{"schemaVersion":3,"id":"CVE-2026-77214","aliases":["RHSA-2026:77959","UBUNTU-CVE-2026-77214","DEBIAN-CVE-2026-77214","openSUSE-SU-2026:12100-1","ALPINE-CVE-2026-77214"],"status":"published","duplicateOf":null,"title":null,"description":"libexpat 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.","dates":{"published":"2026-10-07T14:35:42.794Z","modified":"2026-10-10T02:26:09.470Z","reserved":null,"kevAdded":[],"kevDue":[]},"cvss":{"headline":{"score":8.3,"severity":"high","version":"4.0","versionLabel":"v4.0","source":"CVE.org","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N","computed":false,"selection":"backend-summary"},"metrics":[{"version":"4.0","versionLabel":"v4.0","source":"CVE.org","score":8.3,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"CVE.org","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Red hat","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L","exploitability":10,"impact":7,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Ubuntu","score":8.3,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/SC:N/SI:N/SA:N","exploitability":null,"impact":null,"computed":true},{"version":"3.1","versionLabel":"v3.1","source":"OSV · Ubuntu","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L","exploitability":10,"impact":7,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Debian","score":8.3,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/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","exploitability":null,"impact":null,"computed":true},{"version":"4.0","versionLabel":"v4.0","source":"NVD","score":8.3,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/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","exploitability":null,"impact":null,"computed":false},{"version":"3.1","versionLabel":"v3.1","source":"NVD","score":8.2,"severity":"high","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:L","exploitability":null,"impact":null,"computed":false},{"version":"4.0","versionLabel":"v4.0","source":"OSV · Alpine","score":8.3,"severity":"high","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:H/VI:N/VA:L/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","exploitability":null,"impact":null,"computed":true}]},"epss":{"probability":0.00549,"percentile":0.44829,"severity":"low","asOf":"2026-10-19T00:00:00.000Z","change":{"pp":null,"baselineDate":null,"baselineScore":null},"history":[{"date":"2026-10-08T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00549,"percentile":0.44829}],"last30":[{"date":"2026-10-08T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-09T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-10T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-11T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-12T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-13T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-14T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-15T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-16T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-17T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-18T00:00:00.000Z","score":0.00549,"percentile":null},{"date":"2026-10-19T00:00:00.000Z","score":0.00549,"percentile":0.44829}]},"kev":{"state":"not-listed","entries":[],"listedCount":0,"totalCatalogs":3,"catalogs":[{"source":"cisa","label":"CISA","listed":false,"entry":null},{"source":"enisa","label":"ENISA","listed":false,"entry":null},{"source":"circl","label":"CIRCL","listed":false,"entry":null}]},"ransomware":{"state":"none-recorded","sources":[]},"exploits":[],"exploitCount":0,"weaknesses":[{"id":"CWE-125","name":"Out-of-bounds Read","description":"The product reads data past the end, or before the beginning, of the intended buffer.","type":"weakness","status":"Draft","abstraction":"Base","likelihoodOfExploit":null,"url":"https://cwe.mitre.org/data/definitions/125.html"}],"affected":[{"vendor":"alpine","product":"expat","name":"expat","label":"expat","ecosystem":"Alpine Linux","cpePart":null,"purl":"pkg:apk/alpine/expat","purlType":"apk","versions":[{"text":"< 2.9.0-r0","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.9.0-r0","eol":null,"hubHref":null},{"vendor":"debian","product":"expat","name":"expat","label":"expat","ecosystem":"Debian","cpePart":null,"purl":"pkg:deb/debian/expat","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null},{"text":"< 2.9.0-1~deb13u1","noFixRecorded":false,"fixedIn":null},{"text":"< 2.9.0-1","noFixRecorded":false,"fixedIn":null}],"versionsText":"All versions (No fix recorded) | < 2.9.0-1~deb13u1 | < 2.9.0-1","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"ayttm","name":"ayttm","label":"ayttm","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/ayttm","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"cableswig","name":"cableswig","label":"cableswig","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/cableswig","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"cadaver","name":"cadaver","label":"cadaver","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/cadaver","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"coin3","name":"coin3","label":"coin3","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/coin3","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"expat","name":"expat","label":"expat","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/expat","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"gdcm","name":"gdcm","label":"gdcm","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/gdcm","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"insighttoolkit4","name":"insighttoolkit4","label":"insighttoolkit4","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/insighttoolkit4","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"libxmltok","name":"libxmltok","label":"libxmltok","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/libxmltok","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"matanza","name":"matanza","label":"matanza","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/matanza","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"smart","name":"smart","label":"smart","