Microsoft security update for CVE-2026-121520 — azl3
🔗 CVE IDs covered (1)
📋 Microsoft's advisory
EchelonGraph does not copy Microsoft's advisory page: its FAQ and remediation text are not shown here. Read the advisory on https://msrc.microsoft.com/update-guide/vulnerability/CVE-2026-121520. This page also shows what EchelonGraph holds for CVE-2026-121520, with the description from its CVE record, which the CVE Numbering Authority that assigned the CVE wrote: for a CVE Microsoft assigned, often in the words of Microsoft's own advisory.
🎯 Affected products6
- azl3 docker-buildx 0.14.0-19 on Azure Linux 3.0
- azl3 docker-buildx 0.14.0-20 on Azure Linux 3.0
- azl3 docker-compose 2.27.0-16 on Azure Linux 3.0
- azl3 docker-compose 2.27.0-17 on Azure Linux 3.0
- azl3 moby-engine 25.0.18-1 on Azure Linux 3.0
- azl3 moby-engine 25.0.18-2 on Azure Linux 3.0
✅ Updates Microsoft lists: 1 update
1 row: one per KB article or update, update type and fixed build. Their details are on Microsoft's advisory.
| KB article | Update | Fixed build |
|---|---|---|
| — | Security Update | — |
🧭 EchelonGraph on CVE-2026-121520
- EchelonGraph score
- 4.5 MEDIUM
- CISA KEV
- Not listed
- Fix status
- A fix is available — apply it.
Description from the CVE record (CVE.org), as published by its numbering authority
In BuildKit versions prior to v0.34.1, a malicious client with access to the BuildKit control APIs can submit a build request that sets an extended attribute on a file outside the BuildKit state directory. Extended attributes in the trusted. or security. namespaces may also be set, potentially giving a program on the host elevated privileges. This issue affects build services that accept build requests from untrusted users. The issue is fixed in v0.34.1.
Published by Docker Inc., the CVE Numbering Authority that assigned CVE-2026-121520, in its CVE record at CVE.org; reused under the CVE Program's Terms of Use (its licence and MITRE's copyright notice are in our Terms of Service).