How severe is CVE-2026-41520?

CVE-2026-41520 has a CVSS 3.x base score of 7.9, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.

Is CVE-2026-41520 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-41520?

CVE-2026-41520 affects Cilium. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-41520?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-41520 have an EU (EUVD) identifier?

Yes. CVE-2026-41520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28845.

When was CVE-2026-41520 published?

CVE-2026-41520 was published on 2026-05-08 and last updated on 2026-06-17.

CVE-2026-41520

CVE-2026-41520 is a high-severity vulnerability in Cilium with a CVSS 3.x base score of 7.9. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-312.

Key facts

Severity: High (CVSS 3.x base score 7.9)
EPSS exploit prediction: 0% (1st percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-28845
Weakness: CWE-312
Affected product: Cilium
Published: 2026-05-08
Last modified: 2026-06-17

Description

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 issue has been patched in versions 1.17.15, 1.18.9, and 1.19.3.

Frequently asked questions

What is CVE-2026-41520?: 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 issue has been patched in versions 1.17.15, 1.18.9, and 1.19.3.
How severe is CVE-2026-41520?: CVE-2026-41520 has a CVSS 3.x base score of 7.9, rated high severity. It is exploitable over local access with low attack complexity, requires high privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability none.
Is CVE-2026-41520 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (1st percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-41520?: CVE-2026-41520 affects Cilium. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-41520?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-41520 have an EU (EUVD) identifier?: Yes. CVE-2026-41520 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-28845.
When was CVE-2026-41520 published?: CVE-2026-41520 was published on 2026-05-08 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:cilium:cilium:*:*:*:*:*:*:*:*

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