{"id":"UBUNTU-CVE-2026-34933","details":"Avahi is a system which facilitates service discovery on a local network via the mDNS/DNS-SD protocol suite. Prior to version 0.9-rc4, any unprivileged local user can crash avahi-daemon by sending a single D-Bus method call with conflicting publish flags. This issue has been patched in version 0.9-rc4.","modified":"2026-08-19T19:14:12.915900393Z","published":"2026-04-03T23:17:00Z","related":["USN-8269-1"],"upstream":["CVE-2026-34933"],"references":[{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-34933"},{"type":"REPORT","url":"https://www.cve.org/CVERecord?id=CVE-2026-34933"},{"type":"REPORT","url":"https://github.com/avahi/avahi/security/advisories/GHSA-w65r-6gxh-vhvc"},{"type":"REPORT","url":"https://github.com/avahi/avahi/pull/891"},{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8269-1"}],"affected":[{"package":{"name":"avahi","ecosystem":"Ubuntu:Pro:14.04:LTS","purl":"pkg:deb/ubuntu/avahi?arch=source&distro=esm-infra-legacy%2Ftrusty"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.31-4ubuntu1.3+esm5"}]}],"versions":["0.6.31-2ubuntu4","0.6.31-2ubuntu5","0.6.31-3ubuntu1","0.6.31-4ubuntu1","0.6.31-4ubuntu1.1","0.6.31-4ubuntu1.2","0.6.31-4ubuntu1.3","0.6.31-4ubuntu1.3+esm1","0.6.31-4ubuntu1.3+esm2","0.6.31-4ubuntu1.3+esm3","0.6.31-4ubuntu1.3+esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.31-4ubuntu1.3+esm5","binary_name":"avahi-autoipd"},{"binary_name":"avahi-daemon","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_name":"avahi-discover","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_name":"avahi-dnsconfd","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_version":"0.6.31-4ubuntu1.3+esm5","binary_name":"avahi-ui-utils"},{"binary_name":"avahi-utils","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_name":"libavahi-client3","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_version":"0.6.31-4ubuntu1.3+esm5","binary_name":"libavahi-common-data"},{"binary_name":"libavahi-common3","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_version":"0.6.31-4ubuntu1.3+esm5","binary_name":"libavahi-compat-libdnssd1"},{"binary_version":"0.6.31-4ubuntu1.3+esm5","binary_name":"libavahi-core7"},{"binary_version":"0.6.31-4ubuntu1.3+esm5","binary_name":"libavahi-glib1"},{"binary_name":"libavahi-gobject0","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_version":"0.6.31-4ubuntu1.3+esm5","binary_name":"libavahi-qt4-1"},{"binary_name":"libavahi-ui-gtk3-0","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_name":"libavahi-ui0","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_name":"python-avahi","binary_version":"0.6.31-4ubuntu1.3+esm5"}],"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/cve/2026/UBUNTU-CVE-2026-34933.json"}},{"package":{"name":"avahi","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/avahi?arch=source&distro=esm-infra%2Fxenial"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"}]}],"versions":["0.6.31-4ubuntu4","0.6.32~rc+dfsg-1ubuntu2","0.6.32~rc+dfsg-1ubuntu2.1","0.6.32~rc+dfsg-1ubuntu2.2","0.6.32~rc+dfsg-1ubuntu2.3","0.6.32~rc+dfsg-1ubuntu2.3+esm1","0.6.32~rc+dfsg-1ubuntu2.3+esm2","0.6.32~rc+dfsg-1ubuntu2.3+esm3","0.6.32~rc+dfsg-1ubuntu2.3+esm4"],"ecosystem_specific":{"binaries":[{"binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5","binary_name":"avahi-autoipd"},{"binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5","binary_name":"avahi-daemon"},{"binary_name":"avahi-discover","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"avahi-dnsconfd","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"avahi-ui-utils","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"avahi-utils","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"libavahi-client3","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"libavahi-common-data","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5","binary_name":"libavahi-common3"},{"binary_name":"libavahi-compat-libdnssd1","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5","binary_name":"libavahi-core7"},{"binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5","binary_name":"libavahi-glib1"},{"binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