Microsoft security update for CVE-2026-123611 — 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-2026-123611. This page also shows what EchelonGraph holds for CVE-2026-123611, 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 kata-containers 4.1.0.kata1-2 on Azure Linux 3.0
- azl3 kata-containers-cc 3.15.0.aks0-23 on Azure Linux 3.0
- azl3 python-tensorboard 2.16.2-6 on Azure Linux 3.0
- azl3 rust 1.75.0-31 on Azure Linux 3.0
- azl3 rust 1.98.1-1 on Azure Linux 3.0
- azl3 rust-afterburn 5.8.2-2 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-2026-123611
- EchelonGraph score
- 3.7 LOW
- 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
rustls before 0.23.46 contains a key exchange downgrade vulnerability that allows network attackers to poison the per-server-name key-exchange group record via an unauthenticated ServerHello. Attackers can answer one connection with a ServerHello selecting X25519, causing later ClientHellos to send only classical shares and lose post-quantum confidentiality.
Published by VulnCheck, the CVE Numbering Authority that assigned CVE-2026-123611, 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).