What’s Vulnerable › Vulnerabilities

CVE-2026-88051: Tesseract: Heap out-of-bounds write in GenericVector<T>::read due to independent reserved/size_used_ fields

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.2% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-09-10 · updated 2026-09-16
• Weakness: CWE-787

Description

Tesseract is an open source OCR engine. In version 5.5.3 and earlier, the callback form of GenericVector::read in src/ccutil/genericvector.h reads the independent int32 fields reserved and size_used_ from a .traineddata model without a cap or an invariant check. reserve(reserved) allocates the backing array, but the callback loop writes size_used_ elements. A crafted TESSDATA_INTTEMP component with version_id 4 or later can therefore set reserved to a small value and size_used_ to a large value when fontinfo_table_.read(fp, read_info) is called from src/classify/intproto.cpp, causing a heap out-of-bounds write of FontInfo structures, heap corruption, a crash, or potentially controlled corruption. No fixed release is available as of this review.

Affected products

• tesseract-ocr tesseract: through 5.5.3

References

• https://github.com/tesseract-ocr/tesseract/commit/56e09ca12e751623fe796ce1554ce704bffd2ef0
• https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-88qp-4g94-3rf3
• https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-88qp-4g94-3rf3

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