Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
CoreDNS versions 1.2.0 up to but not including 1.12.4 use the etcd plugin in a way that treats etcd lease IDs as TTL values, so records can receive very long TTLs. An attacker with write access to etcd can attach a lease to a record, causing downstream resolvers and clients to cache answers for a very long time, which can delay changes to services. Upgrade to CoreDNS 1.12.4 or later.
Not analysed yet
We haven’t published our analysis of this Advisory yet. Once a person has reviewed it, this page will say what’s vulnerable, what has to be true for your app to be affected, and how to check.
Severity and exploitation
| Score | Rating | CVSS | Vector | Source |
|---|---|---|---|---|
| 7.1 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0051, the 43rd percentile, on 5 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:14 UTC First seen by agentprime
- 31 Oct 2026, 14:14 UTC Confirmed by OSV