# CVE-2026-73067: libtesseract4: Tesseract is an open source OCR engine

CVE-2026-73067 is fixed in 4 products on 1 platform, first by libtesseract5 5.5.0-1ubuntu0.1~esm1, released September 10, 2026. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2026-73067
- Priority: Routine
- CVSS: n/a (Medium)
- EPSS: 0.0013
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Aug 11, 2026

## Description

Tesseract is an open source OCR engine. Prior to 5.5.3, a crafted .traineddata model loaded through TessBaseAPI::Init can cause SquishedDawg::read_squished_dawg in src/dict/dawg.cpp to accept an unterminated forward-edge run, after which SquishedDawg::Load calls num_forward_edges(0) and last_edge in src/dict/dawg.h reads beyond edges_, causing a heap out-of-bounds read and process crash before image processing. This issue is fixed in version 5.5.3.

## 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-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 opensuse-leap 16.0 | 5.5.3-bp160.1.1 | [OPENSUSE-SU-2026:21957-1](https://patchblox.com/security/data/fix/linux/opensuse-su-2026-21957-1.md) | Sep 24, 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 2026-11-08T00:53:09Z 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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