CVE-2025-66221
unknown
CVSS v3
—
CVSS v4 NEW
—
VIR risk
—
Description
Werkzeug safe_join() allows Windows special device names
Predictions
Exploit likelihood
20%
Patch ETA
—
Heuristic predictions, AS-IS, for prioritization only.
Mitigations
No mitigations published for this CVE yet.
The vendor-content worker queues fetches as references arrive (check back in a few minutes). Or — if you've already worked around this in production — publish your fix to the community-verified tier.
✚ Propose a mitigation on Community → Mitigations published via the community go through AI scoring + 2 human reviewers + 7-day silent objection window before landing here withsource_tier=community-verified.
OS impact
| OS | Version | Status | Fixed in |
|---|---|---|---|
| debian | bookworm | fixed | 0 |
| debian | bullseye | fixed | 0 |
| debian | forky | fixed | 0 |
| debian | sid | fixed | 0 |
| debian | trixie | fixed | 0 |
Package impact
| Ecosystem | Package | Vulnerable | Fixed |
|---|---|---|---|
| PyPI | werkzeug | <3.1.4 | 3.1.4 |
References
- https://github.com/pallets/werkzeug/security/advisories/GHSA-hgf8-39gv-g3f2
- https://nvd.nist.gov/vuln/detail/CVE-2025-66221
- https://github.com/pallets/werkzeug/commit/4b833376a45c323a189cd11d2362bcffdb1c0c13
- https://github.com/pallets/werkzeug
- https://github.com/pallets/werkzeug/releases/tag/3.1.4
- https://security-tracker.debian.org/tracker/CVE-2025-66221
Community-verified mitigations for this CVE will appear above when contributors publish them.
Verify integrity in audit chain (admin only). AS-IS.