9.1

CVE-2026-39833: golang crypto Missing Authorization

CVSS: 9.1v3.1CriticalModified
AliasesUBUNTU-CVE-2026-39833DEBIAN-CVE-2026-39833CGA-22vh-fmqr-9g92
Published 22-05-2026Last modified 11-08-2026
Open JSON

Vulnerability summary

CVE-2026-39833 is a critical (CVSS 9.1) Missing Authorization vulnerability in golang crypto. EPSS estimates a 0.49% chance of exploitation in the next 30 days, higher than 40.6% of scored vulnerabilities.

Overall risk
70/100
0100
High · default modelHow is this calculated?
CVSS score
9.1/10
010
Critical · v3.1 (CVE.org)
EPSS score
0.49%
0%100%
Low · +0.07 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 51 · Related 54
OPENSUSE-SU-2026:10856-1OPENSUSE-SU-2026:10949-1OPENSUSE-SU-2026:11126-1OPENSUSE-SU-2026:20956-1OPENSUSE-SU-2026:21069-1OPENSUSE-SU-2026:21079-1

Timeline

  1. 22-05-2026
    PublishedVulnerability first disclosed.
  2. 11-08-2026
    Last modifiedVulnerability information updated.

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 metrics

7 scores · 7 sources · 1 version

EPSS trend

Probability

0.49%

Chance of exploitation in the next 30 days

Percentile

41%

Versus all other CVEs

30-day change

+0.07 pp

From 0.41% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.49%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Chainguard200 products
  • aactl< 0.4.12-r53
  • actAll versions (No fix recorded)
  • actions-runner-controllerAll versions (No fix recorded)
  • actions-runner-controller-fipsAll versions (No fix recorded)
  • ageAll versions (No fix recorded)

1 vendor · 200 products · Showing 200 of 2857. Use Open JSON for the complete list.

References

16 links
Show all 16 references