{"id":"OESA-2026-4177","summary":"expat security update","details":"expat is a stream-oriented XML parser library written in C. expat excels with files too large to fit RAM, and where performance and flexibility are crucial.\r\n\r\nSecurity Fix(es):\n\nExpat through 2.8.4 fails to validate low surrogates following high surrogates in UTF-16 input, allowing malformed UTF-16 sequences to be accepted. Attackers can craft UTF-16 encoded XML with lone high surrogates that consume following code units, hiding markup characters from the parser and enabling XML injection attacks.(CVE-2026-93990)","modified":"2026-10-01T02:00:06.076550304Z","published":"2026-09-30T13:47:20Z","upstream":["CVE-2026-93990"],"database_specific":{"severity":"High"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4177"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-93990"}],"affected":[{"package":{"name":"expat","ecosystem":"openEuler:24.03-LTS-SP3","purl":"pkg:rpm/openEuler/expat&distro=openEuler-24.03-LTS-SP3"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.0-28.oe2403sp3"}]}],"ecosystem_specific":{"src":["expat-2.5.0-28.oe2403sp3.src.rpm"],"x86_64":["expat-2.5.0-28.oe2403sp3.x86_64.rpm","expat-debuginfo-2.5.0-28.oe2403sp3.x86_64.rpm","expat-debugsource-2.5.0-28.oe2403sp3.x86_64.rpm","expat-devel-2.5.0-28.oe2403sp3.x86_64.rpm"],"aarch64":["expat-2.5.0-28.oe2403sp3.aarch64.rpm","expat-debuginfo-2.5.0-28.oe2403sp3.aarch64.rpm","expat-debugsource-2.5.0-28.oe2403sp3.aarch64.rpm","expat-devel-2.5.0-28.oe2403sp3.aarch64.rpm"],"noarch":["expat-help-2.5.0-28.oe2403sp3.noarch.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4177.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}