CVE-2026-56854: Source-address critical option not enforced for non-public-key auth callbacks in golang.org/x/crypto/ssh
golang.org/x/crypto · golang.org/x/crypto/ssh
Vendor fix available · Affected: golang.org/x/crypto/ssh · Exploitation: unlikely (under 1%)
Not in CyberSIXT coverage yet: no article names this CVE. This page shows the public record.
Higher than 38% of scored CVEs
DescriptionCVE.org
The source-address critical option in the Permissions returned by an authentication callback was only enforced for the PublicKeyCallback and VerifiedPublicKeyCallback paths, extending the fix for CVE-2026-46595. Permissions returned by the PasswordCallback, KeyboardInteractiveCallback, NoClientAuthCallback, and GSSAPIWithMICConfig.AllowLogin callbacks were not validated against the client's remote address, so a source-address restriction set by those callbacks was silently ignored. The check is now applied to the Permissions returned by any authentication callback.
Affected products1
From the CVE record. A product or version that is not listed is unknown, not unaffected.
- golang.org/x/crypto · golang.org/x/crypto/sshbefore 0.55.0
On the Atlas
Every published CVE is on the CyberSIXT Atlas, grouped by weakness, vendor and month.
- Exploitation
- Unlikely (under 1%). EPSS under 1%, or no score yet.
- CISA KEV
- Not listed
- Public check
- No public nuclei template
- Vendor
- golang.org/x/crypto
- Published
- August 2026
CoverageNo articles yet
No CyberSIXT article names CVE-2026-56854 yet, so there is no coverage timeline, action brief or change log for it. Everything on this page comes from the public CVE record, CISA KEV, EPSS and the nuclei template index. Search the archive or see the CVEs in the news.