Bug 2531546 (CVE-2026-88048)

Summary: CVE-2026-88048 tesseract: Tesseract: Heap out-of-bounds write/read leading to information disclosure via crafted data
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: rhel-process-autobot, watson-tool-maintainers
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in Tesseract. The `FullyConnected::DeSerialize` function does not properly validate the dimensions of deserialized layers against the weight-matrix dimensions. This vulnerability allows a remote attacker to provide a specially crafted `.traineddata` file, leading to a heap out-of-bounds write and read during the `FullyConnected::Forward` operation. Successful exploitation can result in heap corruption, application crashes, or information disclosure.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Bug Depends On: 2531774    
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Description OSIDB Bzimport 2026-09-10 16:32:25 UTC 
Tesseract is an open source OCR engine. In version 5.5.3 and earlier, FullyConnected::DeSerialize in src/lstm/fullyconnected.cpp does not validate the deserialized layer scalars ni_ and no_ against the weight-matrix dimensions. During FullyConnected::Forward, MatrixDotVector in src/lstm/weightmatrix.cpp writes w.dim1() results into temp_line, which is sized from no_, and reads w.dim2() minus one inputs from curr_input, which is sized from ni_. A crafted .traineddata NT_SOFTMAX layer can therefore use inconsistent dimensions to cause a heap out-of-bounds write and read on the default LSTM engine, resulting in heap corruption, a crash, information disclosure, or potentially controlled corruption. No fixed release is available as of this review.