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CVE-2026-39832

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

Published: May 22, 2026Updated: Aug 7, 2026 Sources: CVE List NVDCWE-502
9.1CRITICAL
NVD MITRE
EPSS Score
0.6%
Top 54.5%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available
Self-Check
OpenVAS

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.

No summary for this CVE yet.

CVSS Vector Breakdown

AV:NAC:LPR:NUI:NS:UC:HI:HA:N
Exploitability
AV:NAttack Vector
Network
AC:LAttack Complexity
Low
PR:NPrivileges Required
None
UI:NUser Interaction
None
Scope
S:UScope
Unchanged
Impact
C:HConfidentiality
High
I:HIntegrity
High
A:NAvailability
None
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Weaknesses

CWE-502CWE-281

Affected Products

golang.org/x/crypto
oss-projectaka golang x crypto, x/crypto
golang.org/x/crypto/ssh/agentLibrary
OSS Libraries / go
golang
oss-project·US
crypto
OSS Libraries

Exploitability

Official Patch Available
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Attack Graph

Products CVE Techniques Tactics

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MITRE ATT&CK

4 techniques
Execution
Initial Access
Privilege Escalation
View detailed technique mapping

References

https://go.dev/issue/79435
go.dev
https://go.dev/cl/778642
go.dev
https://groups.google.com/g/golang-announce/c/a082jnz-LvI
groups.google.com
and 30 more references View all →

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