Technology · NLnet Labs
NLnet Labs Unbound vulnerabilities
Updated . Rebuilt every hour.
Junglewise Threat Intelligence has tracked 46 vulnerabilities in NLnet Labs Unbound: 0 in the last 7 days and 11 in the last 90 days, 2 of them critical and 0 exploited in the wild. The most recent, CVE-2026-97206, was published on 21 October 2026. 4 vulnerabilities in the last four weeks, down 43% on the four before (7). 0 critical against 2.
- Last 7 days
- 0
- Last 90 days
- 11
- Critical, all time
- 2
- Exploited in the wild
- 0
About NLnet Labs Unbound
Unbound is a validating, recursive, caching DNS resolver designed for high performance and security.
Latest NLnet Labs Unbound vulnerabilities
- CVE-2026-97206: NLnet Labs Unbound use-after-free in DNS-over-QUIC stream cleanuphighCVSS 7.5
- CVE-2026-96405: NLnet Labs Unbound DNS decompression CPU exhaustionmediumCVSS 5.3
- CVE-2026-50106: NLnet Labs Unbound DNS validator bypass in DNSSEC validationmediumCVSS 6.5
- CVE-2026-109125: NLnet Labs Unbound cache side-channel in upstream source port probemediumCVSS 5.3
- CVE-2026-85501: NLnet Labs Unbound DNS complexity attacks via ReTrapmediumCVSS 5.3EPSS 0.5%
- CVE-2026-82720: NLnet Labs Unbound use-after-free in DNS-over-HTTPsmediumCVSS 5.9EPSS 0.4%
- CVE-2026-82717: NLnet Labs Unbound heap buffer overflow in CNAME synthesiscriticalCVSS 9.8EPSS 0.8%
- CVE-2026-81642: NLnet Labs Unbound DNSSEC validator buffer overflowcriticalCVSS 9.8EPSS 1.0%
- CVE-2026-81634: NLnet Labs Unbound heap buffer overflow in RRSet canonicalisationhighCVSS 7.5EPSS 0.5%
- CVE-2026-78227: NLnet Labs Unbound use-after-free in DNS-over-QUICmediumCVSS 6.5EPSS 0.3%
- CVE-2026-77955: NLnet Labs Unbound ZONEMD check bypass in delegated zonesmediumCVSS 4.4EPSS 0.2%
- CVE-2026-56444: NLnet Labs Unbound resource exhaustion in serve-expired logicmediumCVSS 5.9
- CVE-2026-56416: NLnet Labs Unbound heap buffer overflow in DNSSEC validatormediumCVSS 4.8
- CVE-2026-55991: NLnet Labs Unbound denial of service in DNS-over-QUICmediumCVSS 5.9
- CVE-2026-55990: NLnet Labs Unbound denial of service in DNSCryptmediumCVSS 5.9
- CVE-2026-55973: NLnet Labs Unbound stack overflow in DNS error reportinghighCVSS 7.5
- CVE-2026-55717: NLnet Labs Unbound DoS via NULL pointer dereference in serve-expired-client-timeoutmediumCVSS 5.9
- CVE-2026-55708: NLnet Labs Unbound insecure default initialization in unbound-controllowCVSS 3.1
- CVE-2026-54478: NLnet Labs Unbound DNS Cookie authentication bypass in PROXYv2lowCVSS 3.7
- CVE-2026-52863: NLnet Labs Unbound use-after-free in respip and dns64 modulesmediumCVSS 5.9
- CVE-2026-50252: NLnet Labs Unbound DNS cache poisoning via predictable UDP source portsinfoCVSS 5.7
- CVE-2026-50251: NLnet Labs Unbound cache flush via 0.0.0.0 glue recordsmediumCVSS 5.3
- CVE-2026-50248: NLnet Labs Unbound insufficient verification of XFR endpoints in RPZ zonesmediumCVSS 6.5
- CVE-2026-50243: NLnet Labs Unbound DNSSEC validation bypass in respip moduleinfoCVSS 6.3
- CVE-2026-50046: NLnet Labs Unbound use-after-free in DNS-over-TLS forwardingmediumCVSS 5.9
Most severe NLnet Labs Unbound vulnerabilities
Exploited in the wild first, then by severity and CVSS score.
