{"id":"UBUNTU-CVE-2026-88047","details":"Tesseract is an open source OCR engine. In version 5.5.3 and earlier, Classify::ReadNormProtos in src/classify/normmatch.cpp parses the NORMPROTO component of a .traineddata file and uses std::istream::operator\u003e\u003e(char*) to extract a whitespace-delimited token into a fixed 61-byte stack buffer without setting a stream width. The 100-byte line buffer can carry a token of up to 99 characters, so a token longer than 60 characters writes up to 39 attacker-controlled bytes past the buffer during TessBaseAPI::Init of the legacy engine, causing stack corruption, denial of service, and potentially control-flow hijacking on affected standard-library implementations. Builds using Apple's libc++ C++20 bounded array overload are incidentally protected, while typical libstdc++ builds remain affected. No fixed release is available as of this review.","modified":"2026-09-16T14:03:25.393278714Z","published":"2026-09-10T17:17:00Z","upstream":["CVE-2026-88047"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-88047"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-88047"}],"affected":[{"package":{"name":"tesseract","ecosystem":"Ubuntu:14.04:LTS","purl":"pkg:deb/ubuntu/tesseract?arch=source&distro=trusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.02.02-1","3.03.02-3"],"ecosystem_specific":{"binaries":[{"binary_version":"3.03.02-3","binary_name":"libtesseract3"},{"binary_version":"3.03.02-3","binary_name":"tesseract-ocr"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88047.json"}},{"package":{"name":"tesseract","ecosystem":"Ubuntu:16.04:LTS","purl":"pkg:deb/ubuntu/tesseract?arch=source&distro=xenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.04.00-5ubuntu1","3.04.01-2","3.04.01-4"],"ecosystem_specific":{"binaries":[{"binary_name":"libtesseract3","binary_version":"3.04.01-4"},{"binary_version":"3.04.01-4","binary_name":"tesseract-ocr"},{"binary_name":"tesseract-ocr-all","binary_version":"3.04.01-4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88047.json"}},{"package":{"name":"tesseract","ecosystem":"Ubuntu:18.04:LTS","purl":"pkg:deb/ubuntu/tesseract?arch=source&distro=bionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["3.04.01-6","3.04.01-6build1","3.04.01-6build2","4.00~git2188-cdc35338-4build1","4.00~git2188-cdc35338-5","4.00~git2207-766b7bd6-3.1","4.00~git2219-40f43111-1.2","4.00~git2288-10f4998a-2"],"ecosystem_specific":{"binaries":[{"binary_name":"libtesseract4","binary_version":"4.00~git2288-10f4998a-2"},{"binary_name":"tesseract-ocr","binary_version":"4.00~git2288-10f4998a-2"},{"binary_name":"tesseract-ocr-all","binary_version":"4.00~git2288-10f4998a-2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88047.json"}},{"package":{"name":"tesseract","ecosystem":"Ubuntu:20.04:LTS","purl":"pkg:deb/ubuntu/tesseract?arch=source&distro=focal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.0-1","4.1.0-2","4.1.1-1","4.1.1-2","4.1.1-2build1","4.1.1-2build2"],"ecosystem_specific":{"binaries":[{"binary_name":"libtesseract4","binary_version":"4.1.1-2build2"},{"binary_name":"tesseract-ocr","binary_version":"4.1.1-2build2"},{"binary_name":"tesseract-ocr-all","binary_version":"4.1.1-2build2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88047.json"}},{"package":{"name":"tesseract","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/tesseract?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["4.1.1-2.1","4.1.1-2.1build1"],"ecosystem_specific":{"binaries":[{"binary_version":"4.1.1-2.1build1","binary_name":"libtesseract4"},{"binary_version":"4.1.1-2.1build1","binary_name":"tesseract-ocr"},{"binary_name":"tesseract-ocr-all","binary_version":"4.1.1-2.1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88047.json"}},{"package":{"name":"tesseract","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/tesseract?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.3.0-2build1","5.3.3-1","5.3.3-1build1","5.3.4-1","5.3.4-1build3","5.3.4-1build4","5.3.4-1build5"],"ecosystem_specific":{"binaries":[{"binary_name":"libtesseract5","binary_version":"5.3.4-1build5"},{"binary_name":"tesseract-ocr","binary_version":"5.3.4-1build5"},{"binary_name":"tesseract-ocr-all","binary_version":"5.3.4-1build5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88047.json"}},{"package":{"name":"tesseract","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/tesseract?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["5.5.0-1","5.5.0-1build1"],"ecosystem_specific":{"binaries":[{"binary_name":"libtesseract5","binary_version":"5.5.0-1build1"},{"binary_name":"tesseract-ocr","binary_version":"5.5.0-1build1"},{"binary_name":"tesseract-ocr-all","binary_version":"5.5.0-1build1"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88047.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"},{"type":"Ubuntu","score":"medium"}]}