CVE-2026-88049 - Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch

CVE-2026-88049 - Tesseract: Heap out-of-bounds write in LSTM::Forward via na_/gate-matrix dimension mismatch

https://cvefeed.io/rssfeed/latest.atom / Thu, 09/10/2026 - 19:31
CVE ID :CVE-2026-88049
Published : Sept. 10, 2026, 4:23 p.m. | 43 minutes ago
Description :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.
Severity: 0.0 | NA
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