{"id":"USN-8790-1","summary":"expat vulnerabilities","details":"It was discovered that Expat could be made to allocate large amounts of\nmemory when parsing a small crafted document. An attacker could possibly\nuse this issue to cause Expat to consume resources, leading to a denial of\nservice. This issue was only addressed in Ubuntu 24.04 LTS.\n(CVE-2025-59375)\n\nIt was discovered that Expat incorrectly handled empty external parameter\nentity content. An attacker could possibly use this issue to cause Expat to\ncrash, resulting in a denial of service. (CVE-2026-32776)\n\nIt was discovered that Expat incorrectly handled certain DTD content. An\nattacker could possibly use this issue to cause Expat to enter an infinite\nloop, resulting in a denial of service. (CVE-2026-32777)\n\nIt was discovered that Expat incorrectly handled memory when retrying after\nan earlier out-of-memory condition. An attacker could possibly use this\nissue to cause Expat to crash, resulting in a denial of service.\n(CVE-2026-32778)\n\nIt was discovered that Expat performed attribute name collision checks\ninefficiently. An attacker could possibly use this issue to cause Expat to\nconsume resources when processing a moderately sized crafted XML document,\nresulting in a denial of service.  This issue was only addressed in Ubuntu\n24.04 LTS and Ubuntu 26.04 LTS. (CVE-2026-45186)\n\nIt was discovered that Expat used insufficient entropy, allowing hash\nflooding through a crafted XML document. An attacker could possibly use\nthis issue to cause Expat to consume resources, leading to a denial of\nservice.  This issue was only addressed in Ubuntu 14.04 LTS, Ubuntu 24.04\nLTS, and Ubuntu 26.04 LTS. (CVE-2026-41080)\n\nIt was discovered that Expat did not track handler call depth for certain\nfunctions called from within handlers, leading to a use-after-free. An\nattacker could possibly use this issue to cause Expat to crash, resulting\nin a denial of service, or possibly execute arbitrary code.\n(CVE-2026-50219, CVE-2026-56412)\n\nIt was discovered that Expat incorrectly handled certain values, leading to\ninteger overflows. An attacker could possibly use this issue to cause Expat\nto crash, resulting in a denial of service. (CVE-2026-56403,\nCVE-2026-56404, CVE-2026-56405)\n\nIt was discovered that Expat incorrectly handled certain values, leading to\nan integer overflow. An attacker could possibly use this issue to cause\nExpat to crash, resulting in a denial of service. This issue only affected\nUbuntu 18.04 LTS, Ubuntu 20.04 LTS, Ubuntu 22.04 LTS, Ubuntu 24.04 LTS, and\nUbuntu 26.04 LTS. (CVE-2026-56408)","modified":"2026-09-22T03:27:36.575298644Z","published":"2026-09-21T13:50:42Z","related":["UBUNTU-CVE-2025-59375","UBUNTU-CVE-2026-32776","UBUNTU-CVE-2026-32777","UBUNTU-CVE-2026-32778","UBUNTU-CVE-2026-41080","UBUNTU-CVE-2026-45186","UBUNTU-CVE-2026-50219","UBUNTU-CVE-2026-56403","UBUNTU-CVE-2026-56404","UBUNTU-CVE-2026-56405","UBUNTU-CVE-2026-56408","UBUNTU-CVE-2026-56412"],"upstream":["CVE-2025-59375","CVE-2026-32776","CVE-2026-32777","CVE-2026-32778","CVE-2026-41080","CVE-2026-45186","CVE-2026-50219","CVE-2026-56403","CVE-2026-56404","CVE-2026-56405","CVE-2026-56408","CVE-2026-56412","UBUNTU-CVE-2025-59375","UBUNTU-CVE-2026-32776","UBUNTU-CVE-2026-32777","UBUNTU-CVE-2026-32778","UBUNTU-CVE-2026-41080","UBUNTU-CVE-2026-45186","UBUNTU-CVE-2026-50219","UBUNTU-CVE-2026-56403","UBUNTU-CVE-2026-56404","UBUNTU-CVE-2026-56405","UBUNTU-CVE-2026-56408","UBUNTU-CVE-2026-56412"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8790-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2025-59375"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32776"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32777"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-32778"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-41080"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-45186"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-50219"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56403"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56404"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56405"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56408"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56412"}],"affected":[{"package":{"name":"expat","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/expat?