CVE-2026-39828

Description

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.

PUBLISHED Reserved 2026-04-07 | Published 2026-05-22 | Updated 2026-05-22 | Assigner Go

Problem types

CWE-863: Incorrect Authorization

Product status

Credits

NCC Group Cryptography Services, sponsored by Teleport

References

go.dev/issue/79562

groups.google.com/g/golang-announce/c/a082jnz-LvI

go.dev/cl/781621

pkg.go.dev/vuln/GO-2026-5014

cve.org (CVE-2026-39828)

nvd.nist.gov (CVE-2026-39828)

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