Cleartext Storage of Sensitive Information Affecting github.com/cilium/cilium/bugtool/cmd package, versions <1.17.15>=1.18.0-pre.0 <1.18.9>=1.19.0-pre.0 <1.19.3
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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- published27 Apr 2026
- disclosed25 Apr 2026
- creditkodareef5
Introduced: 25 Apr 2026
CVE-2026-41520 Â (opens in a new tab)How to fix?
Upgrade github.com/cilium/cilium/bugtool/cmd to version 1.17.15, 1.18.9, 1.19.3 or higher.
Overview
Affected versions of this package are vulnerable to Cleartext Storage of Sensitive Information in the form of all state directory files, including the WireGuard private key file, being included in archives by default. The runTool() function does not remove this file before archiving. Using the private key, an attacker can decrypt WireGuard-encrypted traffic to and from the affected node, impersonate the node in the WireGuard mesh or intercept pod-to-pod encrypted traffic.
Note: This is only exploitable if the debug tool is run on nodes where WireGuard Transparent Encryption is active and the resulting archives are shared or accessed by unauthorized parties.
Note: If a bugtool or sysdump archive from a WireGuard-enabled node has previously been shared with an untrusted party, keys should be rotated after the tool is upgraded to a safe version.