CVE-2026-88049

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, prior .traineddata hardening added bounds checks to NetworkIO::CopyTimeStepGeneral and NetworkIO::Randomize in src/lstm/networkio.cpp but left NetworkIO::WriteTimeStepPart and NetworkIO::AddTimeStepPart unchecked. In LSTM::Forward in src/lstm/lstm.cpp, source_ is sized from the independently deserialized na_ field while the WriteTimeStepPart count is ns_, which comes from the CI gate WeightMatrix dim1() value. A crafted NT_LSTM layer can make ns_ much larger than na_, causing a heap out-of-bounds write during the first recognition step on the default LSTM engine and resulting in heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.

CVSS v3 5.5 MEDIUM

5.5^/10

CVSS v3 : MEDIUM

Vector :

Exploitability : 1.8 / Impact : 3.6

Attack Vector LOCAL

Attack Complexity LOW

Privileges Required LOW

User Interaction NONE

Confidentiality Impact NONE

Integrity Impact NONE

Availability Impact HIGH

Scope UNCHANGED

References

Link	Resource
https://github.com/tesseract-ocr/tesseract/commit/b494ac18925f9d9aff9ef5815475de9943ab19bf	Patch
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-jgq8-pprg-vc68	Vendor Advisory
https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-jgq8-pprg-vc68	Vendor Advisory

Configurations

Configuration 1 (hide)

cpe:2.3:a:tesseract-ocr:tesseract_ocr:*:*:*:*:*:*:*:*

History

No history.

Information

Published : 2026-09-10 17:17

Updated : 2026-09-14 20:01

NVD link : CVE-2026-88049

Mitre link : CVE-2026-88049

CVE.ORG link : CVE-2026-88049

JSON object : View

Products Affected

tesseract-ocr

tesseract_ocr

CWE

CWE-787

Out-of-bounds Write

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