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CVE-2026-39833

40
FAUCET Score

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.

First published: May 22, 2026Last modified: May 22, 2026

Impacted Technologies

VendorProductVersion(s)CPE
< 0.52.0CPE matchmatch criteria
cpe:2.3:a:golang:crypto:*:*:*:*:*:go:*:*

CVSS Data

CVSS version used by this source: 3.1

9.1CRITICAL

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

Attack Vector
NETWORK
Attack Complexity
LOW
Privileges Required
NONE
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
NONE
Exploitability Score
3.9
Impact Score
5.2
CvssVersion
3.1

Exploit Intelligence

EPSS Score
0.41%
Probability of exploitation in next 30 days
EPSS Percentile
33.8%
Percentile rank of EPSS score among Peer Group
As of 2026-07-27
Model: v2026.06.15
This CVE's current EPSS score of 0.0041 is in the 11th percentile among its peer group of 36,862 CVEs.

Social Chatter

The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.

Media Mentions

No media coverage found for this CVE.

The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.

Remediation

Patch Available

Vendor Patches (11)

gopatch availablevia ghsa
Product: golang.org/x/cryptoFixed in: 0.52.0
microsoftpatch availablevia msrc
Product: azl3 telegraf 1.31.0-22 on Azure Linux 3.0Fixed in: 1.31.0-23
microsoftpatch availablevia msrc
Product: azl3 docker-compose 2.27.0-11 on Azure Linux 3.0Fixed in: 2.27.0-13
microsoftpatch availablevia msrc
Product: azl3 packer 1.9.5-15 on Azure Linux 3.0Fixed in: 1.9.5-16
microsoftpatch availablevia msrc
Product: 21408-17084Fixed in: 0.14.0-15
microsoftpatch availablevia msrc
Product: 21409-17084Fixed in: 2.27.0-13
microsoftpatch availablevia msrc
Product: 21383-17084Fixed in: 1.9.5-16
microsoftpatch availablevia msrc
Product: 21395-17084Fixed in: 1.31.0-23
microsoftpatch availablevia msrc
Product: azl3 docker-buildx 0.14.0-13 on Azure Linux 3.0Fixed in: 0.14.0-15
ubuntupatch availablevia ubuntu_usn
Product: lxd (xenial)Fixed in: 2.0.11-0ubuntu1~16.04.4+esm3
ubuntupatch availablevia ubuntu_usn
Product: lxd (bionic)Fixed in: 3.0.3-0ubuntu1~18.04.2+esm3

Vendor Advisories (3)

goGHSA-jppx-rxg9-jmrxcritical

golang.org/x/crypto doesn't enforce invoking key constraints

Jun 25, 2026
ubuntuUSN-8447-2

LXD vulnerabilities

Jun 18, 2026
microsoft2026-May/CVE-2026-39833Important

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

May 12, 2026

References

go.dev / cl/778640
Issue Tracking
go.dev / cl/778641
Issue Tracking
go.dev / issue/79436
Issue Tracking
groups.google.com / g/golang-announce/c/a082jnz-LvI
Mailing List
pkg.go.dev / vuln/GO-2026-5005
Vendor Advisory