Description
Tesseract is an open source OCR engine. From 5.4.0 until 5.5.4, AppendLinePolygon in src/api/pagerenderer.cpp destroys the caller-owned right-to-left Pta accumulator while receiving it by value, leaving line_top_rtl_pts and line_bottom_rtl_pts dangling. On an upright Hebrew or Arabic page at the default PAGE XML level, POLYGONFLAG with a false skewed_flag enters the vulnerable calls, while LEVELFLAG greater than zero provides an alternative gate. The calls repeatedly read and free the stale object, causing a double free and use after free and allowing corrupted coordinates to reach RecalcPolygonline. This issue is fixed in version 5.5.4.
References
- https://github.com/tesseract-ocr/tesseract/commit/fa52414ff1fd13ae4b00048d2498f9141b0bc2eb
- https://github.com/tesseract-ocr/tesseract/pull/4647
- https://github.com/tesseract-ocr/tesseract/releases/tag/5.5.4
- https://github.com/tesseract-ocr/tesseract/security/advisories/GHSA-vf7v-2h4f-6f4j
Collected automatically from public sources. Verify affected versions and fixes in the vendor's notice before acting.