Description
Tesseract is an open source OCR engine. Prior to 5.5.4, ReadAdaptedClass in src/classify/adaptive.cpp raw-reads an ADAPT_CLASS_STRUCT from a pre-adapted-template .a file without neutralizing TempProtos and Config pointer fields before any destructor path. When the legacy engine is selected, classify_use_pre_adapted_templates is enabled, and an attacker can write the output-basename .a file, the success or rejection path can pass file-controlled pointers to ~ADAPT_CLASS_STRUCT and operator delete, causing memory corruption and denial of service. This issue is fixed in version 5.5.4.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| tesseract-ocr | tesseract | < 5.5.3 | — |
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | tesseract | No fix yet | — |
| Debian 13 | tesseract | No fix yet | — |
| Debian 12 | tesseract | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | tesseract | No fix yet | — |
Show 7 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 26.04 LTS | tesseract | No fix yet | — |
| Ubuntu Pro 24.04 LTS | tesseract | No fix yet | — |
| Ubuntu Pro 22.04 LTS | tesseract | No fix yet | — |
| Ubuntu Pro 20.04 LTS | tesseract | No fix yet | — |
| Ubuntu Pro 18.04 LTS | tesseract | No fix yet | — |
| Ubuntu Pro 16.04 LTS | tesseract | No fix yet | — |
| Ubuntu Pro 14.04 LTS | tesseract | No fix yet | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | tesseract-ocr | 5.5.4-2.1 | openSUSE-SU-2026:12411-1 |
Advisories 1
- openSUSE-SU-2026:12411-1 libtesseract5-5.5.4-2.1 on GA media SUSE / openSUSE Security Updates · Nov 4, 2026