CVE-2026-21860
MediumAdvisory
Published 8 Jan 2026In the index since 5 Sept 2026
- Severity
- Medium
- worst across findings
- CVSS
- 5.3
- base score, highest
- EPSS
- 0.005
- 40th percentile
- CISA KEV
- Not listed
- no confirmed exploitation
- Charts affected
- 307
- of 17,781 indexed, latest versions
- Container images
- 303
- deployed by those charts
- Fix available
- 1 of 1
- affected package
Werkzeug safe_join() allows Windows special device names with compound extensions
Carried by container images the latest versions of 307 of 17,781 indexed charts deploy, on 303 images.
| Affected package | Affected versions | Fixed in | Images |
|---|---|---|---|
| werkzeugpypi | 0.9.1, 0.11.15, 0.12.2, 0.13+33 more | 3.1.5 | 303 |
- OSV records
- GHSA-87hc-h4r5-73f7
- Also known as
- PYSEC-2026-2044
Charts affected
307 by stars
| Chart | Latest | Affected images | Radar Score |
|---|---|---|---|
| ambassadorwenerme | 6.9.5 | 1 of 2See more | 4,086 |
| emissary-ingresswenerme | 8.12.2 | 1 of 2See more | 10,843 |
| ceph-csi-cephfswikimedia | 0.1.8 | 1 of 5See more | 10,285 |
| ceph-csi-rbdwikimedia | 0.1.13 | 1 of 6See more | 11,784 |
| powerdnsadminwitcom-gmbh | 0.3.4 | 1 of 1See more | 2,643 |
| xkopsxkops | 0.1.0 | 1 of 5See more | 13,677 |
| zerossl-cert-managerzerossl-cert-manager | 0.1.0 | 1 of 2See more | 570 |
Container images carrying it
303 by charts deploying them
A fixed version is listed for 1 of the 1 affected package.
| Container image | Digest | Package | Fixed in | Used by |
|---|---|---|---|---|
| quay.io/ | d8f66f4117fe | werkzeug | 3.1.5 | 1 |
| quay.io/ | e0d9b93dbf2b | werkzeug | 3.1.5 | 1 |
| registry.gitlab.com/ | 4e7faf6f8d5f | werkzeug | 3.1.5 | 1 |