CVE-2026-88047
Publication date 10 September 2026
Last updated 6 October 2026
Ubuntu priority
Description
Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadNormProtos in src/classify/normmatch.cpp parses the NORMPROTO component of a .traineddata file and uses std::istream::operator>>(char*) to extract a whitespace-delimited token into a fixed 61-byte stack buffer without setting a stream width. The 100-byte line buffer can carry a token of up to 99 characters, so a token longer than 60 characters writes up to 39 attacker-controlled bytes past the buffer during TessBaseAPI::Init of the legacy engine, causing stack corruption, denial of service, and potentially control-flow hijacking on affected standard-library implementations. Builds using Apple's libc++ C++20 bounded array overload are incidentally protected, while typical libstdc++ builds remain affected. No fixed release is available as of this review.
Status
| Package | Ubuntu Release | Status |
|---|---|---|
| tesseract | 26.04 LTS resolute |
Fixed 5.5.0-1ubuntu0.1~esm1
|
| 24.04 LTS noble |
Fixed 5.3.4-1ubuntu0.1~esm1
|
|
| 22.04 LTS jammy |
Fixed 4.1.1-2.1ubuntu0.1~esm1
|
|
| 20.04 LTS focal |
Fixed 4.1.1-2ubuntu0.1~esm1
|
|
| 18.04 LTS bionic |
Fixed 4.00~git2288-10f4998a-2ubuntu0.1~esm1
|
|
| 16.04 LTS xenial |
Fixed 3.04.01-4ubuntu0.1~esm1
|
|
| 14.04 LTS trusty |
Fixed 3.03.02-3ubuntu0.1~esm1
|
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CVSS version:
Base score
8.6 · High
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N
Base score
7.8 · High
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8882-1
- Tesseract vulnerabilities
- 6 October 2026