CVE-2026-41520

Name: CVE-2026-41520
Creator: NVD / NIST
Published: 2026-05-08T23:16:35.597+00:00
License: https://creativecommons.org/publicdomain/zero/1.0/

MEDIUMCVSS 4.4/10EPSS 0.08%

Last modified Jun 17, 2026

CVE-2026-41520 is a medium-severity vulnerability rated 4.4/10 on the CVSS scale. 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. EPSS estimates a 0.08% chance of exploitation in the next 30 days.

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.

Metrics

CVSS 3.1

4.4/10

CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

EPSS Probability

0.08%

0.2th percentile

Probability of exploitation in the next 30 days. Learn more

Weakness Enumeration

Affected Software

Vendor	Product	Versions
Cilium	Cilium	< 1.17.15
Cilium	Cilium	>= 1.18.0, < 1.18.9
Cilium	Cilium	>= 1.19.0, < 1.19.3

References

https://github.com/cilium/cilium/releases/tag/v1.17.15Product, Release Notes
https://github.com/cilium/cilium/releases/tag/v1.18.9Product, Release Notes
https://github.com/cilium/cilium/releases/tag/v1.19.3Product, Release Notes
https://github.com/cilium/cilium/security/advisories/GHSA-gj49-89wh-h4gjMitigation, Vendor Advisory

Timeline

Published: May 8, 2026
Last Modified: Jun 17, 2026
Status: Analyzed

Frequently Asked Questions

What is CVE-2026-41520?

How severe is CVE-2026-41520?

CVE-2026-41520 has a CVSS score of 4.4/10 (MEDIUM severity). The EPSS model estimates a 0.08% probability of exploitation in the next 30 days.

How do I fix CVE-2026-41520?

Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

Are you affected by CVE-2026-41520?

Run a free Strix scan to check your systems for this vulnerability.

Scan your code now

Source: NVD / NIST