CVE-2026-39828

Summary

golang.org/x/crypto/ssh vulnerable to invoking bypass of certificate restrictions

Severity

medium

CVSS

6.3

EPSS

0.4% (p30)

CWE

CWE-295

Also known as

GHSA-45gg-vh54-h5m9, GO-2026-5014

Published

2026-06-25

Updated

2026-06-25

Advisory details

When an SSH server authentication callback returned PartialSuccessError with non-nil Permissions, those permissions were silently discarded, potentially dropping certificate restrictions such as force-command after a second factor succeeded. Returning non-nil Permissions with PartialSuccessError now results in a connection error.

References

• https://github.com/advisories/GHSA-45gg-vh54-h5m9
• https://nvd.nist.gov/vuln/detail/CVE-2026-39828
• https://go.dev/cl/781621
• https://go.dev/issue/79562
• https://groups.google.com/g/golang-announce/c/a082jnz-LvI
• https://pkg.go.dev/vuln/GO-2026-5014

Related advisories

• CVE-2026-39835 — medium · Go/golang.org/x/crypto/ssh
• CVE-2026-46595 — critical · Go/golang.org/x/crypto/ssh
• CVE-2026-39834 — critical · Go/golang.org/x/crypto/ssh
• CVE-2026-39831 — critical · Go/golang.org/x/crypto/ssh
• CVE-2026-39830 — critical · Go/golang.org/x/crypto/ssh
• CVE-2026-39829 — high · Go/golang.org/x/crypto/ssh
• CVE-2026-46597 — high · Go/golang.org/x/crypto/ssh
• CVE-2026-39827 — medium · Go/golang.org/x/crypto/ssh

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