Linux Distros Unpatched Vulnerability : CVE-2026-19401

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - Any remote client can crash a debugging/non-release build type NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cook...

CVE-2026-19401

A flaw was found in NSD. A remote attacker can crash an NSD server child by sending a specially crafted message containing a specific number of DNS Cookie options. This continuous crashing can severely hamper or deny DNS service, leading to a denial of service DoS condition. This vulnerability...

CVE-2026-19401

Any remote client can crash a debugging/non-release build type NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options 17 when UDP payload size is 512. By continuously crashing the serve childs, the remote client can severely hamper or, when...

EUVD-2026-66349

Any remote client can crash a debugging/non-release build type NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options 17 when UDP payload size is 512. By continuously crashing the serve childs, the remote client can severely hamper or, when...

CVE-2026-19401

Any remote client can crash a debugging/non-release build type NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options 17 when UDP payload size is 512. By continuously crashing the serve childs, the remote client can severely hamper or, when...

CVE-2026-19401 Remote UDP DoS by sending multiple DNS Cookie options

Any remote client can crash a debugging/non-release build type NSD serve child by sending it a special crafted message with a specially tuned number of DNS Cookie options 17 when UDP payload size is 512. By continuously crashing the serve childs, the remote client can severely hamper or, when...

CVE-2026-19401

NSD (Name Server Daemon) is vulnerable to a remote UDP denial-of-service targeting its serve child process. An unauthenticated remote attacker can crash the serve child by sending a crafted UDP message containing a specially tuned number of DNS Cookie options (17 when the UDP payload size is 512)...

NSD -- multiple vulnerabilities

NLnet Labs reports: CVE-2026-18664: IP range access control restrictions are bypassed for some unintended IP. Reported by Qifan Zhang from Palo Alto Networks, Claude and Ada Logics. CVE-2026-18916: Any remote client can denial TCP service by throttling the TCP receive window down to 1. Reported b...

EUVD-2026-47678

In NLnet Labs Unbound 1.18.0 up to and including 1.25.1, when Unbound listens on a 'proxy-protocol-port' interface with 'answer-cookie: yes', the RFC 9018 server-cookie SipHash is computed over the proxy's wire address instead of the PROXYv2-declared client. One server cookie obtained through a...

CVE-2026-54478 DNS Cookie bypass when combined with proxy-protocol use

In NLnet Labs Unbound 1.18.0 up to and including 1.25.1, when Unbound listens on a 'proxy-protocol-port' interface with 'answer-cookie: yes', the RFC 9018 server-cookie SipHash is computed over the proxy's wire address instead of the PROXYv2-declared client. One server cookie obtained through a...

PT-2026-63386

Name of the Vulnerable Software and Affected Versions NLnet Labs Unbound versions 1.18.0 through 1.25.1 Description When the software listens on a 'proxy-protocol-port' interface with answer-cookie: yes, the RFC 9018 server-cookie SipHash is computed using the proxy's wire address rather than the...

CVE-2026-42944

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options 'nsid', 'answer-cookie', 'pad-responses' default need to be enabl...

CVE-2026-42944

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options 'nsid', 'answer-cookie', 'pad-responses' default need to be enabl...

CVE-2026-42944 Heap overflow with multiple NSID, COOKIE, PADDING EDNS options

NLnet Labs Unbound 1.14.0 up to and including version 1.25.0 has a vulnerability that results in heap overflow when encoding multiple NSID and/or DNS Cookie EDNS and/or EDNS Padding options in the reply packet. The relevant options 'nsid', 'answer-cookie', 'pad-responses' default need to be enabl...

EUVD-2025-10377

Malicious code in bioql PyPI...

AZL-59742 CVE-2025-31498 affecting package fluent-bit for versions less than 3.1.9-4

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers when processanswer may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed...

CVE-2025-31498

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers when processanswer may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed...

UBUNTU-CVE-2025-31498

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers when processanswer may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed...

CVE-2025-31498

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers when processanswer may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed...

CVE-2025-31498 c-ares has a use-after-free in read_answers()

c-ares is an asynchronous resolver library. From 1.32.3 through 1.34.4, there is a use-after-free in readanswers when processanswer may re-enqueue a query either due to a DNS Cookie Failure or when the upstream server does not properly support EDNS, or possibly on TCP queries if the remote closed...