Double Free Affecting k3s-1.33 package, versions <1.33.10.1-r11


Severity

Recommended
0.0
high
0
10

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Threat Intelligence

Social Trends
EPSS
0.81% (53rd percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-K3S133-16726799
  • published17 May 2026
  • disclosed7 May 2026

Introduced: 7 May 2026

CVE-2026-33811  (opens in a new tab)
CWE-415  (opens in a new tab)

How to fix?

Upgrade Chainguard k3s-1.33 to version 1.33.10.1-r11 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream k3s-1.33 package and not the k3s-1.33 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

When using LookupCNAME with the cgo DNS resolver, a very long CNAME response can trigger a double-free of C memory and a crash.

References

CVSS Base Scores

version 3.1