5","binary_name":"libavahi-gobject0"},{"binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5","binary_name":"libavahi-qt4-1"},{"binary_name":"libavahi-ui-gtk3-0","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5","binary_name":"libavahi-ui0"},{"binary_name":"python-avahi","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34933.json"}},{"package":{"name":"avahi","ecosystem":"Ubuntu:Pro:18.04:LTS","purl":"pkg:deb/ubuntu/avahi?arch=source&distro=esm-infra%2Fbionic"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7-3.1ubuntu1.3+esm4"}]}],"versions":["0.6.32-1ubuntu1","0.7-3ubuntu1","0.7-3ubuntu2","0.7-3.1ubuntu1","0.7-3.1ubuntu1.1","0.7-3.1ubuntu1.2","0.7-3.1ubuntu1.3","0.7-3.1ubuntu1.3+esm1","0.7-3.1ubuntu1.3+esm2","0.7-3.1ubuntu1.3+esm3"],"ecosystem_specific":{"binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_version":"0.7-3.1ubuntu1.3+esm4","binary_name":"avahi-daemon"},{"binary_name":"avahi-discover","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_name":"avahi-dnsconfd","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_name":"avahi-ui-utils","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_version":"0.7-3.1ubuntu1.3+esm4","binary_name":"avahi-utils"},{"binary_name":"gir1.2-avahi-0.6","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_name":"libavahi-client3","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_name":"libavahi-common-data","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_name":"libavahi-common3","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_version":"0.7-3.1ubuntu1.3+esm4","binary_name":"libavahi-compat-libdnssd1"},{"binary_version":"0.7-3.1ubuntu1.3+esm4","binary_name":"libavahi-core7"},{"binary_version":"0.7-3.1ubuntu1.3+esm4","binary_name":"libavahi-glib1"},{"binary_name":"libavahi-gobject0","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_name":"libavahi-ui-gtk3-0","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_version":"0.7-3.1ubuntu1.3+esm4","binary_name":"python-avahi"}],"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34933.json"}},{"package":{"name":"avahi","ecosystem":"Ubuntu:Pro:20.04:LTS","purl":"pkg:deb/ubuntu/avahi?arch=source&distro=esm-infra%2Ffocal"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.7-4ubuntu7.3+esm2"}]}],"versions":["0.7-4ubuntu5","0.7-4ubuntu6","0.7-4ubuntu7","0.7-4ubuntu7.1","0.7-4ubuntu7.2","0.7-4ubuntu7.3","0.7-4ubuntu7.3+esm1"],"ecosystem_specific":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_name":"avahi-daemon","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_version":"0.7-4ubuntu7.3+esm2","binary_name":"avahi-discover"},{"binary_version":"0.7-4ubuntu7.3+esm2","binary_name":"avahi-dnsconfd"},{"binary_name":"avahi-ui-utils","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_version":"0.7-4ubuntu7.3+esm2","binary_name":"avahi-utils"},{"binary_name":"gir1.2-avahi-0.6","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_name":"libavahi-client3","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_name":"libavahi-common-data","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_version":"0.7-4ubuntu7.3+esm2","binary_name":"libavahi-common3"},{"binary_version":"0.7-4ubuntu7.3+esm2","binary_name":"libavahi-compat-libdnssd1"},{"binary_version":"0.7-4ubuntu7.3+esm2","binary_name":"libavahi-core7"},{"binary_name":"libavahi-glib1","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_name":"libavahi-gobject0","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_name":"libavahi-ui-gtk3-0","binary_version":"0.7-4ubuntu7.3+esm2"},{"binary_name":"python-avahi","binary_version":"0.7-4ubuntu7.3+esm2"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34933.json"}},{"package":{"name":"avahi","ecosystem":"Ubuntu:22.04:LTS","purl":"pkg:deb/ubuntu/avahi?arch=source&distro=jammy"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8-5ubuntu5.5"}]}],"versions":["0.8-5ubuntu4","0.8-5ubuntu5","0.8-5ubuntu5.1","0.8-5ubuntu5.2","0.8-5ubuntu5.3","0.8-5ubuntu5.4"],"ecosystem_specific":{"binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.8-5ubuntu5.5"},{"binary_version":"0.8-5ubuntu5.5","binary_name":"avahi-daemon"},{"binary_name":"avahi-discover","binary_version":"0.8-5ubuntu5.5"