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Medium 2 vendors · 2 advisories

CVE-2026-121541: Bake filesystem path entitlements approval can be skipped in some multi-target builds

CVE-2026-121541 key facts

CISA KEV
Not listed (catalogue checked )
Highest advisory rating
Medium
CVSS base score
5.6 (Docker), 5.5 (Red Hat)
CVSS 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 · base score 5.6, scored by DockerAttack vector: local. Attack complexity: low. Attack requirements: present. Privileges required: none. User interaction: active. Confidentiality impact on the vulnerable system: high. Integrity impact on the vulnerable system: none. Availability impact on the vulnerable system: none. Confidentiality impact on subsequent systems: none. Integrity impact on subsequent systems: none. Availability impact on subsequent systems: none.
Weakness
  • CWE-863: Incorrect Authorization
CISA SSVC
Exploitation: none observed. Automatable: no. Technical impact: partial. CISA, .
Fixed releases
  • Docker: 0.38.1
  • Red Hat: 38.1
Vendor advisories
2 from Docker, Red Hat
Assigned by
Docker (CNA)
CVE record published
Listed by VulniPulse
Record changed

Ratings, versions and fixes are quoted from the vendor advisories that cover only CVE-2026-121541; each belongs to its advisory, not to every product listed. How records are collected and checked.

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.

Text from the CVE.org record (Docker).

How do I fix CVE-2026-121541?

Upgrade to a fixed release named by the vendor:

  • Docker: 0.38.1
  • Red Hat: 38.1
  • Run only trusted Bake definitions and upgrade Docker Buildx to v0.38.1 or later. For rhceph/alloy-rhel10, exposure is limited to the vendored buildx v0.23.0 library; the container neither ships the Buildx client nor invokes Bake multi-target builds. (Red Hat)
  • Upgrade Docker Buildx to v0.38.1 or later. (CVE.org record)
  • Workaround: Run only trusted Bake definitions until upgrading. Check that Bake definitions do not contain suspicious paths outside trusted directories. (CVE.org record)

Vendor advisories for CVE-2026-121541

Docker

1 advisory

Red Hat

1 advisory
  • Advisory severityMedium5.5

    Medium [CVE-2026-121541] Information disclosure via untrusted multi-target Bake definitions

    CVE-2026-121541Source published Source updated

    Information disclosure via untrusted multi-target Bake definitions. Red Hat rates this moderate (CVSS 5.5). Weakness: CWE-552. Affected product named by the advisory: Red Hat Ceph Storage 9.

    Related products — impact not confirmed
    • Red Hat Ceph Storage 9
    Source-reported affected versions
    • 19.0
    • 38.0
    Source-reported fixed versions
    • 38.1
    Mitigation guidance
    • Run only trusted Bake definitions and upgrade Docker Buildx to v0.38.1 or later. For rhceph/alloy-rhel10, exposure is limited to the vendored buildx v0.23.0 library; the container neither ships the Buildx client nor invokes Bake multi-target builds.
    Full advisory and evidenceOpen source bulletin

References

Timeline

  1. CVE record published
  2. First vendor advisory listed by VulniPulse
  3. CVE record last updated

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