{"id":"AZL-106728","summary":"CVE-2026-77214 affecting package expat 2.8.3-2","details":"libexpat before commit 13c5f63 contains a heap buffer over-read vulnerability in xmlparse.c. XML_ParseBuffer advances the parse buffer end with parser-\u003em_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.","modified":"2026-10-08T14:17:21.581124548Z","published":"2026-10-07T15:17:53Z","upstream":["CVE-2026-77214"],"references":[{"type":"WEB","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77214"}],"affected":[{"package":{"name":"expat","ecosystem":"Azure Linux:3","purl":"pkg:rpm/azure-linux/expat"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"last_affected":"2.8.3-2"}]}],"database_specific":{"source":"https://github.com/microsoft/AzureLinuxVulnerabilityData/blob/main/osv/AZL-106728.json"}}],"schema_version":"1.9.0"}