{"id":"OESA-2026-4349","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\nlibexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser->m_bufferEnd += len using a caller-supplied length that is not validated against the allocated buffer size, so repeated XML_ParseBuffer calls move m_bufferEnd past the end of the heap allocation and subsequent parsing reads out of bounds. Reaching this path requires a parse buffer to already be present; otherwise XML_ParseBuffer returns XML_ERROR_NO_BUFFER. A buffer is present after a prior call to XML_GetBuffer, either directly (the common case) or indirectly through a prior XML_Parse call that allocates the buffer internally. The over-read discloses adjacent heap memory to the calling application, recovering heap pointers, libc function pointers, and code pointers sufficient to defeat ASLR and build further exploitation primitives.(CVE-2026-77214)","modified":"2026-10-16T12:15:19.070214532Z","published":"2026-10-16T11:59:38Z","upstream":["CVE-2026-77214"],"database_specific":{"severity":"High"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4349"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77214"}],"affected":[{"package":{"name":"expat","ecosystem":"openEuler:24.03-LTS-SP1","purl":"pkg:rpm/openEuler/expat&distro=openEuler-24.03-LTS-SP1"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.5.0-29.oe2403sp1"}]}],"ecosystem_specific":{"aarch64":["expat-2.5.0-29.oe2403sp1.aarch64.rpm","expat-debuginfo-2.5.0-29.oe2403sp1.aarch64.rpm","expat-debugsource-2.5.0-29.oe2403sp1.aarch64.rpm","expat-devel-2.5.0-29.oe2403sp1.aarch64.rpm"],"noarch":["expat-help-2.5.0-29.oe2403sp1.noarch.rpm"],"src":["expat-2.5.0-29.oe2403sp1.src.rpm"],"x86_64":["expat-2.5.0-29.oe2403sp1.x86_64.rpm","expat-debuginfo-2.5.0-29.oe2403sp1.x86_64.rpm","expat-debugsource-2.5.0-29.oe2403sp1.x86_64.rpm","expat-devel-2.5.0-29.oe2403sp1.x86_64.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4349.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L"}]}