NLnet Labs has 17 CVEs on record. Disclosure cadence is accelerating: 16 in the last 90 days against 1 in the 90 before. The busiest recent month was October 2026 with 16. The median CVSS is 7.5 (high). None have a confirmed exploitation report. The dominant weakness classes are CWE-755 (7) and CWE-121 (4). Most affected products: Routinator (7), Unbound (6), NSD (4).
CVEs per month
Last 12 months, by publish date
- Exploited share
- 0% vs 1% corpus
- Median CVSS
- 7.5
- Publish → KEV
- —
- Last 90 days
- 16 prev 1
Worst active — by depth score
CVE-2026-97206High· 7.5DNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.53CVE-2026-101341High· 8.7Tokens of text in RDATA (of for example TXT records) under 32 bytes are not checked to stay within the space reserved for the RDATA allowing for arbitrary sized out of bound stack writes, including an overwrite of a callback function poi…48CVE-2026-101339High· 8.7A HIP resource record that fills the RDATA near or at is limit, and has another dname RDATA field (a HIP Rendezvous server) can overwrite the stack with up to 191 bytes of attacker controlled data48CVE-2026-101338High· 8.7When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data of unlimited size48CVE-2026-101337High· 8.7When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes48
NLnet Labs vulnerabilities
CVEs affecting NLnet Labs, newest first. Open any entry for full detail, references, and exploit status.
17 CVEsRSS
CVE-2026-72755Low· 3.8Routinator stores TA certificate in cache without validation
Routinator stores a newly-retrieved TA certificate via HTTPS in cache without validation, potentially overwriting a known good TA certificate even if validation fails.
CVE-2026-72753High· 8.2Routinator incorrectly handles delta updates
When Routinator encounters an RRDP notification file with gaps in the delta entries, it is still accepted and parsed, potentially leading to missing data. If it encounters too many delta entries it may run out of memory.
CVE-2026-72756High· 7.5Routinator exits on malformed rsync URIs
Routinator exits when an rsync URI for a file obtained over RRDP contains a path that cannot be stored on disk, such as too long file names, and folder names that overlap with existing file names.
CVE-2026-72754High· 7.5Routinator exits when parsing an incorrect or very large CRL file
When Routinator encounters a CRL with many entries, it may hang or run out of memory. If Routinator encounters a CRL file with the wrong encoding, it may exit.
CVE-2026-72752Medium· 6.5Routinator exits when requesting the output repeatedly
Routinator runs out of memory when the JSON output is requested many times concurrently. This condition can be triggered maliciously by an attacker by opening a large number of connections to the HTTP server. Additionally Routinator runs…
CVE-2026-72757Medium· 5.3Routinator HTTP server becomes unavailable with many unclosed connections
Routinator runs out of open connections on the HTTP server when many connections are opened but never closed, leaving the HTTP server unavailable. This condition can be triggered maliciously by an attacker by opening a large number of co…
CVE-2026-72758High· 7.5Routinator may exit on malformed ranges
When parsing an AS range in Routinator, if the maximum value of the range is smaller than the minimum value of the range, Routinator will never reach the maximum value and run out of memory.
CVE-2026-96405Medium· 5.3Aggregate DNS name chained pointer decompression work leads to degradation of service.
NLnet Labs Unbound up to and including version 1.26.1 limits compression-pointer traversal for each individual domain-name operation but has no aggregate inbound decompression-work budget. Many chained compression pointers in a message r…
CVE-2026-109125Medium· 5.3Possible cache poisoning vulnerability via a cache side-channel exposed by 'unwanted-reply-threshold'
In NLnet Labs Unbound up to and including version 1.26.1, an observable cache-level side-channel can be exposed with 'unwanted-reply-threshold > 0' configurations (not a default configuration). If a response-like UDP datagram reaches th…
CVE-2026-50106Medium· 6.5Possible insecure NXDOMAIN for non-existing records under a configured island trust anchor underneath an insecure parent.
When NLnet Labs Unbound up to and including version 1.26.1 is configured with both a root trust anchor and an additional 'trust-anchor:' for an island-of-security zone whose parent is provably insecure under the root chain, a malicious a…
CVE-2026-35501Low· 3.7Bypass of a configured island trust anchor underneath an insecure parent from an atacker-controlled NSEC record.
When NLnet Labs Unbound 1.0.1 up to and including version 1.26.1 is configured with both a root trust anchor and an additional 'trust-anchor:' for an island-of-security zone whose parent is provably insecure under the root chain, a malic…
CVE-2026-97206High· 7.5PoCDNS-over-QUIC (DoQ) path-migration can lead to use-after-free on multi-threaded deployments.
NLnet Labs Unbound, 1.22.0 up to and including version 1.26.1, contains a DNS-over-QUIC (DoQ) lifetime bug reachable by a remote DoQ client under multi-threaded operation. A client-triggered QUIC path migration can enter stream/connectio…
CVE-2026-101341High· 8.7Tokens of text in RDATA (of for example TXT records) under 32 bytes are not checked to stay within the space reserved for the RDATA allowing for arbitrary sized out of bound stack writes, including an overwrite of a callback function poi…
Tokens of text in RDATA (of for example TXT records) under 32 bytes are not checked to stay within the space reserved for the RDATA allowing for arbitrary sized out of bound stack writes, including an overwrite of a callback function poi…
CVE-2026-101339High· 8.7A HIP resource record that fills the RDATA near or at is limit, and has another dname RDATA field (a HIP Rendezvous server) can overwrite the stack with up to 191 bytes of attacker controlled data
A HIP resource record that fills the RDATA near or at is limit, and has another dname RDATA field (a HIP Rendezvous server) can overwrite the stack with up to 191 bytes of attacker controlled data. Zone files which are written out by NS…
CVE-2026-101338High· 8.7When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data of unlimited size
When a SVCB or HTTPS RR has filled the wire format RDATA up to the brim, another ECH parameter may overwrite the stack, and once beyond the limit, the base64 decoder can write attacker controlled data of unlimited size. Zone files which…
CVE-2026-101337High· 8.7When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes
When base64 data is split up in pieces, of 3 character or less, tokens were incorrectly calculated to produce 0 bytes. This enables attackers to overwrite the stack with up to 64K of attacker controlled data. Zone files which are writte…
CVE-2026-55991Medium· 5.9Remote DNS-over-QUIC (DoQ) flow-control assertion failure in libngtcp2
In NLnet Labs Unbound 1.22.0 up to and including 1.25.1, a remote unauthenticated client can trigger a libngtcp2 assertion (if compiled with assertions on) and terminate the entire Unbound process using a single DNS-over-QUIC (DoQ) conne…