CRITICAL 9.1 Microsoft

CVE-2026-39830

Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

Microsoft Security Update 2026-May: Invoking client can cause server deadlock on unexpected responses in golang.org/x/crypto/ssh

Affected Products

azl3 cert-manager 1.12.15-6 on Azure Linux 3.0
azl3 cf-cli 8.7.11-5 on Azure Linux 3.0
azl3 docker-buildx 0.14.0-11 on Azure Linux 3.0
azl3 docker-compose 2.27.0-9 on Azure Linux 3.0
azl3 gh 2.62.0-15 on Azure Linux 3.0
azl3 kubernetes 1.30.10-23 on Azure Linux 3.0
azl3 kubevirt 1.7.1-2 on Azure Linux 3.0
azl3 moby-engine 25.0.3-17 on Azure Linux 3.0

References

Published: 2026-05-12 · Source: Microsoft · Feed updated: 2026-11-03

This critical severity vulnerability with a CVSS score of 9.1 was published on 2026-05-12 via Microsoft. Affected: azl3 cert-manager 1.12.15-6 on Azure Linux 3.0, azl3 cf-cli 8.7.11-5 on Azure Linux 3.0, azl3 docker-buildx 0.14.0-11 on Azure Linux 3.0 and 5 more.

Risk Timeline

CVE Disclosed2026-05-12 · 174 days ago

Remediation Resources

Official Advisory

msrc.microsoft.com/update-guide/vulnerability/CVE-2026-39830

NVD / MITRE

nvd.nist.gov/vuln/detail/CVE-2026-39830

Related Vulnerabilities

CVE	Title	Severity	CVSS
CVE-2026-110264	Integer Overflow or Wraparound in GitLab	CRITICAL	10.0
CVE-2026-94603	Podman: The `podman run` command can be instructed to disable almost all sandbox	CRITICAL	10.0
CVE-2026-39821	Invoking failure to reject ASCII-only Punycode-encoded labels in golang.org/x/ne	CRITICAL	10.0
CVE-2026-42960	Possible cache poisoning via promiscuous records for the authority section	CRITICAL	10.0
CVE-2026-46595	Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x	CRITICAL	10.0
CVE-2025-32433 PoC	Erlang/OTP SSH Vulnerable to Pre-Authentication RCE	CRITICAL	10.0

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