CVE-2026-39832

critical

Published 2026-05-22 · Modified 2026-05-27

CVSS v3

9.1

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v2

—

VIR risk

9.1

Description

When adding a key to a remote agent constraint extensions such as restrict-destination-v00@openssh.com 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.

Predictions

Exploit likelihood

94%

Patch ETA

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Heuristic predictions, AS-IS, for prioritization only.

Mitigations

vendor Authored 2026-05-27

Vendor advisory: suse — https://www.suse.com/security/cve/CVE-2026-39832.html

vendor Authored 2026-05-27

Vendor advisory: debian — https://security-tracker.debian.org/tracker/CVE-2026-39832

OS impact

OS	Version	Status	Fixed in
debian	bookworm	affected
debian	bullseye	affected
debian	forky	affected
debian	sid	fixed	`1:0.52.0-1`
debian	trixie	affected
sles		affected

Package impact

Ecosystem	Package	Vulnerable	Fixed
Go	golang.org/x/crypto	`<0.52.0`	`0.52.0`

References

Verify integrity in audit chain (admin only). AS-IS.