CVE-2026-88050: medium-severity vulnerability in tesseract-ocr tesseract
Tesseract: Out-of-bounds write in UnicharCompress via unvalidated recoder code values
Published
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13Vexday Risk Score
No sign of exploitation. No public exploitation artifact known so far.
ssvc Trackcvss 6.9epss 0.1%
Tesseract is an open source OCR engine. In version 5.5.3 and earlier, RecodedCharID::DeSerialize in src/ccutil/unicharcompress.h validates length_ but accepts negative code_ values from a crafted .traineddata recoder component. UnicharCompress::ComputeCodeRange in src/ccutil/unicharcompress.cpp can consequently produce code_range_ equal to zero, after which SetupDecoder indexes is_valid_start_ with the negative code on a size-zero vector. The resulting out-of-bounds bit write uses a large wrapped index and reliably causes a wild-address crash or allocation failure on the default LSTM engine. No fixed release is available as of this review.
CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
Affected products
tesseract-ocr · tesseractRelated CVEs — tesseract-ocr tesseract
In the same product, most dangerous first.
CVE-2026-119341NONETesseract: File-controlled pointers still reach `delete` in ADAPT_CLASS_STRUCT destructorEPSS 0.3%CVE-2026-88052HIGHTesseract: Heap out-of-bounds write in UNICHARSET::load_via_fgets via count/insert desynchronizationEPSS 0.2%CVE-2026-88053HIGHTesseract: Heap out-of-bounds write in Classify::ReadIntTemplates via unvalidated counts in crafted .traineddataEPSS 0.2%CVE-2026-88048HIGHTesseract: Heap out-of-bounds write/read in FullyConnected::Forward via layer/weight-matrix dimension mismatchEPSS 0.2%CVE-2026-88051HIGHTesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fieldsEPSS 0.2%CVE-2026-119339MEDIUMTesseract: Crafted LSTM model (`WeightMatrix` mode byte) triggers `ASSERT_HOST` abort in `WeightMatrix::DeSerializeOld` under `FAST_FLOAT` — Denial of ServiceEPSS 0.2%