UnratedFix available
Fix CVE(s): CVE-2021-26720
Type: advisorySources: OSV
* SECURITY UPDATE: local symlink attack through the unicast .local DNS check: /etc/network/if-up.d/avahi-daemon exec's /usr/lib/avahi/avahi-daemon-check-dns.sh as root, and the script writes into /run/avahi-daemon (the checked_nameservers[.$$] cache and the disabled-for-unicast-local tag) without protecting against symlinks, so a local attacker able to place symlinks in that avahi-owned directory can make root create arbitrary empty files or cause a denial of service. - debian/avahi-daemon.if-up: run the check script under "sudo -u avahi -g avahi" instead of exec'ing it as root, so the writes are performed by the same unprivileged account that owns /run/avahi-daemon. Backported verbatim from Debian stretch 0.6.32-2+deb9u1 (DLA-3047-1); the alternative vendor fix, dropping the check-dns mechanism outright (Debian buster 0.7-4+deb10u1, Ubuntu focal 0.7-4ubuntu7), is not applicable here because bionic ships libnss-mdns 0.10-8ubuntu1, the same generation as stretch. - debian/control: add sudo to the avahi-daemon Depends, required by the privilege drop. - CVE-2021-26720
- Products
- avahi-autoipd, avahi-daemon, avahi-discover, avahi-dnsconfd, avahi-ui-utils, avahi-utils, gir1.2-avahi-0.6, libavahi-client-dev, libavahi-client3, libavahi-common-data, libavahi-common-dev, libavahi-common3, libavahi-compat-libdnssd-dev, libavahi-compat-libdnssd1, libavahi-core-dev, libavahi-core7, libavahi-glib-dev, libavahi-glib1, libavahi-gobject-dev, libavahi-gobject0, libavahi-ui-gtk3-0, libavahi-ui-gtk3-dev, python-avahi
- Affected versions
- Not specified
- Fixed versions
- 0.7-3.1ubuntu1.3+tuxcare.els1
- CVEs
- CVE-2021-26720
- Confirmed fixed CVEs
- Not specified
- Updated in this feed
- 1 Nov 2026, 11:41 UTC · Revision 1
Source evidence
* SECURITY UPDATE: local symlink attack through the unicast .local DNS check: /etc/network/if-up.d/avahi-daemon exec's /usr/lib/avahi/avahi-daemon-check-dns.sh as root, and the script writes into /run/avahi-daemon (the checked_nameservers[.$$] cache and the disabled-for-unicast-local tag) without protecting against symlinks, so a local attacker able to place symlinks in that avahi-owned directory can make root create arbitrary empty files or cause a denial of service. - debian/avahi-daemon.if-up: run the check script under "sudo -u avahi -g avahi" instead of exec'ing it as root, so the writes are performed by the same unprivileged account that owns /run/avahi-daemon. Backported verbatim from Debian stretch 0.6.32-2+deb9u1 (DLA-3047-1); the alternative vendor fix, dropping the check-dns mechanism outright (Debian buster 0.7-4+deb10u1, Ubuntu focal 0.7-4ubuntu7), is not applicable here because bionic ships libnss-mdns 0.10-8ubuntu1, the same generation as stretch. - debian/control: add sudo to the avahi-daemon Depends, required by the privilege drop. - CVE-2021-26720
osv:CLSA-2026-1787932412
avahi-autoipd
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
avahi-daemon
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
avahi-discover
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
avahi-dnsconfd
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
avahi-ui-utils
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
avahi-utils
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
gir1.2-avahi-0.6
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-client-dev
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-client3
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-common-data
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-common-dev
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-common3
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-compat-libdnssd-dev
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-compat-libdnssd1
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-core-dev
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-core7
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-glib-dev
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-glib1
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-gobject-dev
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-gobject0
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-ui-gtk3-0
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
libavahi-ui-gtk3-dev
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
python-avahi
Fixed versions: 0.7-3.1ubuntu1.3+tuxcare.els1
Complete source record
{
"id": "67227a86e17e056dcd035797a6fbdabdc8bf964a9872a3612892aa11066ed96f",
"url": "https://osv.dev/vulnerability/CLSA-2026-1787932412",
"method": "structured",
"payload": {
"kind": "advisory",
"title": "Fix CVE(s): CVE-2021-26720",
"summary": "* SECURITY UPDATE: local symlink attack through the unicast .local DNS check: /etc/network/if-up.d/avahi-daemon exec's /usr/lib/avahi/avahi-daemon-check-dns.sh as root, and the script writes into /run/avahi-daemon (the checked_nameservers[.$$] cache and the disabled-for-unicast-local tag) without protecting against symlinks, so a local attacker able to place symlinks in that avahi-owned directory can make root create arbitrary empty files or cause a denial of service. - debian/avahi-daemon.if-up: run the check script under \"sudo -u avahi -g avahi\" instead of exec'ing it as root, so the writes are performed by the same unprivileged account that owns /run/avahi-daemon. Backported verbatim from Debian stretch 0.6.32-2+deb9u1 (DLA-3047-1); the alternative vendor fix, dropping the check-dns mechanism outright (Debian buster 0.7-4+deb10u1, Ubuntu focal 0.7-4ubuntu7), is not applicable here because bionic ships libnss-mdns 0.10-8ubuntu1, the same generation as stretch. - debian/control: add sudo to the avahi-daemon Depends, required by the privilege drop. - CVE-2021-26720",
"evidence": "osv:CLSA-2026-1787932412",
"products": [
{
"name": {
"value": "avahi-autoipd",
"evidence": "/affected/0/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/0/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "avahi-daemon",
"evidence": "/affected/1/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/1/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "avahi-discover",
