Vulnerability · Published Nov 3, 2026 · Assigned by Docker
CVE-2026-121541Bake filesystem path entitlements approval can be skipped in some multi-target builds
Medium 5.6
In plain English
A medium-severity incorrect authorization in Docker Buildx from Docker. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.1% (higher than 1% of all known vulnerabilities).
Official description
In Docker Buildx versions v0.19.0 through v0.38.0, an untrusted Bake definition that builds multiple targets together may expose files accessible to the Buildx client without the expected fs.read approval. Under certain conditions, filesystem paths from some targets are not verified against the approved entitlements. Users who run untrusted Bake definitions may be affected. The issue is fixed in v0.38.1.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian:13 | docker-buildx | no fix listed | DEBIAN-CVE-2026-121541 |
| Debian:14 | docker-buildx | no fix listed | DEBIAN-CVE-2026-121541 |
| Ubuntu:26.04:LTS | docker.io | no fix listed | UBUNTU-CVE-2026-121541 |
| Ubuntu:26.10 | docker.io | no fix listed | UBUNTU-CVE-2026-121541 |
| Ubuntu:26.04:LTS | docker.io-app | no fix listed | UBUNTU-CVE-2026-121541 |
| Ubuntu:26.10 | docker.io-app | no fix listed | UBUNTU-CVE-2026-121541 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| Docker | Docker Buildx | 0.19.0 – before 0.38.1 |
Weakness: CWE-863 · Vector: CVSS:4.0/AV:L/AC:L/AT:P/PR:N/UI:A/VC:H/VI:N/VA:N/SC:N/SI:N/SA:N