CVE-2026-39833 | BDVDB-2026-334553 Detail

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

Description#

The in-memory keyring returned by NewKeyring() silently accepted keys with the ConfirmBeforeUse constraint but never enforced it. The key would sign without any confirmation prompt, with no indication to the caller that the constraint was not in effect. NewKeyring() now returns an error when unsupported constraints are requested.

Impact#

Per CVSS v3.1: confidentiality impact high, integrity impact high, availability impact none. Attack vector: network.

Weaknesses#

CWE-358 Improperly Implemented Security Check for Standard

References#

Exploit#

No public exploit known

History#

Version 12026-05-22Record published in the CVE List.
Version 22026-08-11Most recent update recorded in the CVE List.

Published

Published: 2026-05-22
Last modified: 2026-08-11

Vendor information

Vendor: golang.org/x/crypto
Product: golang.org/x/crypto/ssh/agent

All golang.org/x/crypto vulnerabilities

Score

9.1 Critical

EPSS

less than 1%, Very Low

Estimated chance of exploitation in the next 30 days. EPSS percentile: 40.9.

KEV

Not listed in the CISA Known Exploited Vulnerabilities catalog.

Impact

Not classified

Action

No specific action is recorded in the source data. Check the references for vendor guidance.

Affected Systems

Vulnerable
< 0.52.0
Fixed
0.52.0

Scoring System

CVSS v4.0

Not available

CVSS v3.1

9.1 Critical

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

Metric breakdown
Attack Vector	Network
Attack Complexity	Low
Privileges Required	None
User Interaction	None
Scope	Unchanged
Confidentiality	High
Integrity	High
Availability	None

CVSS v3.0

Not available

CVSS v2

Not available

Source: CVE List v5 (record); CISA KEV (kev, action); FIRST EPSS (epss).