"evidence": "/affected/2/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/2/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "avahi-dnsconfd",
"evidence": "/affected/3/package/name"
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"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/3/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "avahi-ui-utils",
"evidence": "/affected/4/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/4/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "avahi-utils",
"evidence": "/affected/5/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/5/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "gir1.2-avahi-0.6",
"evidence": "/affected/6/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/6/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-client-dev",
"evidence": "/affected/7/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/7/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-client3",
"evidence": "/affected/8/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/8/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-common-data",
"evidence": "/affected/9/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/9/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-common-dev",
"evidence": "/affected/10/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/10/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-common3",
"evidence": "/affected/11/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/11/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-compat-libdnssd-dev",
"evidence": "/affected/12/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/12/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-compat-libdnssd1",
"evidence": "/affected/13/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/13/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-core-dev",
"evidence": "/affected/14/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/14/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-core7",
"evidence": "/affected/15/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/15/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-glib-dev",
"evidence": "/affected/16/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/16/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-glib1",
"evidence": "/affected/17/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/17/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-gobject-dev",
"evidence": "/affected/18/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/18/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-gobject0",
"evidence": "/affected/19/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/19/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-ui-gtk3-0",
"evidence": "/affected/20/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/20/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "libavahi-ui-gtk3-dev",
"evidence": "/affected/21/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/21/ranges"
}
],
"affected_versions": []
},
{
"name": {
"value": "python-avahi",
"evidence": "/affected/22/package/name"
},
"prerequisites": [],
"fixed_versions": [
{
"value": "0.7-3.1ubuntu1.3+tuxcare.els1",
"evidence": "/affected/22/ranges"
}
],
"affected_versions": []
}
],
"severity": "unknown",
"structured": {
"id": "CLSA-2026-1787932412",
"aliases": [
"CLSA-2026-1787932412"
],
"affected": [
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "avahi-autoipd",
"purl": "pkg:deb/tuxcare/avahi-autoipd?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "avahi-daemon",
"purl": "pkg:deb/tuxcare/avahi-daemon?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "avahi-discover",
"purl": "pkg:deb/tuxcare/avahi-discover?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "avahi-dnsconfd",
"purl": "pkg:deb/tuxcare/avahi-dnsconfd?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "avahi-ui-utils",
"purl": "pkg:deb/tuxcare/avahi-ui-utils?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "avahi-utils",
"purl": "pkg:deb/tuxcare/avahi-utils?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "gir1.2-avahi-0.6",
"purl": "pkg:deb/tuxcare/gir1.2-avahi-0.6?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "libavahi-client-dev",
"purl": "pkg:deb/tuxcare/libavahi-client-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "libavahi-client3",
"purl": "pkg:deb/tuxcare/libavahi-client3?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "libavahi-common-data",
"purl": "pkg:deb/tuxcare/libavahi-common-data?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "libavahi-common-dev",
"purl": "pkg:deb/tuxcare/libavahi-common-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "libavahi-common3",
"purl": "pkg:deb/tuxcare/libavahi-common3?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "libavahi-compat-libdnssd-dev",
"purl": "pkg:deb/tuxcare/libavahi-compat-libdnssd-dev?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "libavahi-compat-libdnssd1",
"purl": "pkg:deb/tuxcare/libavahi-compat-libdnssd1?distro=ubuntu-18.04",
"ecosystem": "TuxCare:Ubuntu:18.04"
},
"database_specific": {
"source": "https://github.com/cloudlinux/tuxcare-osv/tree/main/data/els_os/ubuntu18.04els/CLSA-2026-1787932412.json"
}
},
{
"ranges": [
{
"type": "ECOSYSTEM",
"events": [
{
"introduced": "0"
},
{
"fixed": "0.7-3.1ubuntu1.3+tuxcare.els1"
}
]
}
],
"package": {
"name": "libavahi-core-dev",
"purl": "pkg:deb/tuxcare/libavahi-core-dev?distro=ubuntu-18.04",
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"package": {
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],
"modified": "2026-10-26T09:32:03.753629424Z",
"provider": "osv",
"upstream": [
"CVE-2021-26720"
],
"references": [
"https://errata.tuxcare.com/els_os/ubuntu18.04els/CLSA-2026-1787932412.html",
"https://nvd.nist.gov/vuln/detail/CVE-2021-26720"
]
},
"related_cves": [
{
"value": "CVE-2021-26720",
"evidence": "/upstream"
}
],
"security_relevant": true,
"severity_evidence": null
},
"source_id": "core-osv",
"document_id": 449549,
"published_at": "2026-08-29T10:28:02+00:00"
}