CVE-2026-32241: Flannel is a network fabric for containers, designed for Kubernetes

Q: How do I fix CVE-2026-32241?

flannel: upgrade to 0.28.2. Exact commands for each OS are on this page.

Q: Is CVE-2026-32241 being exploited?

CVE-2026-32241 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-2026-32241 affect?

CVE-2026-32241 affects flannel. Severity is high (CVSS 7.5). Flannel is a network fabric for containers, designed for Kubernetes. The Flannel project includes an experimental Extension backend that allows users to easily prototype new backend types. In versions of Flannel prior to 0.28.2, this Extens

Q: How urgent is CVE-2026-32241?

Priority 53/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADE

CVE-2026-32241 is a high-severity flaw (CVSS 7.5) affecting flannel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

Flannel is a network fabric for containers, designed for Kubernetes. The Flannel project includes an experimental Extension backend that allows users to easily prototype new backend types. In versions of Flannel prior to 0.28.2, this Extension backend is vulnerable to a command injection that allows an attacker who can set Kubernetes Node annotations to achieve root-level arbitrary command execution on every flannel node in the cluster. The Exte

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	Low
User interaction	None
EPSS exploit chance	2.8% (top 14%)
CISA exploited list	No
Weakness	CWE-77
Published	2026-03-27
Last modified	2026-06-17

Publisher (CNA): GitHub, Inc. · Vendor: flannel-io

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

Am I affected?

Timeline

2026-03-27 20:16 UTCPublished CVE record published
2026-06-17 10:35 UTCUpdated Record last modified

flannel-io flannel UPGRADE

Affected: < 0.28.2

Fixed in: 0.28.2

Safe to downgrade to: no unaffected older release

1. Check installed version

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

2. UPGRADE to 0.28.2 (Debian / Ubuntu)

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

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade flannel

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-2026-32241?

flannel: upgrade to 0.28.2. Exact commands for each OS are on this page.

Is CVE-2026-32241 being exploited?

CVE-2026-32241 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-2026-32241 affect?

CVE-2026-32241 affects flannel. Severity is high (CVSS 7.5). Flannel is a network fabric for containers, designed for Kubernetes. The Flannel project includes an experimental Extension backend that allows users to easily prototype new backend types. In versions of Flannel prior to 0.28.2, this Extens

How urgent is CVE-2026-32241?

Priority 53/100. High severity; On your watchlist

Software pages

Kubernetes vulnerabilities

References

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