{"id":"USN-8813-1","summary":"expat vulnerabilities","details":"It was discovered that Expat did not correctly handle certain integer\narithmetic. An attacker could possibly use this issue to cause a denial of\nservice. \n(CVE-2026-56406, CVE-2026-56407, CVE-2026-56409, CVE-2026-56410, CVE-2026-56411)\n\nIt was discovered that Expat did not correctly track handler call depth. An\nattacker could possibly use this issue to cause Expat to crash or execute\narbitrary code. (CVE-2026-56131)\n\nIt was discovered that Expat did not correctly handle certain memory\noperations. An attacker could possibly use this issue to cause Expat to\ncrash or execute arbitrary code. (CVE-2026-56132)\n\nIt was discovered that Expat did not correctly handle certain Unicode\ncharacters. An attacker could possibly use this issue to cause Expat to use\nexcessive resources, leading to a denial of service. (CVE-2026-72522)\n\nIt was discovered that Expat did not correctly process certain XML\nattributes. A remote attacker could possibly use this issue to cause Expat\nto use excessive resources, leading to a denial of service.\n(CVE-2026-66046)\n\nIt was discovered that Expat did not correctly handle certain external\nentities. An attacker could possibly use this issue to cause Expat to crash\nor execute arbitrary code. (CVE-2026-76641)\n\nIt was discovered that Expat did not correctly track handler call depth\nwith custom encodings. An attacker could possibly use this issue to cause\nExpat to crash or execute arbitrary code. (CVE-2026-76957)","modified":"2026-09-25T00:43:11.198618689Z","published":"2026-09-24T12:45:19Z","related":["UBUNTU-CVE-2026-56131","UBUNTU-CVE-2026-56132","UBUNTU-CVE-2026-56406","UBUNTU-CVE-2026-56407","UBUNTU-CVE-2026-56409","UBUNTU-CVE-2026-56410","UBUNTU-CVE-2026-56411","UBUNTU-CVE-2026-66046","UBUNTU-CVE-2026-72522","UBUNTU-CVE-2026-76641","UBUNTU-CVE-2026-76957"],"upstream":["CVE-2026-56131","CVE-2026-56132","CVE-2026-56406","CVE-2026-56407","CVE-2026-56409","CVE-2026-56410","CVE-2026-56411","CVE-2026-66046","CVE-2026-72522","CVE-2026-76641","CVE-2026-76957","UBUNTU-CVE-2026-56131","UBUNTU-CVE-2026-56132","UBUNTU-CVE-2026-56406","UBUNTU-CVE-2026-56407","UBUNTU-CVE-2026-56409","UBUNTU-CVE-2026-56410","UBUNTU-CVE-2026-56411","UBUNTU-CVE-2026-66046","UBUNTU-CVE-2026-72522","UBUNTU-CVE-2026-76641","UBUNTU-CVE-2026-76957"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8813-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56131"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56132"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56406"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56407"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56409"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56410"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-56411"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-66046"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-72522"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-76641"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-76957"}],"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+esm13"}]}],"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","2.1.0-4ubuntu1.4+esm12"],"ecosystem_specific":{"binaries":[{"binary_name":"expat","binary_version":"2.1.0-4ubuntu1.4+esm13"},{"binary_name":"lib64expat1","binary_version":"2.1.0-4ubuntu1.4+esm13"},{"binary_version":"2.1.0-4ubuntu1.4+esm13","binary_name":"libexpat1"}],"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-8813-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"id":"CVE-2026-56131","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":"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-2026-56132"},{"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":"medium","type":"Ubuntu"}],"id":"CVE-2026-56406"},{"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-2026-56407"},{"id":"CVE-2026-56409","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-56410","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"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-66046"},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-72522"},{"id":"CVE-2026-76641","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-76957","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:L/UI:N/S:U/C:H/I:H/A:H"},{"score":"medium","type":"Ubuntu"}]}]}}},{"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+esm14"}]}],"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","2.1.0-7ubuntu0.16.04.5+esm13"],"ecosystem_specific":{"binaries":[{"binary_name":"expat","binary_version":"2.1.0-7ubuntu0.16.04.5+esm14"},{"binary_name":"lib64expat1","binary_version":"2.1.0-7ubuntu0.16.04.5+esm14"},{"binary_version":"2.1.0-7ubuntu0.16.04.5+esm14","binary_name":"libexpat1"}],"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro"},"database_specific":{"cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"id":"CVE-2026-56131","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":"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"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-56132"},{"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":"Ubuntu","score":"medium"}],"id":"CVE-2026-56406"},{"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-2026-56407"},{"id":"CVE-2026-56409","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-56410","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":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-66046","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"type":"Ubuntu","score":"medium"}]},{"severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-72522"},{"id":"CVE-2026-76641","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"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"},{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}],"id":"CVE-2026-76957"}]},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8813-1.json"}},{"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+esm5"}]}],"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","2.2.5-3ubuntu0.9+esm4"],"ecosystem_specific":{"binaries":[{"binary_name":"expat","binary_version":"2.2.5-3ubuntu0.9+esm5"},{"binary_name":"libexpat1","binary_version":"2.2.5-3ubuntu0.9+esm5"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"cves_map":{"cves":[{"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":"Ubuntu","score":"medium"}],"id":"CVE-2026-56131"},{"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-2026-56132"},{"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":"Ubuntu","score":"medium"}],"id":"CVE-2026-56406"},{"id":"CVE-2026-56407","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":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-56409","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:L"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-56410","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":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-56411","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":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-66046","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-72522","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"type":"Ubuntu","score":"medium"}]},{"id":"CVE-2026-76641","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"score":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","type":"CVSS_V4"},{"score":"medium","type":"Ubuntu"}]},{"id":"CVE-2026-76957","severity":[{"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:L/UI:N/S:U/C:H/I:H/A:H","type":"CVSS_V3"},{"type":"Ubuntu","score":"medium"}]}],"ecosystem":"Ubuntu:Pro:18.04:LTS"},"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8813-1.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+esm3"}]}],"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","2.2.9-1ubuntu0.8+esm2"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): 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