CVE-2026-88053
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::ReadIntTemplates in src/classify/intproto.cpp reads NumClassPruners, NumClasses, and NumProtoSets from the TESSDATA_INTTEMP component of a crafted .traineddata file and uses those values as loop bounds without validating them against MAX_NUM_CLASS_PRUNERS, MAX_NUM_CLASSES, and MAX_NUM_PROTO_SETS. The loops store heap pointers into fixed-capacity ClassPruners and ProtoSets arrays in INT_TEMPLATES_STRUCT and INT_CLASS_STRUCT, so an oversized count causes heap out-of-bounds pointer writes during legacy-classifier initialization before OCR begins, resulting in heap corruption, a crash, or potentially controlled corruption. 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 | Ignored changes too intrusive | |
| 14.04 LTS trusty | Ignored changes too intrusive |
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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