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

cve-program · severity unknownEUVD CVSS 3.1 9.1 CVSS 3.1 · 134c704f-9b21-4f2e-91b3-4a467353bcc0 · Secondary 9.1 CRITICALCVSS 3.1 · 0b0ca135-0b70-47e7-9f44-1890c2a1c46c · Secondary 8.7 HIGHCVSS_V3 Publisher rating CRITICALFixed by golang.org/x/crypto 0.52.0osv · severity unknownFixed by golang.org/x/crypto 0.52.0KEV status unknown

cve-program · CVE-2026-39832

Published

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.

Read the publisher's advisory

euvd · EUVD-2026-31390

Published

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.

Read the publisher's advisory

nvd · CVE-2026-39832

Published

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.

Read the publisher's advisory

osv · GHSA-f5wc-c3c7-36mc

Published

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.

Read the publisher's advisory

osv · GO-2026-5006

Published

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.

Read the publisher's advisory

Affected versions, risk and source history

Related advisories and sources

Publishers link these advisories through the identifiers shown below. A shared identifier or date alone does not tell you whether your software is affected or whether the advisories describe the same cause.

CVE-2026-39832 · CVE overview and exploitation status

EUVD-2026-31390

GHSA-f5wc-c3c7-36mc

GO-2026-5006

cve-program · CVE-2026-39832

euvd · EUVD-2026-31390

nvd · CVE-2026-39832

osv · GHSA-f5wc-c3c7-36mc

osv · GO-2026-5006

Related changes

Linked by CVE identifier
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Sources read 13 Nov 14:14 UTC · 274 of 275 readable · 273 fully read · documentation 469/469 current