CVE-2026-54250Medium· 5.8▾ SunlitK3s: ZIP Archive Path Traversal Vulnerability in etcd Snapshot Decompression
▾ Sunlit zone — Low / medium · no exploitation signal
impact 31.9 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Jul 30.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via GHSA
0.1%
0.1% → 0.2%
A path traversal vulnerability exists in K3s's etcd snapshot decompression functionality. Zip files containing archive members with maliciously crafted names (e.g., ../../../../etc/password) can be written to arbitrary locations on the filesystem when an administrator restores the archive as a compressed etcd snapshot.
GODEBUG environment variable:
GODEBUG=zipinsecurepath=0 k3s server --cluster-reset --cluster-reset-restore-path=/path/to/snapshot.zip
.zip, the vulnerable extraction code will not be executed.Administrators should be aware of the cautions noted in the "Security" section of the documentation on Restoring Snapshots.
github.com/k3s-io/k3s >= 1.35.0-rc1, < 1.35.3github.com/k3s-io/k3s >= 1.34.0-rc1, < 1.34.6github.com/k3s-io/k3s < 1.33.10Upgrade to a patched release:
github.com/k3s-io/k3s 1.35.3github.com/k3s-io/k3s 1.34.6github.com/k3s-io/k3s 1.33.10Connected by shared product, vendor, weakness, or advisory.
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