CVE Tools
Sign in

CVE-2026-39833

Invoking key constraints not enforced in golang.org/x/crypto/ssh/agent

Published: May 22, 2026Updated: May 28, 2026 Sources: CVE List NVDCWE-862
NVD MITRE
9.1CVSSCRITICAL
EPSS Score
0.3%
Top 78.7%
CISA KEV
Not in KEV
Exploits
No Known Exploits
Remediation
Patch Available

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.

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
Open in CVSS calculator →

Weaknesses

CWE-862

Affected Products

cryptogolangOSS Libraries
golang.org/x/crypto/ssh/agentgolang.org/x/crypto
Library
OSS Libraries / go
golangoss-projectUSOSS Libraries
golang.org/x/cryptooss-projectOSS Librariesaka x/crypto, golang x crypto

Attack Graph

Products CVE Techniques Tactics

Click technique nodes to view MITRE ATT&CK details. Scroll to zoom, drag to pan.

Exploitability

Official Patch Available

MITRE ATT&CK

2 techniques
Initial Access
View detailed technique mapping

References

https://go.dev/cl/778640
go.dev
https://go.dev/cl/778641
go.dev
https://go.dev/issue/79436
go.dev
and 2 more references View all →

Timeline

Published
May 22, 2026
Last Updated
May 28, 2026

Unlock Complete Vulnerability Intelligence

Get the full picture for CVE-2026-39833 and every CVE in our database. Create a free account — no credit card required.

Create Free Account
Plain-language analysis
Impact assessment and exploitation scenario in plain English
Attack graph visualization
Interactive attack path and kill chain mapping
Exploit details & PoC links
ExploitDB, Metasploit, GitHub PoCs with direct links
Nuclei scanner templates
Ready-to-use vulnerability scanner templates
Full remediation guide
Patch instructions, workarounds, and compliance impact
Interactive AI chat
Ask questions about this vulnerability in natural language
Related vulnerabilities
Semantically similar CVEs and attack patterns
REST API & MCP access
Integrate vulnerability data into your workflows