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EUVD-2026-339380

fkie_cve-2026-41637

In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, client terminated DNS-over-QUIC (DoQ) queries are not accounted properly by Unbound resulting in low-cost inflation of the waiting number of replies for already in-flight resolution queries. This results in degradation of resolution service for new clients for already in-flight queries. A malicious actor can exploit the vulnerability by issuing DoQ queries for query names that need resolution and proceeding on immediately terminating the query by one of STOP_SENDING/RESET_STREAM/CONNECTION_CLOSE QUIC frames. Those terminated DoQ queries are not properly counted for and keep inflating the number of waiting replies for in-flight queries. When the maximum is reached, it results in silent query drops for new clients needing resolution for already in-flight queries. This vulnerability needs Unbound to be compiled with DoQ support ('--with-libngtcp2') and the 'quic-port' to be configured for the listening interfaces. Additionally, a malicious actor needs access to multiple source IPs to bypass the by-default configured 'wait-limit' option.

GHSA-6cj4-j994-m7pr

msrc_CVE-2026-41637 — Degradation of resolution service from improperly accounted client-terminated DNS-over-QUIC queries

msrc_CVE-2026-41637

openSUSE-SU-2026:11380-1 — libunbound8-1.25.2-1.1 on GA media

libunbound8-1.25.2-1.1 on GA media

RHSA-2026:43588 — Red Hat Security Advisory: Red Hat Hardened Images RPMs bug fix and enhancement update

unbound: Unbound: Denial of Service via assertion failure in DNS-over-QUIC environments unbound: Unbound: Denial of Service via improper validation of DNS-over-QUIC client length unbound: Unbound: Denial of Service via crafted DNSCrypt query unbound: Unbound: Denial of Service via terminated DNS-over-QUIC queries unbound: Unbound: DNS cache integrity issue unbound: Unbound: Denial of Service due to 'harden-below-nxdomain' logic bypass unbound: Unbound: Cache poisoning via insufficient RRSIG.Labels validation and premature cache writes unbound: Unbound: Information disclosure via DNSSEC wildcard replay unbound: Unbound: Denial of Service via DNSSEC query amplification bypass unbound: Unbound: Denial of Service due to freed pointer dereference in DNS-over-TLS handling unbound: Unbound: Insecure DNS redirection via spoofed DNS answers unbound: Unbound: DNS response policy replacement via hostname spoofing unbound: NLnet Labs Unbound: Denial of Service via crafted DNS glue records unbound: Unbound: DNS cache poisoning via UDP source port predictability unbound: Unbound: Denial of service due to memory corruption under specific configurations. unbound: Unbound: DNS Cookie security bypass via incorrect server cookie calculation unbound: Unbound: Information disclosure due to local policy bypass via unbound-control unbound: Unbound: Denial of Service via crafted DNS responses with expired records unbound: Unbound: Denial of Service via malformed EDNS Report-Channel option unbound:…

SUSE-SU-2026:23050-1 — Security update for unbound

Security update for unbound

UBUNTU-CVE-2026-41637

Affected: Ubuntu:Pro:14.04:LTS: unbound, Ubuntu:Pro:16.04:LTS: unbound, Ubuntu:Pro:18.04:LTS: unbound, Ubuntu:Pro:20.04:LTS: unbound, Ubuntu:22.04:LTS: unbound, Ubuntu:24.04:LTS: unbound, Ubuntu:26.04:LTS: unbound

WID-SEC-W-2026-2492 — Unbound: Mehrere Schwachstellen

Ein Angreifer kann mehrere Schwachstellen in Unbound ausnutzen, um einen Denial of Service Angriff durchzuführen, um Informationen offenzulegen, um Daten zu manipulieren, und um Sicherheitsvorkehrungen zu umgehen.