CVE-2026-55990

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provider-cert:' files than there are matching 'dnscrypt-secret-key:' files, Unbound fills only the matched prefix and leaves the tail slots at the '0xdb' fill that libsodium's allocator writes...

CVE-2026-40691

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger th...

unbound: NLnet Labs Unbound: Denial of Service via faulty DNSCrypt configuration

A flaw was found in Unbound when configured with DNSCrypt support. An unauthenticated remote attacker could exploit a faulty configuration, where an imbalance between DNSCrypt provider certificate and secret key files leads to memory corruption. By sending a specially crafted network request, the...

unbound: Unbound: Denial of Service via crafted DNSCrypt query

A flaw was found in Unbound, a domain name system DNS resolver. When Unbound is configured with DNSCrypt support, a remote attacker could send a specially crafted DNSCrypt query over TCP. This malicious query could cause a memory error, leading to a server crash and a Denial of Service DoS. This...

CVE-2026-55990 Packet of death for a DNSCrypt misconfigured Unbound

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provider-cert:' files than there are matching 'dnscrypt-secret-key:' files, Unbound fills only the matched prefix and leaves the tail slots at the '0xdb' fill that libsodium's allocator writes...

CVE-2026-55990 Packet of death for a DNSCrypt misconfigured Unbound

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provider-cert:' files than there are matching 'dnscrypt-secret-key:' files, Unbound fills only the matched prefix and leaves the tail slots at the '0xdb' fill that libsodium's allocator writes...

EUVD-2026-47682

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provider-cert:' files than there are matching 'dnscrypt-secret-key:' files, Unbound fills only the matched prefix and leaves the tail slots at the '0xdb' fill that libsodium's allocator writes...

CVE-2026-55990

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provider-cert:' files than there are matching 'dnscrypt-secret-key:' files, Unbound fills only the matched prefix and leaves the tail slots at the '0xdb' fill that libsodium's allocator writes...

CVE-2026-55990

CVE-2026-55990 affects NLnet Labs Unbound 1.7.0 through 1.25.1. If the dnscrypt: clause lists more dnscrypt-provider-cert: files than there are matching dnscrypt-secret-key: files, Unbound only fills the matched prefix and leaves tail slots as 0xdb-filled garbage from libsodium’s allocator. The s...

CVE-2026-40691 Packet of death for DNSCrypt over TCP

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger th...

CVE-2026-40691

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger th...

CVE-2026-40691

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger th...

CVE-2026-40691 Packet of death for DNSCrypt over TCP

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger th...

EUVD-2026-47664

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger th...

CVE-2026-40691: Heap-based Buffer Overflow

In Unbound 1.9.0 up to and including 1.25.1, when a DNSCrypt query is received over TCP, the routine that encrypts the reply in place fails to bound the reply length against the destination buffer size. The size clamp that protects the UDP path is not applied on the TCP path, so a reply larger th...

CVE-2026-55990: Use of Uninitialized Variable

In NLnet Labs Unbound 1.7.0 up to and including 1.25.1, when the 'dnscrypt:' clause lists more 'dnscrypt-provider-cert:' files than there are matching 'dnscrypt-secret-key:' files, Unbound fills only the matched prefix and leaves the tail slots at the '0xdb' fill that libsodium's allocator writes...

PT-2026-63371

Name of the Vulnerable Software and Affected Versions Unbound versions 1.9.0 through 1.25.1 Description A heap-based buffer overflow occurs when a DNSCrypt query is received over TCP. The routine responsible for encrypting the reply in place does not bound the reply length against the destination...

OPENSUSE-RU-2026:21160-1 Recommended update for dnscrypt-proxy

This update for dnscrypt-proxy fixes the following issues: Changes in dnscrypt-proxy: - Update to version 2.1.16 The "tlsciphersuite" option is now a no-op. Modern TLS stacks no longer expose cipher suite selection in a meaningful way, and the option had become misleading A log size of 0 no longe...

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 incoming...

FreeBSD-SA-26:33.unbound

-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA512 ============================================================================= FreeBSD-SA-26:33.unbound Security Advisory The FreeBSD Project Topic: Multiple vulnerabilities in unbound Category: contrib Module: unbound Announced: 2026-06-09 Affects:...