RLSA-2026:36777 Important: unbound security update

The unbound packages provide a validating, recursive, and caching DNS or DNSSEC resolver. Security Fixes: unbound: Unbound: Denial of Service via excessive EDNS options CVE-2026-41292 unbound: Unbound: Cache manipulation via 'ghost domain names' attack CVE-2026-40622 unbound: Unbound: Denial of...

unbound: Unbound: Denial of Service via excessive EDNS options

A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending queries with an excessive number of EDNS Extension Mechanisms for DNS options. This can cause Unbound threads to be held hostage while parsing and creating internal data structures for these options...

unbound: Unbound: Denial of Service via excessive EDNS options

A flaw was found in Unbound. A remote attacker can exploit this vulnerability by sending queries with an excessive number of EDNS Extension Mechanisms for DNS options. This can cause Unbound threads to be held hostage while parsing and creating internal data structures for these options...

CVE-2026-42004

An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS options that DNSdist did not filter...

CVE-2026-42004 EDNS options smuggling

An attacker can send a crafted EDNS OPT record that will be ignored by DNSdist’s filtering rules, but will be rewritten as a valid OPT record when EDNS Client Subnet is inserted, causing the backend to see the EDNS options that DNSdist did not filter...

unbound: Heap overflow and crash with multiple nsid, cookie, padding EDNS options

A flaw was found in Unbound, a Domain Name System DNS resolver. A remote attacker could trigger a heap overflow by sending specially crafted DNS reply packets. This occurs when Unbound attempts to encode multiple Name Server Identifier NSID or Extension Mechanisms for DNS EDNS Cookie options, or...

SUSE CVE-2026-41292

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data...

SUSE-SU-2026:21913-1 Security update for unbound

This update for unbound fixes the following issues - CVE-2026-32792: Packet of death with DNSCrypt bsc1265583. - CVE-2026-33278: Possible remote code execution during DNSSEC validation bsc1265587. - CVE-2026-40622: "Ghost domain name" variant bsc1265581. - CVE-2026-41292: Parsing a long list of...

CVE-2026-41292

NLnet Labs Unbound up to and including version 1.25.0 is vulnerable to a degradation of service attack related to parsing long lists of incoming EDNS options. An adversary sending queries with too many EDNS options can hold Unbound threads hostage while they are parsing and creating internal data...

PT-2026-42131

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.14.0 through 1.25.0 Description A heap overflow occurs when encoding multiple NSID, DNS Cookie EDNS, and EDNS Padding options in a reply packet. This happens because a flaw in the size calculation of the EDNS fiel...