CVE-2026-56855 Affecting k3s-1.34 package, versions <1.34.11.1-r3
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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- published6 Sept 2026
- disclosed2 Sept 2026
Introduced: 2 Sep 2026
NewCVE-2026-56855 (opens in a new tab)How to fix?
Upgrade Wolfi k3s-1.34 to version 1.34.11.1-r3 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream k3s-1.34 package and not the k3s-1.34 package as distributed by Wolfi.
See How to fix? for Wolfi relevant fixed versions and status.
Previously, after a channel has been established, a malicious peer could send crafted messages that would deadlock the entire connection. Now, we handle all RFC 4254 channel messages; global requests are handled explicitly. Then, treat all other messages as a protocol error and tear the connection down instead of buffering and blocking.