{"id":"USN-8269-1","summary":"avahi vulnerabilities","details":"It is discovered that Avahi incorrectly handled crafted input. A\nremote attacker could possibly use this issue to crash the program,\nresulting in a denial of service. This issue only affected Ubuntu\n14.04 LTS, Ubuntu 16.04 LTS, Ubuntu 18.04 LTS, Ubuntu 20.04 LTS,\nUbuntu 22.04 LTS and Ubuntu 24.04 LTS. (CVE-2026-24401)\n\nGuillaume Meunier discovered that Avahi incorrectly handled crafted\ninput. An attacker could possibly use this issue to crash the\nprogram, resulting in a denial of service. (CVE-2026-34933)","modified":"2026-05-22T17:16:55.591510218Z","published":"2026-05-12T15:21:20Z","related":["UBUNTU-CVE-2026-24401","UBUNTU-CVE-2026-34933"],"upstream":["UBUNTU-CVE-2026-24401","UBUNTU-CVE-2026-34933"],"references":[{"type":"ADVISORY","url":"https://ubuntu.com/security/notices/USN-8269-1"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-24401"},{"type":"REPORT","url":"https://ubuntu.com/security/CVE-2026-34933"}],"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":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"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_name":"avahi-ui-utils","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"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_name":"libavahi-common-data","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_name":"libavahi-common3","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_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_name":"libavahi-gobject0","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"binary_name":"libavahi-qt4-1","binary_version":"0.6.31-4ubuntu1.3+esm5"},{"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"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8269-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:14.04:LTS","cves":[{"id":"CVE-2026-24401","severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}]},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-34933"}]}}},{"package":{"name":"avahi","ecosystem":"Ubuntu:Pro:16.04:LTS","purl":"pkg:deb/ubuntu/avahi?arch=source&distro=esm-infra-legacy%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":{"availability":"Available with Ubuntu Pro with Legacy support add-on: https://ubuntu.com/pro","binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"avahi-daemon","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"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_name":"libavahi-common3","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"libavahi-compat-libdnssd1","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_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"libavahi-ui-gtk3-0","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"libavahi-ui0","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"},{"binary_name":"python-avahi","binary_version":"0.6.32~rc+dfsg-1ubuntu2.3+esm5"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8269-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:16.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-24401"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-34933"}]}}},{"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":{"availability":"Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro","binaries":[{"binary_name":"avahi-autoipd","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"binary_name":"avahi-daemon","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"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_name":"avahi-utils","binary_version":"0.7-3.1ubuntu1.3+esm4"},{"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_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_version":"0.7-3.1ubuntu1.3+esm4"},{"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_name":"python-avahi","binary_version":"0.7-3.1ubuntu1.3+esm4"}]},"database_specific":{"source":"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8269-1.json","cves_map":{"ecosystem":"Ubuntu:Pro:18.04:LTS","cves":[{"severity":[{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-24401"},{"severity":[{"score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","type":"CVSS_V3"},{"score":"medium","type":"Ubuntu"}],"id":"CVE-2026-34933"}]}}},{"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 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