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-4ubuntu1.4+esm12"}]}],"versions":["2.1.0-4","2.1.0-4ubuntu1","2.1.0-4ubuntu1.1","2.1.0-4ubuntu1.2","2.1.0-4ubuntu1.3","2.1.0-4ubuntu1.4","2.1.0-4ubuntu1.4+esm1","2.1.0-4ubuntu1.4+esm2","2.1.0-4ubuntu1.4+esm4","2.1.0-4ubuntu1.4+esm6","2.1.0-4ubuntu1.4+esm7","2.1.0-4ubuntu1.4+esm8","2.1.0-4ubuntu1.4+esm9","2.1.0-4ubuntu1.4+esm10","2.1.0-4ubuntu1.4+esm11"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"expat","binary_version":"2.1.0-4ubuntu1.4+esm12"},{"binary_name":"lib64expat1","binary_version":"2.1.0-4ubuntu1.4+esm12"},{"binary_name":"libexpat1","binary_version":"2.1.0-4ubuntu1.4+esm12"}]},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-32776"},{"id":"CVE-2026-32777","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-32778","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"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"}]},{"id":"CVE-2026-41080","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-50219"},{"id":"CVE-2026-56403","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-56404"},{"id":"CVE-2026-56405","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-56412","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8790-1.json"}},{"package":{"name":"expat","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/expat?arch=source&distro=esm-infra-legacy%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.1.0-7ubuntu0.16.04.5+esm13"}]}],"versions":["2.1.0-7","2.1.0-7ubuntu0.16.04.1","2.1.0-7ubuntu0.16.04.2","2.1.0-7ubuntu0.16.04.3","2.1.0-7ubuntu0.16.04.4","2.1.0-7ubuntu0.16.04.5","2.1.0-7ubuntu0.16.04.5+esm2","2.1.0-7ubuntu0.16.04.5+esm5","2.1.0-7ubuntu0.16.04.5+esm6","2.1.0-7ubuntu0.16.04.5+esm7","2.1.0-7ubuntu0.16.04.5+esm8","2.1.0-7ubuntu0.16.04.5+esm9","2.1.0-7ubuntu0.16.04.5+esm10","2.1.0-7ubuntu0.16.04.5+esm11","2.1.0-7ubuntu0.16.04.5+esm12"],"ecosystem_specific":{"binaries":[{"binary_name":"expat","binary_version":"2.1.0-7ubuntu0.16.04.5+esm13"},{"binary_name":"lib64expat1","binary_version":"2.1.0-7ubuntu0.16.04.5+esm13"},{"binary_name":"libexpat1","binary_version":"2.1.0-7ubuntu0.16.04.5+esm13"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8790-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"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"}],"id":"CVE-2026-32776"},{"id":"CVE-2026-32777","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"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"}]},{"id":"CVE-2026-32778","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-50219","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-56403","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-56404"},{"id":"CVE-2026-56405","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-56412"}]}}},{"package":{"name":"expat","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/expat?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.5-3ubuntu0.9+esm4"}]}],"versions":["2.2.3-1","2.2.3-2","2.2.5-0ubuntu2","2.2.5-3","2.2.5-3ubuntu0.1","2.2.5-3ubuntu0.2","2.2.5-3ubuntu0.4","2.2.5-3ubuntu0.7","2.2.5-3ubuntu0.8","2.2.5-3ubuntu0.9","2.2.5-3ubuntu0.9+esm1","2.2.5-3ubuntu0.9+esm2","2.2.5-3ubuntu0.9+esm3"],"ecosystem_specific":{"binaries":[{"binary_version":"2.2.5-3ubuntu0.9+esm4","binary_name":"expat"},{"binary_name":"libexpat1","binary_version":"2.2.5-3ubuntu0.9+esm4"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"id":"CVE-2026-32776","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-32777","severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","type":"CVSS_V3"},{"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"}]},{"id":"CVE-2026-32778","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:L"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-50219","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-56403"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L"},{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-56404"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-56405"},{"id":"CVE-2026-56408","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:H/I:H/A:L","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-56412","severity":[{"score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:L/A:L","type":"CVSS_V3"},{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8790-1.json"}},{"package":{"name":"expat","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/expat?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.2.9-1ubuntu0.8+esm2"}]}],"versions":["2.2.7-2","2.2.9-1","2.2.9-1build1","2.2.9-1ubuntu0.2","2.2.9-1ubuntu0.4","2.2.9-1ubuntu0.5","2.2.9-1ubuntu0.6","2.2.9-1ubuntu0.7","2.2.9-1ubuntu0.8","2.2.9-1ubuntu0.8+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): 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