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/smart","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"swish-e","name":"swish-e","label":"swish-e","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/swish-e","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"tdom","name":"tdom","label":"tdom","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/tdom","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"vnc4","name":"vnc4","label":"vnc4","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/vnc4","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"vtk","name":"vtk","label":"vtk","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/vtk","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"wbxml2","name":"wbxml2","label":"wbxml2","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/wbxml2","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"ubuntu","product":"xmlrpc-c","name":"xmlrpc-c","label":"xmlrpc-c","ecosystem":"Ubuntu","cpePart":null,"purl":"pkg:deb/ubuntu/xmlrpc-c","purlType":"deb","versions":[{"text":"All versions","noFixRecorded":true,"fixedIn":null}],"versionsText":"All versions (No fix recorded)","eol":null,"hubHref":null},{"vendor":"libexpat","product":"libexpat","name":"libexpat","label":"libexpat","ecosystem":null,"cpePart":"a","purl":null,"purlType":null,"versions":[{"text":"≤ 2.8.5","noFixRecorded":false,"fixedIn":null}],"versionsText":"≤ 2.8.5","eol":null,"hubHref":"/vendor/libexpat/libexpat"},{"vendor":"opensuse","product":"expat&distro=openSUSE Tumbleweed","name":"expat","label":"expat&distro=openSUSE Tumbleweed","ecosystem":"openSUSE","cpePart":null,"purl":"pkg:rpm/opensuse/expat&distro=openSUSE Tumbleweed","purlType":"rpm","versions":[{"text":"< 2.9.0-1.1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 2.9.0-1.1","eol":null,"hubHref":null},{"vendor":"redhat","product":"expat","name":"expat","label":"expat","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/expat","purlType":"rpm","versions":[{"text":"< 0:2.8.5-1.2.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:2.8.5-1.2.hum1","eol":null,"hubHref":null},{"vendor":"redhat","product":"expat-devel","name":"expat-devel","label":"expat-devel","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/expat-devel","purlType":"rpm","versions":[{"text":"< 0:2.8.5-1.2.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:2.8.5-1.2.hum1","eol":null,"hubHref":null},{"vendor":"redhat","product":"expat-static","name":"expat-static","label":"expat-static","ecosystem":"Red Hat","cpePart":null,"purl":"pkg:rpm/redhat/expat-static","purlType":"rpm","versions":[{"text":"< 0:2.8.5-1.2.hum1","noFixRecorded":false,"fixedIn":null}],"versionsText":"< 0:2.8.5-1.2.hum1","eol":null,"hubHref":null}],"affectedCount":23,"eol":{"hasEol":false,"count":0},"references":[{"url":"https://github.com/libexpat/libexpat/pull/1393","label":"github.com/libexpat/libexpat/pull/1393","hostname":"github.com","tags":["Issue Tracking","ARTICLE","REPORT"]},{"url":"https://github.com/libexpat/libexpat/commit/13c5f63a7f1c52c2feee3b16a1134d4fb68e9ea0","label":"github.com/libexpat/libexpat/commit/13c5f63a7f1c52c2feee3b16a1134d4fb68e9ea0","hostname":"github.com","tags":["Patch","ARTICLE"]},{"url":"https://www.vulncheck.com/advisories/libexpat-heap-buffer-over-read-in-xmlparse-c-via-xml-parsebuffer","label":"www.vulncheck.com/advisories/libexpat-heap-buffer-over-read-in-xmlparse-c-via-xml-parsebuffer","hostname":"www.vulncheck.com","tags":["Third Party Advisory","ARTICLE"]},{"url":"https://access.redhat.com/errata/RHSA-2026:77959","label":"access.redhat.com/errata/RHSA-2026:77959","hostname":"access.redhat.com","tags":["Advisory"]},{"url":"https://access.redhat.com/security/cve/CVE-2026-77214","label":"access.redhat.com/security/cve/CVE-2026-77214","hostname":"access.redhat.com","tags":["REPORT"]},{"url":"https://access.redhat.com/security/updates/classification/","label":"access.redhat.com/security/updates/classification/","hostname":"access.redhat.com","tags":["ARTICLE"]},{"url":"https://images.redhat.com/","label":"images.redhat.com","hostname":"images.redhat.com","tags":["ARTICLE"]},{"url":"https://security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_77959.json","label":"security.access.redhat.com/data/csaf/v2/advisories/2026/rhsa-2026_77959.json","hostname":"security.access.redhat.com","tags":["Advisory"]},{"url":"https://bugzilla.redhat.com/show_bug.cgi?id=2547476","label":"bugzilla.redhat.com/show_bug.cgi?id=2547476","hostname":"bugzilla.redhat.com","tags":["REPORT"]},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-77214","label":"www.cve.org/CVERecord?id=CVE-2026-77214","hostname":"www.cve.org","tags":["Advisory","REPORT"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-77214","label":"nvd.nist.gov/vuln/detail/CVE-2026-77214","hostname":"nvd.nist.gov","tags":["Advisory"]},{"url":"https://ubuntu.com/security/CVE-2026-77214","label":"ubuntu.com/security/CVE-2026-77214","hostname":"ubuntu.com","tags":["REPORT"]},{"url":"https://security-tracker.debian.org/tracker/CVE-2026-77214","label":"security-tracker.debian.org/tracker/CVE-2026-77214","hostname":"security-tracker.debian.org","tags":["Advisory"]},{"url":"https://www.suse.com/security/cve/CVE-2026-77214","label":"www.suse.com/security/cve/CVE-2026-77214","hostname":"www.suse.com","tags":["WEB"]},{"url":"https://security.alpinelinux.org/vuln/CVE-2026-77214","label":"security.alpinelinux.org/vuln/CVE-2026-77214","hostname":"security.alpinelinux.org","tags":["Advisory"]}],"lineage":{"upstream":[],"downstream":["SUSE-SU-2026:4615-1","SUSE-SU-2026:4619-1","SUSE-SU-2026:4623-1"],"duplicates":[],"related":["SUSE-SU-2026:4615-1","SUSE-SU-2026:4619-1","SUSE-SU-2026:4623-1"]},"timeline":[{"kind":"published","date":"2026-10-07T14:35:42.794Z","label":"Published","detail":"Vulnerability first disclosed.","source":null},{"kind":"modified","date":"2026-10-10T02:26:09.470Z","label":"Last modified","detail":"Vulnerability information updated.","source":null}],"risk":{"score":33,"level":"medium","profile":"Default","thresholds":{"critical":75,"high":50,"medium":25,"low":10}},"meta":{"dataAsOf":"2026-10-20T08:14:53.445Z","stale":false,"partial":false}}