- CVE-2026-81642: NLnet Labs Unbound DNSSEC validator buffer overflowcriticalCVSS 9.8EPSS 1.0%
- CVE-2026-82717: NLnet Labs Unbound heap buffer overflow in CNAME synthesiscriticalCVSS 9.8EPSS 0.8%
- CVE-2026-81634: NLnet Labs Unbound heap buffer overflow in RRSet canonicalisationhighCVSS 7.5EPSS 0.5%
- CVE-2026-97206: NLnet Labs Unbound use-after-free in DNS-over-QUIC stream cleanuphighCVSS 7.5
- CVE-2026-55973: NLnet Labs Unbound stack overflow in DNS error reportinghighCVSS 7.5
- CVE-2026-44690: NLnet Labs Unbound cache poisoning via aggressive NSEC processinghighCVSS 7.5
- CVE-2026-40691: NLnet Labs Unbound heap overflow in DNSCrypt TCP handlerhighCVSS 7.5
- CVE-2026-32665: NLnet Labs Unbound denial of service in DNS-over-QUIChighCVSS 7.5
- CVE-2026-78227: NLnet Labs Unbound use-after-free in DNS-over-QUICmediumCVSS 6.5EPSS 0.3%
- CVE-2026-50106: NLnet Labs Unbound DNS validator bypass in DNSSEC validationmediumCVSS 6.5
Vulnerabilities per week
4 vulnerabilities in the last four weeks, down 43% on the four before (7). 0 critical against 2. The last 13 weeks, by the week each vulnerability was published.
| Week of | Bar | Vulns | Critical |
|---|---|---|---|
| 17 Aug 2026 | 0 | 0 | |
| 24 Aug 2026 | 0 | 0 | |
| 31 Aug 2026 | 0 | 0 | |
| 7 Sep 2026 | 0 | 0 | |
| 14 Sep 2026 | 7 | 2 | |
| 21 Sep 2026 | 0 | 0 | |
| 28 Sep 2026 | 0 | 0 | |
| 5 Oct 2026 | 0 | 0 | |
| 12 Oct 2026 | 0 | 0 | |
| 19 Oct 2026 | 4 | 0 | |
| 26 Oct 2026 | 0 | 0 | |
| 2 Nov 2026 | 0 | 0 | |
| 9 Nov 2026 | 0 | 0 |
Embed a badge
A live badge for a README, a status page or an internal wiki: how many NLnet Labs Unbound vulnerabilities were published in the last 7 days and how many of them are critical, refreshed hourly.
[](https://junglewise.ai/threats/technologies/unbound)<a href="https://junglewise.ai/threats/technologies/unbound"><img src="https://junglewise.ai/threats/technologies/unbound/badge.svg" alt="NLnet Labs Unbound vulnerabilities" /></a>How this is built
Junglewise Threat Intelligence collects vulnerabilities from NVD, GitHub Security Advisories, OSV, the CISA Known Exploited Vulnerabilities catalog, FIRST EPSS and vendor advisories, and matches each one to the technologies and vendors it affects. Dates are the date a vulnerability was published, in UTC.
The pages are rebuilt from the database every hour. Frozen weekly and monthly reports never change once published, so they can be cited.
Use this data
The same data is at https://junglewise.ai/threats/technologies/unbound.json, and this page as text at https://junglewise.ai/threats/technologies/unbound.md, for scripts and language models. It is free to reuse under CC BY 4.0 with a link back to this page.
Cite as: Junglewise Threat Intelligence, "NLnet Labs Unbound vulnerabilities", https://junglewise.ai/threats/technologies/unbound, 9 November 2026.