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

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Summary

CVECVE-2026-39832
StatePUBLISHED
AssignerGo
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-05-22 04:16:22 UTC
Updated2026-05-28 15:11:29 UTC
DescriptionWhen 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.

Risk And Classification

Primary CVSS: v3.1 9.1 CRITICAL from ADP

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

EPSS: 0.000300000 probability, percentile 0.088890000 (date 2026-05-27)

Problem Types: CWE-502 | CWE-281: Improper Preservation of Permissions

VersionSourceTypeScoreSeverityVector
3.1ADPDECLARED9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1134c704f-9b21-4f2e-91b3-4a467353bcc0Secondary9.1CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

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

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

NVD Known Affected Configurations (CPE 2.3)

TypeVendorProductVersionUpdateEditionLanguage
Application Golang Crypto All All All All

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Golang.orgxcrypto Golang.org/x/crypto/ssh/agent affected 0.52.0 semver Not specified

References

ReferenceSourceLinkTags
groups.google.com/g/golang-announce/c/a082jnz-LvI [email protected] groups.google.com Mailing List
go.dev/cl/778642 [email protected] go.dev Issue Tracking
go.dev/issue/79435 [email protected] go.dev Issue Tracking
pkg.go.dev/vuln/GO-2026-5006 [email protected] pkg.go.dev Vendor Advisory
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: NCC Group Cryptography Services, sponsored by Teleport (en)

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