CVE-2026-122458.7HighCWE-416
CVE-2026-12245: NLnet Labs NSD vulnerability
NLnet Labs · NSD
Vendor fix available · Affected: NLnet Labs NSD · Exploitation: not established
ExploitationNot established
Not in CISA KEV as of catalogue 2026.11.13 (13 Nov)
- In CISA KEV: not seen
- Exploited (reported): not seen
- Scanning observed: not seen
- Proof of concept public: not seen
- Not establishedNothing in the sources we check
0.5%probability of exploitation in the next 30 days
40th percentile
050100
Higher than 40% of scored CVEs
8.7HighCVSS 4.0
LowMediumHighCrit.
DescriptionNVD
NSD from version 4.13.0 has a heap use-after-free bug in logging errors on TLS connections, causing a crash of the server process, which can be triggered trivially by sending a DNS query over a DoT connection, and closing the connection without reading the response.
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- NLnet Labs
- Published
- June 2026
Coverage1 article · 1 outlet
First in our coverage: SecurityOnline, 30 Jun.
- NLnet Labs fixes critical NSD DNS server flaws in new releaseSecurityOnline · first in our coverage · mentions it in passing
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