Helm 3.21
Current status
Helm 3.21 is currently in standard support.
Official lifecycle source: Helm GitHub Releases
- Support phase
- standard support
- End of life
- Not officially published
- Latest release
- 3.21.4
- Released
- 14 Aug 2026
At a glance
- Version line
- 3.21
- Initial release
- 14 May 2026
- Lifecycle phase
- standard support
- Latest stable
- 3.21.4
- Latest release date
- 14 Aug 2026
- EOL
- Not officially published
- Risk
- low
- Releases tracked
- 5
Lifecycle timeline
Phases from published LifecyclePeriod records. Missing phases are not inferred.
Release
14 May 2026
standard supportcurrent
14 May 2026 → —
Source: Helm GitHub Releases
Helm 3.21 is currently in standard support.
Security
Advisories affecting Helm 3.21 (OSV.dev evidence). Known exploited status, due dates, and ransomware use from CISA KEV when matched.
- Known vulnerabilities
- 1
- Known exploited
- 0
- Highest CVSS
- —
- CVE-2026-63308
Helm Files.Lines Denial of Service via Empty Chart Files
- Affected:
- <=4.2.3
- Source:
- OSV source · Advisory
Latest release
Previous releases
3.21.3
9 Jul 2026
3.21.2
20 Jun 2026
3.21.1
12 Jun 2026
Release history
5 concrete releases tracked for this line.
Release activity
- Total releases
- 5
- Last 30 days
- 1
- Last 90 days
- 4
- Avg. interval
- ~23 days
- Most recent
- 14 Aug 2026
Should I use this version?
Suitable for new deployments
Helm 3.21 is currently supported (standard support).
Upgrade options
Newer supported Helm version lines from CompatHub lifecycle data. Compatibility and security context use existing evidence only.
You are on Helm 3.21
Supported
Supported upgrade options
- Helm 4.2Upgrade planner →Supported· 1 major version newer
- Helm 4.1Upgrade planner →Supported· 1 major version newer
- Helm 4.0Upgrade planner →Supported· 1 major version newer
Version comparison
Compact comparison against the nearest relevant release lines.
Sources
Where this information comes from.
Lifecycle sources
- Helm GitHub Releasesfirst party · high confidence
Official source: https://api.github.com/repos/helm/helm/releases
Last verified 31 Aug 2026
- CISA Known Exploited Vulnerabilitiesfirst party
Official source: https://www.cisa.gov/known-exploited-vulnerabilities-catalog
Verification time not recorded
- NVD (NIST)first party
Official source: https://nvd.nist.gov
Verification time not recorded
- OSV.devfirst party
Official source: https://osv.dev
Verification time not recorded
Release sources
- Helm GitHub Releasesfirst party · high confidence
Official source: https://api.github.com/repos/helm/helm/releases
Last verified 31 Aug 2026
Data coverage
Last checked = last successful upstream check. Latest source update = when upstream content last changed.
- Releases tracked
- 5
- Lifecycle periods
- 1
- EOL
- Not officially published
- Provenance records
- 2
- Data last checked
- 31 Aug 2026
- Latest source update
- 31 Aug 2026
EOL: Not officially published