CVE-2026-39832

CRITICAL 9.1

Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent

CVSS Score

9.1

EPSS Score

0.0%

EPSS Percentile

4th

When adding a key to a remote agent constraint extensions such as [email protected] were not serialized in the request. Destination restrictions were silently stripped when forwarding keys, allowing unrestricted use of the key on the remote host. The client now serializes all constraint extensions. Additionally, the in-memory keyring returned by NewKeyring() now rejects keys with unsupported constraint extensions instead of silently ignoring them.

Vendor	golang.org/x/crypto
Product	golang.org/x/crypto/ssh/agent
Published	May 22, 2026
Last Updated	May 22, 2026

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Affected Versions

golang.org/x/crypto / golang.org/x/crypto/ssh/agent

0 < 0.52.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

go.dev: https://go.dev/issue/79435 go.dev: https://go.dev/cl/778642 groups.google.com: https://groups.google.com/g/golang-announce/c/a082jnz-LvI pkg.go.dev: https://pkg.go.dev/vuln/GO-2026-5006

Credits

NCC Group Cryptography Services, sponsored by Teleport