CVE-2026-41292 affecting package unbound for versions less than 1.25.1-1

CVE-2026-41292 affecting package unbound for versions less than 1.25.1-1. An upgraded version of the package is available that resolves this issue...

CVE-2026-44390 affecting package unbound for versions less than 1.25.1-1

CVE-2026-44390 affecting package unbound for versions less than 1.25.1-1. An upgraded version of the package is available that resolves this issue...

CVE-2026-42959 affecting package unbound for versions less than 1.25.1-1

CVE-2026-42959 affecting package unbound for versions less than 1.25.1-1. An upgraded version of the package is available that resolves this issue...

CVE-2026-40622 affecting package unbound for versions less than 1.25.1-1

CVE-2026-40622 affecting package unbound for versions less than 1.25.1-1. An upgraded version of the package is available that resolves this issue...

CVE-2026-42923 affecting package unbound for versions less than 1.25.1-1

CVE-2026-42923 affecting package unbound for versions less than 1.25.1-1. An upgraded version of the package is available that resolves this issue...

CVE-2026-42944 affecting package unbound for versions less than 1.25.1-1

CVE-2026-42944 affecting package unbound for versions less than 1.25.1-1. An upgraded version of the package is available that resolves this issue...

CLSA-2026-1779533909 unbound: Fix of 3 CVEs

CVE-2026-33278: dangling pointer dereference in dnsmsgdeepcopyregion during DS sub-query suspend/resume; the previously-backported CVE-2023-50387-CVE-2023-50868.patch dragged the vulnerable 'res-rep = origin-rep;' struct-assignment into our 1.16.2 tree. Save the destination rrsets pointer,...

CLSA-2026-1779467733 unbound: Fix of CVE-2026-33278

CVE-2026-33278: fix dangling pointer use-after-free in dnsmsgdeepcopyregion...

CLSA-2026-1779467038 unbound: Fix of CVE-2026-33278

CVE-2026-33278: fix dangling pointer use-after-free in dnsmsgdeepcopyregion...

CVE-2026-44608

A flaw was found in Unbound. When operating in a multi-threaded configuration with specific Response Policy Zones RPZ using 'rpz-nsip' or 'rpz-nsdname' triggers, a locking inconsistency during an RPZ zone transfer XFR reload can occur. This timing issue may allow an adversary to trigger a heap...

Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS : Unbound vulnerabilities (USN-8282-1)

The remote Ubuntu 22.04 LTS / 24.04 LTS / 25.10 / 26.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8282-1 advisory. Andrew Griffiths discovered that Unbound did not properly handle certain DNSCrypt packets. A remote attacker could possib...

unbound: Unbound: Denial of Service due to locking inconsistency during RPZ XFR reload

A flaw was found in Unbound. When operating in a multi-threaded configuration with specific Response Policy Zones RPZ using 'rpz-nsip' or 'rpz-nsdname' triggers, a locking inconsistency during an RPZ zone transfer XFR reload can occur. This timing issue may allow an adversary to trigger a heap...

unbound: Unbound DNSSEC Validator Use-After-Free via Deep Copy Pointer Overwrite Leading to DoS and Possible Remote Code Execution

A flaw was discovered in Unbound’s DNSSEC validator can leave it using an invalid memory pointer after certain DS sub-query validations fail due to NSEC3 budget exhaustion. This may cause crashes and could potentially allow arbitrary code execution...

Important: Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

An update for Red Hat Hardened Images RPMs is now available. This update includes the following RPMs: unbound: python3-unbound-1.25.1-0.1.hum1 aarch64, x8664 unbound-1.25.1-0.1.hum1 aarch64, x8664 unbound-anchor-1.25.1-0.1.hum1 aarch64, x8664 unbound-devel-1.25.1-0.1.hum1 aarch64, x8664...

unbound: Unbound DNSSEC Validator Denial of Service via Incorrect Write Offset Counter in Chase-Reply Messages

A flaw was found in Unbound's DNSSEC validator when constructing chase-reply messages for validation. The code uses the wrong counter to calculate write offsets for ADDITIONAL section resource record sets. When a DNAME chain is combined with authority filtering, an uninitialized array slot is...

USN-8282-1 unbound vulnerabilities

Andrew Griffiths discovered that Unbound did not properly handle certain DNSCrypt packets. A remote attacker could possibly use this issue to cause Unbound to crash, resulting in a denial of service. CVE-2026-32792 Qifan Zhang discovered that Unbound incorrectly handled DNSSEC validation in certa...

CVE-2026-42959

A flaw was found in Unbound's DNSSEC validator when constructing chase-reply messages for validation. The code uses the wrong counter to calculate write offsets for ADDITIONAL section resource record sets. When a DNAME chain is combined with authority filtering, an uninitialized array slot is...

CVE-2026-42944

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...

CVE-2026-33278

A flaw was discovered in Unbound’s DNSSEC validator can leave it using an invalid memory pointer after certain DS sub-query validations fail due to NSEC3 budget exhaustion. This may cause crashes and could potentially allow arbitrary code execution...

CVE-2026-44390

NLnet Labs Unbound up to and including version 1.25.0 has a vulnerability when handling replies with very large RRsets that Unbound needs to perform name compression for. Malicious upstream responses with very large RRsets with records that don't share a suffix above the root can cause Unbound to...