CVE-2026-46595: Invoking VerifiedPublicKeyCallback permissions skip enforcement in golang.org/x/crypto/ssh

Severity: critical (CVSS 10.0 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.6% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-05-22 · updated 2026-09-11
Weakness: CWE-863

Description

Previously, CVE-2024-45337 fixed an authorization bypass for misused ssh server configurations; if any other type of callback is passed other than public key, then the source-address validation would be skipped.

Affected products

golang.org/x/crypto/ssh: before 0.52.0 — fixed in 0.52.0
Golang.Org/X/Crypto: before 0.52.0 — fixed in 0.52.0

How to fix

Upgrade to a fixed version: golang.org/x/crypto/ssh 0.52.0; Golang.Org/X/Crypto 0.52.0. Check the vendor advisory for mitigations.

References

https://go.dev/cl/781642
https://go.dev/issue/79570
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
https://pkg.go.dev/vuln/GO-2026-5023
https://access.redhat.com/errata/RHSA-2026:23262
https://access.redhat.com/errata/RHSA-2026:23264
https://access.redhat.com/errata/RHSA-2026:26546
https://access.redhat.com/errata/RHSA-2026:26547
https://access.redhat.com/errata/RHSA-2026:30650
https://access.redhat.com/errata/RHSA-2026:30651
https://access.redhat.com/errata/RHSA-2026:33524
https://access.redhat.com/errata/RHSA-2026:33531

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