EUVD-2026-39512Published

K3s: ZIP Archive Path Traversal Vulnerability in etcd Snapshot Decompression

Collected exploitation and prediction evidence

CISA KEV is observed exploitation evidence. FIRST EPSS is a dated prediction of exploitation in the next 30 days. Missing scores are unknown. This collector requests predictions only for explicit CVE aliases in the public NuGet archive; Microsoft release views retain their existing prediction scope.

No collected risk observation for these identifiers. This does not establish absence of exploitation or a zero probability.

cve-program · CVE-2026-54250

Published

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.

Source published: 25 Jun 2026 17:56:56 UTC
Source modified: 26 Jun 2026 18:42:33 UTC
Observed here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 5.8 CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H

euvd · EUVD-2026-39512

Published

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

Original publisher date fields

datePublished: Jun 25, 2026, 5:56:56 PM

dateUpdated: Jun 26, 2026, 6:42:33 PM

Source published: Jun 25, 2026, 5:56:56 PM (timezone not stated)
Source modified: Jun 26, 2026, 6:42:33 PM (timezone not stated)
Observed here: 7 Nov 2026 12:28:51 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 5.8 CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H

nvd · CVE-2026-54250

Published

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Awaiting Analysis

Weakness classifications: CWE-22

Original publisher date fields

published: 2026-06-25T19:16:41.983

lastModified: 2026-10-25T22:10:00.150

Source published: 25 Jun 2026 19:16:41 UTC
Source modified: 25 Oct 2026 22:10:00 UTC
Observed here: 27 Oct 2026 14:13:29 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 5.8 CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H

osv · GHSA-jxr7-mqhw-9p98

Published

#### Summary 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. #### Mitigations * Enable golang's built-in [insecure path protections](https://pkg.go.dev/archive/zip#NewReader) when restoring snapshots by setting the`GODEBUG` environment variable: ```bash GODEBUG=zipinsecurepath=0 k3s server --cluster-reset --cluster-reset-restore-path=/path/to/snapshot.zip ``` * Manually extract the snapshot from the zip archive before restoring it. If the snapshot to be restored does not end with `.zip`, the vulnerable extraction code will not be executed. #### Additional Notes Administrators should be aware of the cautions noted in the "Security" section of the documentation on [Restoring Snapshots](https://docs.k3s.io/cli/etcd-snapshot#security).

Source published: 14 Jul 2026 17:54:14 UTC
Source modified: 10 Sep 2026 03:50:52 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:H/UI:R/S:U/C:N/I:H/A:H

Publisher rating · MODERATE

osv · GO-2026-5973

Published

K3s: ZIP Archive Path Traversal Vulnerability in etcd Snapshot Decompression in github.com/k3s-io/k3s. NOTE: The source advisory for this report contains additional versions that could not be automatically mapped to standard Go module versions. (If this is causing false-positive reports from vulnerability scanners, please suggest an edit to the report.) The additional affected modules and versions are: github.com/k3s-io/k3s before v1.33.10, from v1.34.0-rc1 before v1.34.6, from v1.35.0-rc1 before v1.35.3.

Source published: 17 Jul 2026 19:42:05 UTC
Source modified: 28 Jul 2026 21:00:01 UTC
Observed here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

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This view projects the publisher's source fields for reading; the original JSON retains additional fields and CVE enrichment containers. Attribution: osv · OSV · upstream source license applies. Source text is retained; field grouping and change labels are provided by ChangeIntel.