CVE-2026-78662 Affecting linkerd2-controller package, versions <26.8.4-r2
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-MINIMOSLATEST-LINKERD2CONTROLLER-19536921
- published5 Sept 2026
- disclosed2 Sept 2026
Introduced: 2 Sep 2026
NewCVE-2026-78662 (opens in a new tab)How to fix?
Upgrade Minimos:latest linkerd2-controller to version 26.8.4-r2 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream linkerd2-controller package and not the linkerd2-controller package as distributed by Minimos.
See How to fix? for Minimos:latest relevant fixed versions and status.
Previously, a channel registered in the mux's chanList is not usable until it is established. A malicious peer was able flood the channel's incomingRequests, deadlocking the entire connection. Now, we add an atomic established state, set when a channel becomes usable. Until such a time, handlePacket drops every packet other than the open confirmation/failure, without blocking and without tearing down the connection.