Unbound vulnerabilities: known CVEs & security history
NLnet Labs · DNS · 41 tracked CVEs · 0 actively exploited · updated June 2026 · what is a CVE? →
This is the full list of known vulnerabilities (CVEs) across all Unbound release lines — 41 in total. A CVE here doesn't mean your version is affected — check Unbound's current status and the safe version to run.
Known Unbound CVEs
Actively-exploited and most-severe first. Open any CVE for full details.
| CVE | Severity | CVSS | EPSS | Year |
|---|---|---|---|---|
| CVE-2026-42960 | critical | 10 | 0% | 2026 |
| CVE-2026-33278 | critical | 9.8 | 1% | 2026 |
| CVE-2019-25042 | critical | 9.8 | 2% | 2021 |
| CVE-2019-25039 | critical | 9.8 | 2% | 2021 |
| CVE-2019-25038 | critical | 9.8 | 2% | 2021 |
| CVE-2019-25035 | critical | 9.8 | 2% | 2021 |
| CVE-2019-25034 | critical | 9.8 | 2% | 2021 |
| CVE-2019-25033 | critical | 9.8 | 2% | 2021 |
| CVE-2019-25032 | critical | 9.8 | 2% | 2021 |
| CVE-2026-42959 | high | 7.5 | 1% | 2026 |
| CVE-2026-42944 | high | 7.5 | 1% | 2026 |
| CVE-2026-41292 | high | 7.5 | 0% | 2026 |
| CVE-2026-40622 | high | 7.5 | 0% | 2026 |
| CVE-2024-1931 | high | 7.5 | 3% | 2024 |
| CVE-2023-50387 | high | 7.5 | 100% | 2024 |
| CVE-2022-3204 | high | 7.5 | 1% | 2022 |
| CVE-2019-25041 | high | 7.5 | 2% | 2021 |
| CVE-2019-25040 | high | 7.5 | 2% | 2021 |
| CVE-2019-25037 | high | 7.5 | 2% | 2021 |
| CVE-2019-25036 | high | 7.5 | 2% | 2021 |
| CVE-2020-10772 | high | 7.5 | 1% | 2020 |
| CVE-2020-12663 | high | 7.5 | 4% | 2020 |
| CVE-2020-12662 | high | 7.5 | 3% | 2020 |
| CVE-2019-16866 | high | 7.5 | 4% | 2019 |
| CVE-2009-3602 | high | 7.5 | 3% | 2009 |
| CVE-2019-18934 | high | 7.3 | 3% | 2019 |
| CVE-2022-30699 | medium | 6.5 | 1% | 2022 |
| CVE-2022-30698 | medium | 6.5 | 1% | 2022 |
| CVE-2026-44608 | medium | 5.9 | 0% | 2026 |
| CVE-2019-25031 | medium | 5.9 | 1% | 2021 |
| CVE-2020-28935 | medium | 5.5 | 0% | 2020 |
| CVE-2026-44390 | medium | 5.3 | 0% | 2026 |
| CVE-2026-42923 | medium | 5.3 | 0% | 2026 |
| CVE-2026-42534 | medium | 5.3 | 0% | 2026 |
| CVE-2026-32792 | medium | 5.3 | 0% | 2026 |
| CVE-2024-8508 | medium | 5.3 | 1% | 2024 |
| CVE-2017-15105 | medium | 5.3 | 3% | 2018 |
| CVE-2009-4008 | medium | 5 | 3% | 2011 |
| CVE-2010-0969 | medium | 5 | 3% | 2010 |
| CVE-2014-8602 | medium | 4.3 | 25% | 2014 |
| CVE-2011-1922 | medium | 4.3 | 7% | 2011 |
Is my Unbound version affected?
The list above spans every release. To know whether your version is affected — and the minimum safe version to upgrade to — check it directly.
Check your Unbound version → · Monitor Unbound for new CVEs →
Unbound vulnerabilities — frequently asked
How many known vulnerabilities does Unbound have?
IsItPatched tracks 41 CVEs for Unbound. 9 are critical-severity and 17 high-severity. These span every release line — what matters is whether the version you run is affected.
Does Unbound have any actively-exploited vulnerabilities?
None of Unbound's tracked CVEs are currently in CISA's KEV catalog — but new ones can be added at any time, so keep your version current.
What is the most severe Unbound vulnerability?
Among tracked issues, CVE-2026-42960 (CRITICAL, CVSS 10) ranks highest — a CWE-349 weakness.
Is Unbound safe to use?
It depends on the version. The latest supported Unbound release clears the known issues; older versions may still be affected. Check the exact version you run for a verdict.
CVE data aggregated from NVD, CISA KEV and EPSS (FIRST.org). Related: Unbound security status · Unbound end-of-life · actively-exploited CVEs. Always verify against NLnet Labs's advisories — see our disclaimer.