CVE-2026-88054
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, Plumbing::DeSerialize in src/lstm/plumbing.cpp rejects excessively large network stacks but accepts a zero-length stack for NT_SERIES, NT_PARALLEL, or NT_REVERSED layers in a crafted .traineddata model. During LSTMRecognizer initialization in src/lstm/lstmrecognizer.cpp, CacheXScaleFactor(XScaleFactor()) reaches Series::CacheXScaleFactor in src/lstm/series.cpp, which dereferences stack_[0] on the empty vector and invokes a virtual method through an invalid Network pointer. This causes a deterministic crash and denial of service at model load. 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 |
Not affected
|
|
| 14.04 LTS trusty |
Not affected
|
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CVSS version:
Base score
6.9 · Medium
Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Base score
5.5 · Medium
Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
Related Ubuntu Security Notices (USN)
- USN-8882-1
- Tesseract vulnerabilities
- 6 October 2026