libtesseract4: Tesseract is an open source OCR engine
CVE-2026-88050 is fixed in 19 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.
Tesseract is an open source OCR engine. In version 5.5.3 and earlier, RecodedCharID::DeSerialize in src/ccutil/unicharcompress.h validates length_ but accepts negative code_ values from a crafted .traineddata recoder component. UnicharCompress::ComputeCodeRange in src/ccutil/unicharcompress.cpp can consequently produce code_range_ equal to zero, after which SetupDecoder indexes is_valid_start_ with the negative code on a size-zero vector. The resulting out-of-bounds bit write uses a large wrapped index and reliably causes a wild-address crash or allocation failure on the default LSTM engine. No fixed release is available as of this review.
Where it's fixed
| 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 | Oct 7, 2026 |
| libtesseract4 · Ubuntu 20.04 LTS (focal) | 4.1.1-2ubuntu0.1~esm1 | libtesseract4 4.1.1-2ubuntu0.1~esm1 | Oct 7, 2026 |
| libtesseract4 · Ubuntu 22.04.1 LTS (jammy) | 4.1.1-2.1ubuntu0.1~esm1 | libtesseract4 4.1.1-2.1ubuntu0.1~esm1 | Oct 7, 2026 |
| libtesseract5 · Ubuntu 24.04.5 LTS (noble) | 5.3.4-1ubuntu0.1~esm1 | libtesseract5 5.3.4-1ubuntu0.1~esm1 | Oct 7, 2026 |
| libtesseract5 · Ubuntu 26.04.1 LTS (resolute) | 5.5.0-1ubuntu0.1~esm1 | libtesseract5 5.5.0-1ubuntu0.1~esm1 | Sep 10, 2026 |
| mingw32-tesseract · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| mingw32-tesseract-debuginfo · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| mingw32-tesseract-tools · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| mingw64-tesseract · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| mingw64-tesseract-debuginfo · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| mingw64-tesseract-tools · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract-common · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract-debuginfo · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract-debugsource · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract-devel · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract-libs · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract-libs-debuginfo · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract-ocr · Ubuntu 18.04.6 LTS (bionic) | 4.00~git2288-10f4998a-2ubuntu0.1~esm1 | tesseract-ocr 4.00~git2288-10f4998a-2ubuntu0.1~esm1 | Oct 7, 2026 |
| tesseract-ocr · Ubuntu 20.04 LTS (focal) | 4.1.1-2ubuntu0.1~esm1 | tesseract-ocr 4.1.1-2ubuntu0.1~esm1 | Oct 7, 2026 |
| tesseract-ocr · Ubuntu 22.04.1 LTS (jammy) | 4.1.1-2.1ubuntu0.1~esm1 | tesseract-ocr 4.1.1-2.1ubuntu0.1~esm1 | Oct 7, 2026 |
| tesseract-ocr · Ubuntu 24.04.5 LTS (noble) | 5.3.4-1ubuntu0.1~esm1 | tesseract-ocr 5.3.4-1ubuntu0.1~esm1 | Oct 7, 2026 |
| tesseract-ocr · Ubuntu 26.04.1 LTS (resolute) | 5.5.0-1ubuntu0.1~esm1 | tesseract-ocr 5.5.0-1ubuntu0.1~esm1 | Sep 10, 2026 |
| tesseract-ocr · opensuse-leap 16.0 | 5.5.3-bp160.1.1 | OPENSUSE-SU-2026:21957-1 | Sep 24, 2026 |
| 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 | Oct 7, 2026 |
| tesseract-ocr-all · Ubuntu 20.04 LTS (focal) | 4.1.1-2ubuntu0.1~esm1 | tesseract-ocr-all 4.1.1-2ubuntu0.1~esm1 | Oct 7, 2026 |
| 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 | Oct 7, 2026 |
| tesseract-ocr-all · Ubuntu 24.04.5 LTS (noble) | 5.3.4-1ubuntu0.1~esm1 | tesseract-ocr-all 5.3.4-1ubuntu0.1~esm1 | Oct 7, 2026 |
| tesseract-ocr-all · Ubuntu 26.04.1 LTS (resolute) | 5.5.0-1ubuntu0.1~esm1 | tesseract-ocr-all 5.5.0-1ubuntu0.1~esm1 | Sep 10, 2026 |
| tesseract-tools · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
| tesseract-tools-debuginfo · Fedora 43 | 5.5.3-2.fc43 | FEDORA-2026-4585ABA520 | Sep 21, 2026 |
Patch Radar data is free to use with attribution. Terms and how to credit it.
Product names, logos and trademarks shown on Patch Radar belong to their respective owners. They are used only to identify the software each security fix applies to and to help readers find their platform. Their use does not imply any affiliation with, or endorsement by, those owners, and Patchblox is not affiliated with any of them.