by Kastro CVE-2026-39832
golang.org/x/crypto golang.org/x/crypto/ssh/agent — Invoking agent constraints dropped when forwarding keys in golang.org/x/crypto/ssh/agent
Description · from the CVE record
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.
Affected
ProductAffectedFixed inSource
golang.org/x/crypto/ssh/agent< 0.52.00.52.0CNA
Red Hat Enterprise Linux 10see advisory2:1.43.1-3.el10_2redhat-SADP
Red Hat Enterprise Linux 10see advisory7:5.8.2-4.el10_2redhat-SADP
Red Hat Enterprise Linux 8see advisory8100020260701102925.afee755dredhat-SADP
Red Hat Enterprise Linux 8.8 Telecommunications Update Servicesee advisory8080020260721142025.63b34585redhat-SADP
Red Hat Enterprise Linux 8.8 Update Services for SAP Solutionssee advisory8080020260721142025.63b34585redhat-SADP
Red Hat Enterprise Linux 9see advisory6:5.8.2-4.el9_8redhat-SADP
Red Hat Enterprise Linux 9see advisory2:1.43.1-3.el9_8redhat-SADP
RHEM 1.0 for RHEL 9see advisory0:1.0.3-1.el9emredhat-SADP
RHEM 1.1 for RHEL 10see advisory0:1.1.3-1.el10emredhat-SADP
RHEM 1.1 for RHEL 9see advisory0:1.1.3-1.el9emredhat-SADP
Cluster Observability Operator 1.5.0see advisory1787593637redhat-SADP
Scores by source
CISA ADP9.1CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
redhat-SADP (CNA)8.7CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:H/I:H/A:N
CISA ADPSSVCExploitation: none · Automatable: yes · Technical impact: total