CVE-2026-41520
Published: 08 May 2026
Summary
CVE-2026-41520 is a high-severity Exposure of Sensitive Information to an Unauthorized Actor (CWE-200) vulnerability in Cilium Cilium. Its CVSS base score is 7.9 (High).
Operationally, exploitation aligns with the MITRE ATT&CK technique Private Keys (T1552.004); ranked at the 0.3th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.
EU & UK References
- 🇪🇺 ENISA EUVD: EUVD-2026-28845
Vulnerability details
Cilium is a networking, observability, and security solution with an eBPF-based dataplane. Prior to versions 1.17.15, 1.18.9, and 1.19.3, the output of cilium-bugtool can contain sensitive data when the tool is run against Cilium deployments with WireGuard encryption enabled. This…
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issue has been patched in versions 1.17.15, 1.18.9, and 1.19.3.
- CWE(s)
Related Threats
MITRE ATT&CK Enterprise TechniquesAI
Why these techniques?
Bugtool output leaks sensitive WireGuard private keys (CWE-312 cleartext exposure) enabling direct credential access.
CVEs Like This One
Affected Assets
Mitigating Controls
Likely Mitigating Controls AI
Per-CVE control mapping for this CVE has not run yet; the list below is derived from the weakness types (CWEs) cited in the NVD entry.
A data action map identifies locations where sensitive information may be exposed to unauthorized actors during processing or transfer.
The media protection policy defines requirements and procedures to prevent unauthorized disclosure or access to sensitive information on media.
Encrypting or otherwise protecting data at rest directly prevents unauthorized actors from reading sensitive information stored on disk or other media.
Directly prevents exposure of critical organizational information by applying OPSEC processes across the SDLC.
Automated marking applies security attributes to system outputs, making it harder for attackers to exploit unmarked sensitive information leading to unauthorized exposure.
Proper attribute retention and permitted-value enforcement limits unauthorized actors from accessing sensitive information lacking correct labels.
Prevents unauthorized exposure of sensitive information by prohibiting untrusted external systems from processing or storing it.
By enforcing authorization matching prior to sharing, the control reduces the risk of exposing sensitive information to unauthorized actors.