CVE-2026-50046 Possible heap use-after-free in an error path when a DoT forwarded query is jostled out

In NLnet Labs Unbound 1.15.0 up to and including 1.25.1, the TLS server name used for DNS-over-TLS DoT forwarded queries is tied to a struct's 'servicedquery' lifetime but also referenced by another struct 'waitingtcp'. When the owning struct is jostled out of the mesh while the DoT TCP stream is...

CVE-2026-50046

NLnet Labs Unbound 1.15.0–1.25.1 contains a heap use-after-free in the DoT path. The TLS server name for DoT forwarded queries is tied to a serviced_query object that is also referenced by waiting_tcp. If the owning struct is jostled out of the mesh while DoT TCP handshake is in progress, freeing...

EUVD-2026-47672

In NLnet Labs Unbound 1.15.0 up to and including 1.25.1, the TLS server name used for DNS-over-TLS DoT forwarded queries is tied to a struct's 'servicedquery' lifetime but also referenced by another struct 'waitingtcp'. When the owning struct is jostled out of the mesh while the DoT TCP stream is...

CVE-2026-50046

In NLnet Labs Unbound 1.15.0 up to and including 1.25.1, the TLS server name used for DNS-over-TLS DoT forwarded queries is tied to a struct's 'servicedquery' lifetime but also referenced by another struct 'waitingtcp'. When the owning struct is jostled out of the mesh while the DoT TCP stream is...

CVE-2026-44690

The CVE-2026-44690 entry concerns NLnet Labs Unbound versions 1.7.0 through 1.25.1 where insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing enables cache poisoning. A malicious actor controlling a single delegated zone...

CVE-2026-44690 Cross-zone wildcard cache poisoning via RRSIG.labels manipulation

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning that permits a malicious actor controlling a single delegated zone to poison arbitrary...

CVE-2026-44690

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, insufficient validation of the RRSIG.Labels field combined with premature cache writes during RFC 8198 aggressive NSEC processing leads to cache poisoning that permits a malicious actor controlling a single delegated zone to poison arbitrary...

CVE-2026-44687

CVE-2026-44687 affects NLnet Labs Unbound releases 1.13.2 through 1.25.1. A bug in the default tallied logic for hardened-below-nxdomain can cause a stub or forward zone to be shadowed by a DNSSEC-secure NXDOMAIN answer at the parent when the query name is an intermediate label below a signed zon...

CVE-2026-44687 Off-by-one error in 'harden-below-nxdomain' logic can shadow a stub/forward zone by a legitimate parent's NXDOMAIN

In NLnet Labs Unbound 1.13.2 up to and including 1.25.1, stub or forward zones where the name is below an intermediate labed below a DNSSEC signed zone could be shadowed by the intermediate label's secure NXDOMAIN answer from the parent. This is caused by an off-by-one error in...

CVE-2026-44687 Off-by-one error in 'harden-below-nxdomain' logic can shadow a stub/forward zone by a legitimate parent's NXDOMAIN

In NLnet Labs Unbound 1.13.2 up to and including 1.25.1, stub or forward zones where the name is below an intermediate labed below a DNSSEC signed zone could be shadowed by the intermediate label's secure NXDOMAIN answer from the parent. This is caused by an off-by-one error in...

CVE-2026-44687

In NLnet Labs Unbound 1.13.2 up to and including 1.25.1, stub or forward zones where the name is below an intermediate labed below a DNSSEC signed zone could be shadowed by the intermediate label's secure NXDOMAIN answer from the parent. This is caused by an off-by-one error in...

CVE-2026-42955

In NLnet Labs Unbound 1.16.2 up to and including 1.25.1, a similar vulnerability as with CVE-2026-40622 in the 'ghost domain names' family of attacks was found in Unbound that could extend the ghost domain window by up to one cached TTL configured value for A/AAAA glue records. Similar to other...

CVE-2026-44687: Off-by-one Error

In NLnet Labs Unbound 1.13.2 up to and including 1.25.1, stub or forward zones where the name is below an intermediate labed below a DNSSEC signed zone could be shadowed by the intermediate label's secure NXDOMAIN answer from the parent. This is caused by an off-by-one error in...

PT-2026-63373

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.16.2 through 1.25.1 Description An issue exists within the ghost domain names family of attacks where an adversary controlling a ghost zone can extend the ghost domain window for A/AAAA glue records. By sending a...

CVE-2026-50248: Insufficient Verification of Data Authenticity

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when an auth/rpz zone has a configured primary hostname that resolves to BOGUS A/AAAA, it is still considered as a possible XFR endpoint. A malicious actor that can spoof the hostname's A/AAAA record no valid RRSIG required becomes the zone'...

PT-2026-63381

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.6.2 through 1.25.1 Description When configured with the respip module before the validator, along with a response-ip redirect rule or an RPZ file using an RPZ-IP trigger, the rewriting handler fails to verify the...

CVE-2026-55708: Initialization of a Resource with an Insecure Default

In NLnet Labs Unbound 1.6.0 up to and including 1.25.1, the 'viewlocaldata' and 'viewlocaldatas' commands of 'unbound-control' create a bare local zones tree for an already configured named view when the view is configured with no local data to begin with. However, the creation through the contro...

PT-2026-63382

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.7.0 through 1.25.1 Description An issue exists where an auth/rpz zone with a configured primary hostname that resolves to BOGUS A/AAAA records is still treated as a potential XFR endpoint. XFR Zone Transfer is a...

PT-2026-63380

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.15.0 through 1.25.1 Description A use-after-free issue exists in the handling of DNS-over-TLS DoT forwarded queries. The TLS server name is tied to the lifetime of the serviced query struct but is also referenced ...

PT-2026-63389

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.23.0 through 1.25.1 Description When the dns-error-reporting: yes setting is enabled, the software incorrectly processes the EDNS Report-Channel option code 18 from upstream responses. Specifically, it uses the...