Machine-written summary
Summary written by Claude Haiku from the source advisory. Not reviewed by a person.
Netty's epoll transport (io.netty:netty-transport-classes-epoll) versions 4.2.0.Final up to 4.2.12.Final fail to close TCP connections that receive a reset after being half-closed. An unauthenticated remote attacker can repeat this to accumulate stale connections, exhausting file descriptors or memory, and in some code paths can cause a 100% CPU busy-loop on the event loop thread. Upgrade to 4.2.13.Final. As a workaround, configure idle timeouts on connections to limit how long stale channels persist.
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 |
|---|---|---|---|---|
| 7.5 | High | 3.1 | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H | CNA (GitHub_M) |
- CISA KEV Not listed.
- EPSS 0.0041, the 35th percentile, on 10 Nov 2026: FIRST’s estimate of the chance of exploitation in the next 30 days.
Timeline
- 31 Oct 2026, 14:17 UTC First seen by agentprime
- 31 Oct 2026, 14:17 UTC Confirmed by OSV