CVE-2026-88052
Published: September 10th, 2026
Tesseract is an open source OCR engine. In version 5.5.3 and earlier, UNICHARSET::load_via_fgets in src/ccutil/unicharset.cpp trusts the declared unichar count as a loop bound and uses id as an unchecked index into the unichars vector. unichar_insert_backwards_compatible can leave the vector unchanged for an empty, duplicate, or already-encodable representation, causing id to become larger than unichars.size(). Subsequent set_* calls and the write to unichars[id].properties.enabled then write UNICHAR_PROPERTIES beyond the vector during initialization in both the default LSTM and legacy engines, causing heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.
HIGH
CVSS v3: 7.8
CVSS v3: 7.8
Status
| DocFilters Release | Package | State | Justification | Comment |
|---|---|---|---|---|
| daily | tesseract (3.02.02) | Needs Triage | ||
| 26.3 | tesseract (3.02.02) | Needs Triage | ||
| 26.2 | tesseract (3.02.02) | Needs Triage | ||
| 26.1 | tesseract (3.02.02) | Needs Triage | ||
| 25.4 | tesseract (3.02.02) | Needs Triage | ||
| 25.3 | tesseract (3.02.02) | Needs Triage | ||
| 25.2 | tesseract (3.02.02) | Needs Triage | ||
| 25.1 | tesseract (3.02.02) | Needs Triage | ||
| 24.4 | tesseract (3.02.02) | Needs Triage | ||
| 24.4.0 | tesseract (3.02.02) | Needs Triage | ||
| 24.3 | tesseract (3.02.02) | Needs Triage | ||
| 24.2 | tesseract (3.02.02) | Needs Triage | ||
| 24.1 | tesseract (3.02.02) | Needs Triage | ||
| 23.3 | tesseract (3.02.02) | Needs Triage | ||
| 23.2 | tesseract (3.02.02) | Needs Triage | ||
| 23.1 | tesseract (3.02.02) | Needs Triage | ||
| 22.4 | tesseract (3.02.02) | Needs Triage | ||
| 22.3 | tesseract (3.02.02) | Needs Triage | ||
| 22.2 | tesseract (3.02.02) | Needs Triage | ||
| 22.1 | tesseract (3.02.02) | Needs Triage | ||
| 21.11 | tesseract (3.02.02) | Needs Triage | ||
| 21.8 | tesseract (3.02.02) | Needs Triage | ||
| 21.5.0 | tesseract (3.02.02) | Needs Triage | ||
| 21.2.0 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.19.3667 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.18.3599 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.16.3445 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.15.3368 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.14.3263 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.13.3179 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.12.3054 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.11.3040 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.11.2990 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.10.2934 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.9.2878 | tesseract (3.02.02) | Needs Triage | ||
| 11.4.8.2822 | tesseract (3.02.02) | Needs Triage |
Severity score breakdown
Attack Complexity
LOW
Attack Vector
LOCAL
Availability Impact
HIGH
Base Score
7.8
Base Severity
HIGH
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Privileges Required
NONE
Scope
UNCHANGED
User Interaction
REQUIRED
Vector String
CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H
Version
3.1