CVE-2026-12245
NSD 4.13.0 heap UAF in TLS error logging; crash via DoT DNS query.
Is CVE-2026-12245 being exploited?
Not confirmed. CVE-2026-12245 does not appear in CISA's Known Exploited Vulnerabilities catalog, which records only exploitation that has been observed and reported publicly. That is evidence of absence of a report, not evidence the flaw is unattacked. EPSS currently estimates a 0.32% probability of exploitation in the next 30 days.
How severe is CVE-2026-12245?
CVE-2026-12245 is rated High with a CVSS score of 8.7. Severity describes how bad exploitation would be, not how likely it is: pair it with exploitation evidence before deciding what to patch first.
Is there a patch for CVE-2026-12245?
Yes. A fix has been recorded for CVE-2026-12245. The vendor advisory is the authority on the exact fixed version — apply it from there rather than from a summary.
What does CVE-2026-12245 affect?
CVE-2026-12245 affects NSD DNS server 4.13.0+, DNS infrastructure deployments. Confirm the exact affected versions against the vendor advisory before deciding you are exposed.
What should I do about CVE-2026-12245?
Apply vendor patch when available; review DoT exposure.
Exploitation status reflects CISA's KEV catalog as we last synced it. Check the catalog directly.
Remote crash of NSD server via DoT DNS query; potential DoS and memory corruption.
Patch when possible
- affected>= 4.13.0 and < 4.14.3
As published in the CVE Program record. A version outside these ranges is not a statement that it is unaffected — vendors sometimes understate a range, and distribution-backported builds carry upstream numbers that do not reflect what was patched into them.