CVE-2025-55199: Helm is a package manager for Charts for Kubernetes

Q: How do I fix CVE-2025-55199?

helm: upgrade to 3.18.5. Exact commands for each OS are on this page.

Q: Is CVE-2025-55199 being exploited?

CVE-2025-55199 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2025-55199 affect?

CVE-2025-55199 affects helm. Severity is medium (CVSS 6.5). Helm is a package manager for Charts for Kubernetes. Prior to version 3.18.5, it is possible to craft a JSON Schema file in a manner which could cause Helm to use all available memory and have an out of memory (OOM) termination. This issue

Q: How urgent is CVE-2025-55199?

Priority 34/100. On your watchlist

Routine

MEDIUM 6.5WATCHLISTUPGRADE

CVE-2025-55199 is a medium-severity flaw (CVSS 6.5) affecting helm. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Helm is a package manager for Charts for Kubernetes. Prior to version 3.18.5, it is possible to craft a JSON Schema file in a manner which could cause Helm to use all available memory and have an out of memory (OOM) termination. This issue has been resolved in Helm 3.18.5. A workaround involves ensuring all Helm charts that are being loaded into Helm do not have any reference of $ref pointing to /dev/zero.

Why this priority

On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.3% (top 73%)
CISA exploited list	No
Weakness	CWE-770
Published	2025-08-14
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: helm

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2025-08-14 00:15 UTCPublished CVE record published
2026-06-17 09:41 UTCUpdated Record last modified

helm helm UPGRADE

Affected: < 3.18.5

Fixed in: 3.18.5

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy helm || rpm -q helm || helm --version

2. UPGRADE to 3.18.5 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade helm

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade helm

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2025-55199?

helm: upgrade to 3.18.5. Exact commands for each OS are on this page.

Is CVE-2025-55199 being exploited?

CVE-2025-55199 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2025-55199 affect?

CVE-2025-55199 affects helm. Severity is medium (CVSS 6.5). Helm is a package manager for Charts for Kubernetes. Prior to version 3.18.5, it is possible to craft a JSON Schema file in a manner which could cause Helm to use all available memory and have an out of memory (OOM) termination. This issue

How urgent is CVE-2025-55199?

Priority 34/100. On your watchlist

Software pages

Kubernetes vulnerabilities · Helm vulnerabilities

Related CVEs

CVE-2026-63308 MEDIUM 4.3 UPGRADE Helm through 4.2.3, fixed in commit ba6c9a2, contains a denial of service vulnerability in the Files.Lines tem
CVE-2026-35205 HIGH 7.8 UPGRADE Helm is a package manager for Charts for Kubernetes
CVE-2026-35204 HIGH 8.6 UPGRADE Helm is a package manager for Charts for Kubernetes
CVE-2026-35206 MEDIUM 4.4 UPGRADE Helm is a package manager for Charts for Kubernetes
CVE-2025-55198 MEDIUM 6.5 UPGRADE Helm is a package manager for Charts for Kubernetes

References

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