GHSA-gj49-89wh-h4gjPublished

Cillium exposes sensitive information included in the cilium-bugtool debug archive

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cve-program · CVE-2026-41520

Published

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.

Source published: 8 May 2026 22:01:08 UTC
Source modified: 13 May 2026 19:33:28 UTC
Saved here: 23 Oct 2026 15:48:27 UTC
Source terms: CVE Program Terms of Use

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CVSS 3.1 · 7.9 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

euvd · EUVD-2026-28845

Published

Additional publisher context

EUVD source date text has no stated timezone and is retained without inventing a UTC instant. Related bulletin membership is not an alias, common cause or applicability claim. A missing vector with a zero score is treated as unrated. Complete vendor/product and underlying source evidence remains in the original JSON.

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datePublished: May 8, 2026, 10:01:08 PM

dateUpdated: May 13, 2026, 7:33:28 PM

Source published: May 8, 2026, 10:01:08 PM (timezone not stated)
Source modified: May 13, 2026, 7:33:28 PM (timezone not stated)
Saved here: 13 Nov 2026 15:59:56 UTC
Source terms: ENISA EUVD · source terms and attribution apply

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EUVD CVSS 3.1 · 7.9 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

nvd · CVE-2026-41520

Published

Additional publisher context

NVD analysis and CPE criteria are source context, not proof that a package or your environment is affected. Complete affected data, logical configurations and SSVC are retained in the original JSON.

Source analysis status: Analyzed

Weakness classifications: CWE-200 · CWE-312

Original publisher date fields

published: 2026-05-08T23:16:35.597

lastModified: 2026-11-11T20:10:00.273

1 source CPE criteria · context only

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

The original JSON retains the logical configuration operators, exclusions and version bounds.

Source published: 8 May 2026 23:16:35 UTC
Source modified: 11 Nov 2026 20:10:00 UTC
Saved here: 12 Nov 2026 15:19:01 UTC
Source terms: NIST NVD usage terms; underlying source attribution retained

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CVSS 3.1 · [email protected] · Secondary · 7.9 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

CVSS 3.1 · [email protected] · Primary · 4.4 CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N

osv · GHSA-gj49-89wh-h4gj

Published

### Impact The output of `cilium-bugtool` can contain sensitive data when the tool is run against Cilium deployments with WireGuard encryption enabled. Users of [WireGuard Transparent Encryption](https://docs.cilium.io/en/stable/security/network/encryption-wireguard/) are affected. The sensitive data is the WireGuard private key (`cilium_wg0.key`) used for node-to-node encrypted communication `cilium-bugtool` is a debugging tool that is typically invoked manually and does not run during the normal operation of a Cilium cluster. It is also invoked when gathering sysdumps using the Cilium CLI's `cilium sysdump` command. ### Patches This issue affects: - Cilium v1.19 between v1.19.0 and v1.19.2 inclusive - Cilium v1.18 between v1.18.0 and v1.18.8 inclusive - All versions of Cilium prior to v1.17.15 This issue has been patched in: - Cilium v1.19.3 - Cilium v1.18.9 - Cilium v1.17.15 ### Workarounds There is no workaround to this issue. Users who have previously shared bugtool or sysdump archives from WireGuard-enabled nodes should rotate the WireGuard keys on the affected nodes. This can be done by deleting the key file and restarting the Cilium agent, which will generate a new key pair. ### Acknowledgements The Cilium community has worked together with members of Isovalent to prepare these mitigations. Cillium extends special thanks to @kodareef5 for reporting the issue and @tklauser for their work on triaging and remediating this issue. ### For more information If there are any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/). Cilium strongly encourages the reporting of suspected vulnerabilities to the security mailing list at [[email protected]](mailto:[email protected]). This is a private mailing list for the Cilium security team, and the report will be treated as top priority.

Source published: 25 Apr 2026 23:39:37 UTC
Source modified: 10 Sep 2026 03:51:01 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: GitHub Advisory Database · CC-BY-4.0

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Source: osv · GitHub Advisory Database · CC-BY-4.0. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.

CVSS_V3 · CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Publisher rating · HIGH

osv · GO-2026-5400

Published

Cillium exposes sensitive information included in the cilium-bugtool debug archive in github.com/cilium/cilium

Source published: 25 Jun 2026 22:34:31 UTC
Source modified: 25 Jun 2026 23:11:14 UTC
Saved here: 24 Oct 2026 13:19:41 UTC
Source terms: OSV · upstream source license applies

Original source record · Cite this exact observation · Complete original publisher JSON

Source: osv · OSV · upstream source license applies. The publisher's wording is preserved. ChangeIntel groups the information and labels changes. The JSON record includes additional source fields.