{"id":"UBUNTU-CVE-2026-88049","details":"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.","modified":"2026-09-16T14:03:25.199157818Z","published":"2026-09-10T17:17:00Z","upstream":["CVE-2026-88049"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-88049"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-88049"}],"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_name":"libtesseract3","binary_version":"3.03.02-3"},{"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-2026-88049.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_version":"3.04.01-4","binary_name":"tesseract-ocr-all"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88049.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_version":"4.00~git2288-10f4998a-2","binary_name":"libtesseract4"},{"binary_name":"tesseract-ocr","binary_version":"4.00~git2288-10f4998a-2"},{"binary_version":"4.00~git2288-10f4998a-2","binary_name":"tesseract-ocr-all"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-88049.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_version":"4.1.1-2build2","binary_name":"libtesseract4"},{"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-2026-88049.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_name":"libtesseract4","binary_version":"4.1.1-2.1build1"},{"binary_name":"tesseract-ocr","binary_version":"4.1.1-2.1build1"},{"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-2026-88049.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-2026-88049.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_version":"5.5.0-1build1","binary_name":"libtesseract5"},{"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-2026-88049.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:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]}