.3.4-1ubuntu0.1~esm1 | [libtesseract5 5.3.4-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-libtesseract5-5.3.4-1ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | libtesseract5 Ubuntu 26.04.1 LTS (resolute) | 5.5.0-1ubuntu0.1~esm1 | [libtesseract5 5.5.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-libtesseract5-5.5.0-1ubuntu0.1-esm1.md) | Sep 10, 2026 |
| Linux | tesseract RHEL 10 | 5.3.4-6.el10_0.1 | [RHSA-2026:71566](https://patchblox.com/security/data/fix/linux/rhsa-2026-71566.md) | Aug 11, 2026 |
| Linux | tesseract RHEL 8 | 0:4.1.1-3.el8_10 | [RHSA-2026:67832](https://patchblox.com/security/data/fix/linux/rhsa-2026-67832.md) | Sep 19, 2026 |
| Linux | tesseract RHEL 9 | 0:4.1.1-8.el9_8 | [RHSA-2026:67831](https://patchblox.com/security/data/fix/linux/rhsa-2026-67831.md) | Sep 19, 2026 |
| Linux | tesseract almalinux 8 | 4.1.1-3.el8_10 | [ALSA-2026:67832](https://patchblox.com/security/data/fix/linux/alsa-2026-67832.md) | Sep 16, 2026 |
| Linux | tesseract almalinux 9 | 4.1.1-8.el9_8 | [ALSA-2026:67831](https://patchblox.com/security/data/fix/linux/alsa-2026-67831.md) | Sep 16, 2026 |
| Linux | tesseract ol 10 | 0:5.3.4-7.el10_2 | [ELSA-2026-67830](https://patchblox.com/security/data/fix/linux/elsa-2026-67830.md) | Sep 16, 2026 |
| Linux | tesseract ol 8 | 0:4.1.1-3.el8_10 | [ELSA-2026-67832](https://patchblox.com/security/data/fix/linux/elsa-2026-67832.md) | Sep 16, 2026 |
| Linux | tesseract ol 9 | 0:4.1.1-8.el9_8 | [ELSA-2026-67831](https://patchblox.com/security/data/fix/linux/elsa-2026-67831.md) | Sep 16, 2026 |
| Linux | tesseract rocky 10 | 0:5.3.4-7.el10_2 | [RLSA-2026:67830](https://patchblox.com/security/data/fix/linux/rlsa-2026-67830.md) | Sep 17, 2026 |
| Linux | tesseract rocky 8 | 0:4.1.1-3.el8_10 | [RLSA-2026:67832](https://patchblox.com/security/data/fix/linux/rlsa-2026-67832.md) | Sep 17, 2026 |
| Linux | tesseract rocky 9 | 0:4.1.1-8.el9_8 | [RLSA-2026:67831](https://patchblox.com/security/data/fix/linux/rlsa-2026-67831.md) | Sep 17, 2026 |
| Linux | tesseract-devel RHEL 8 | 0:4.1.1-3.el8_10 | [RHSA-2026:67832](https://patchblox.com/security/data/fix/linux/rhsa-2026-67832.md) | Sep 19, 2026 |
| Linux | tesseract-devel RHEL 9 | 0:4.1.1-8.el9_8 | [RHSA-2026:67831](https://patchblox.com/security/data/fix/linux/rhsa-2026-67831.md) | Sep 19, 2026 |
| Linux | tesseract-devel almalinux 8 | 4.1.1-3.el8_10 | [ALSA-2026:67832](https://patchblox.com/security/data/fix/linux/alsa-2026-67832.md) | Sep 16, 2026 |
| Linux | tesseract-devel almalinux 9 | 4.1.1-8.el9_8 | [ALSA-2026:67831](https://patchblox.com/security/data/fix/linux/alsa-2026-67831.md) | Sep 16, 2026 |
| Linux | tesseract-devel ol 10 | 0:5.3.4-7.el10_2 | [ELSA-2026-67830](https://patchblox.com/security/data/fix/linux/elsa-2026-67830.md) | Sep 16, 2026 |
| Linux | tesseract-devel ol 8 | 0:4.1.1-3.el8_10 | [ELSA-2026-67832](https://patchblox.com/security/data/fix/linux/elsa-2026-67832.md) | Sep 16, 2026 |
| Linux | tesseract-devel ol 9 | 0:4.1.1-8.el9_8 | [ELSA-2026-67831](https://patchblox.com/security/data/fix/linux/elsa-2026-67831.md) | Sep 16, 2026 |
| Linux | tesseract-ocr Ubuntu 18.04.6 LTS (bionic) | 4.00~git2288-10f4998a-2ubuntu0.1~esm1 | [tesseract-ocr 4.00~git2288-10f4998a-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tesseract-ocr-4.00-git2288-10f4998a-2ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | tesseract-ocr Ubuntu 20.04 LTS (focal) | 4.1.1-2ubuntu0.1~esm1 | [tesseract-ocr 4.1.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tesseract-ocr-4.1.1-2ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | tesseract-ocr Ubuntu 22.04.1 LTS (jammy) | 4.1.1-2.1ubuntu0.1~esm1 | [tesseract-ocr 4.1.1-2.1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-tesseract-ocr-4.1.1-2.1ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | tesseract-ocr Ubuntu 24.04.5 LTS (noble) | 5.3.4-1ubuntu0.1~esm1 | [tesseract-ocr 5.3.4-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-tesseract-ocr-5.3.4-1ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | tesseract-ocr Ubuntu 26.04.1 LTS (resolute) | 5.5.0-1ubuntu0.1~esm1 | [tesseract-ocr 5.5.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-tesseract-ocr-5.5.0-1ubuntu0.1-esm1.md) | Sep 10, 2026 |
| Linux | tesseract-ocr-all Ubuntu 18.04.6 LTS (bionic) | 4.00~git2288-10f4998a-2ubuntu0.1~esm1 | [tesseract-ocr-all 4.00~git2288-10f4998a-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-bionic-tesseract-ocr-all-4.00-git2288-10f4998a-2ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | tesseract-ocr-all Ubuntu 20.04 LTS (focal) | 4.1.1-2ubuntu0.1~esm1 | [tesseract-ocr-all 4.1.1-2ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-focal-tesseract-ocr-all-4.1.1-2ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | tesseract-ocr-all Ubuntu 22.04.1 LTS (jammy) | 4.1.1-2.1ubuntu0.1~esm1 | [tesseract-ocr-all 4.1.1-2.1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-jammy-tesseract-ocr-all-4.1.1-2.1ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | tesseract-ocr-all Ubuntu 24.04.5 LTS (noble) | 5.3.4-1ubuntu0.1~esm1 | [tesseract-ocr-all 5.3.4-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-noble-tesseract-ocr-all-5.3.4-1ubuntu0.1-esm1.md) | Oct 7, 2026 |
| Linux | tesseract-ocr-all Ubuntu 26.04.1 LTS (resolute) | 5.5.0-1ubuntu0.1~esm1 | [tesseract-ocr-all 5.5.0-1ubuntu0.1~esm1](https://patchblox.com/security/data/fix/linux/ubuntu-resolute-tesseract-ocr-all-5.5.0-1ubuntu0.1-esm1.md) | Sep 10, 2026 |

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Data as of 2026-11-08T13:06:02Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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