},{"binary_version":"0.8-5ubuntu5.5","binary_name":"avahi-dnsconfd"},{"binary_name":"avahi-ui-utils","binary_version":"0.8-5ubuntu5.5"},{"binary_name":"avahi-utils","binary_version":"0.8-5ubuntu5.5"},{"binary_version":"0.8-5ubuntu5.5","binary_name":"gir1.2-avahi-0.6"},{"binary_name":"libavahi-client3","binary_version":"0.8-5ubuntu5.5"},{"binary_version":"0.8-5ubuntu5.5","binary_name":"libavahi-common-data"},{"binary_name":"libavahi-common3","binary_version":"0.8-5ubuntu5.5"},{"binary_name":"libavahi-compat-libdnssd1","binary_version":"0.8-5ubuntu5.5"},{"binary_name":"libavahi-core7","binary_version":"0.8-5ubuntu5.5"},{"binary_version":"0.8-5ubuntu5.5","binary_name":"libavahi-glib1"},{"binary_name":"libavahi-gobject0","binary_version":"0.8-5ubuntu5.5"},{"binary_version":"0.8-5ubuntu5.5","binary_name":"libavahi-ui-gtk3-0"},{"binary_name":"python3-avahi","binary_version":"0.8-5ubuntu5.5"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34933.json"}},{"package":{"name":"avahi","ecosystem":"Ubuntu:24.04:LTS","purl":"pkg:deb/ubuntu/avahi?arch=source&distro=noble"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8-13ubuntu6.2"}]}],"versions":["0.8-10ubuntu1","0.8-13ubuntu1","0.8-13ubuntu2","0.8-13ubuntu4","0.8-13ubuntu5","0.8-13ubuntu6","0.8-13ubuntu6.1"],"ecosystem_specific":{"availability":"No subscription 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subscription required","binaries":[{"binary_version":"0.8-16ubuntu3.2","binary_name":"avahi-autoipd"},{"binary_name":"avahi-daemon","binary_version":"0.8-16ubuntu3.2"},{"binary_name":"avahi-discover","binary_version":"0.8-16ubuntu3.2"},{"binary_name":"avahi-dnsconfd","binary_version":"0.8-16ubuntu3.2"},{"binary_version":"0.8-16ubuntu3.2","binary_name":"avahi-ui-utils"},{"binary_name":"avahi-utils","binary_version":"0.8-16ubuntu3.2"},{"binary_name":"gir1.2-avahi-0.6","binary_version":"0.8-16ubuntu3.2"},{"binary_version":"0.8-16ubuntu3.2","binary_name":"libavahi-client3"},{"binary_name":"libavahi-common-data","binary_version":"0.8-16ubuntu3.2"},{"binary_name":"libavahi-common3","binary_version":"0.8-16ubuntu3.2"},{"binary_version":"0.8-16ubuntu3.2","binary_name":"libavahi-compat-libdnssd1"},{"binary_version":"0.8-16ubuntu3.2","binary_name":"libavahi-core7"},{"binary_name":"libavahi-glib1","binary_version":"0.8-16ubuntu3.2"},{"binary_name":"libavahi-gobject0","binary_version":"0.8-16ubuntu3.2"},{"binary_version":"0.8-16ubuntu3.2","binary_name":"libavahi-ui-gtk3-0"},{"binary_version":"0.8-16ubuntu3.2","binary_name":"python3-avahi"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34933.json"}},{"package":{"name":"avahi","ecosystem":"Ubuntu:26.04:LTS","purl":"pkg:deb/ubuntu/avahi?arch=source&distro=resolute"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"0.8-18ubuntu1.1"}]}],"versions":["0.8-16ubuntu3","0.8-17ubuntu1","0.8-17ubuntu2","0.8-18ubuntu1"],"ecosystem_specific":{"binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.8-18ubuntu1.1"},{"binary_name":"avahi-daemon","binary_version":"0.8-18ubuntu1.1"},{"binary_version":"0.8-18ubuntu1.1","binary_name":"avahi-discover"},{"binary_name":"avahi-dnsconfd","binary_version":"0.8-18ubuntu1.1"},{"binary_version":"0.8-18ubuntu1.1","binary_name":"avahi-ui-utils"},{"binary_name":"avahi-utils","binary_version":"0.8-18ubuntu1.1"},{"binary_version":"0.8-18ubuntu1.1","binary_name":"gir1.2-avahi-0.6"},{"binary_name":"libavahi-client3","binary_version":"0.8-18ubuntu1.1"},{"binary_name":"libavahi-common-data","binary_version":"0.8-18ubuntu1.1"},{"binary_name":"libavahi-common3","binary_version":"0.8-18ubuntu1.1"},{"binary_name":"libavahi-compat-libdnssd1","binary_version":"0.8-18ubuntu1.1"},{"binary_name":"libavahi-core7","binary_version":"0.8-18ubuntu1.1"},{"binary_name":"libavahi-glib1","binary_version":"0.8-18ubuntu1.1"},{"binary_name":"libavahi-gobject0","binary_version":"0.8-18ubuntu1.1"},{"binary_version":"0.8-18ubuntu1.1","binary_name":"libavahi-ui-gtk3-0"},{"binary_name":"python3-avahi","binary_version":"0.8-18ubuntu1.1"}],"availability":"No subscription required"},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-34933.json"}}],"schema_version":"1.9.0","severity":[{"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"}]}