K3s: ZIP Archive Path Traversal Vulnerability in etcd Snapshot Decompression

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Summary

CVECVE-2026-54250
StatePUBLISHED
AssignerGitHub_M
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-25 19:16:41 UTC
Updated2026-06-25 19:59:59 UTC
DescriptionK3s is a fully conformant production-ready Kubernetes distribution. Prior to 1.35.3+k3s1, 1.34.6+k3s1, v1.33.10+k3s1, a path traversal vulnerability exists in K3s's etcd snapshot decompression functionality. Zip files containing archive members with maliciously crafted names can be written to arbitrary locations on the filesystem when an administrator restores the archive as a compressed etcd snapshot. This vulnerability is fixed in 1.35.3+k3s1, 1.34.6+k3s1, v1.33.10+k3s1.

Risk And Classification

Primary CVSS: v3.1 5.8 MEDIUM from [email protected]

CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H

Problem Types: CWE-22 | CWE-22 CWE-22: Improper Limitation of a Pathname to a Restricted Directory ('Path Traversal')

VersionSourceTypeScoreSeverityVector
3.1[email protected]Secondary5.8MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H
3.1CNADECLARED5.8MEDIUMCVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
High
User Interaction
Required
Scope
Unchanged
Confidentiality
None
Integrity
High
Availability
High

CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA K3s-io K3s affected >= 1.35.0-rc1+k3s1, < 1.35.3+k3s1 Not specified
CNA K3s-io K3s affected >= 1.34.0-rc1+k3s1, < 1.34.6+k3s1 Not specified
CNA K3s-io K3s affected < 1.33.10+k3s1 Not specified

References

ReferenceSourceLinkTags
github.com/k3s-io/k3s/security/advisories/GHSA-jxr7-mqhw-9p98 [email protected] github.com
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