CVE-2026-41520 json
Cillium exposes sensitive information included in the cilium-bugtool debug archive
published 2026-04-25 6 mo ago modified 2026-09-10 59 d ago also BIT-cilium-2026-41520 , BIT-cilium-operator-2026-41520 , BIT-hubble-relay-2026-41520 , EUVD-2026-28845 , GHSA-gj49-89wh-h4gj , GO-2026-5400
- cvss
- 7.9
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.1%
- EPSS 0.1% chance of exploitation in 30 days, percentile 0%
- public exploits
- 0
- none known
Summary
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.
Patch / fix
- go github.com/cilium/cilium 1.17.15, 1.18.9, 1.19.3
- bitnami cilium 1.17.15, 1.18.9, 1.19.3
- bitnami cilium-operator 1.17.15, 1.18.9, 1.19.3
- bitnami hubble-relay 1.17.15, 1.18.9, 1.19.3
- cilium cilium 1.17.15, 1.18.9, 1.19.3
- govulncheck-vulndb openSUSE Leap 16.0 0.0.20260723T184607-160000.1.1
opensuse advisories openSUSE-SU-2026:21483-1
CISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- total
- Assessed
- 5 mo ago
Exploit prediction
0.08% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-08).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 7.9 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N |
| GitHub | 3.1 | 7.9 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N |
| NVD | 3.1 | 4.4 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:U/C:H/I:N/A:N |
| OSV | 3.1 | 7.9 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | github.com/cilium/cilium | <1.17.15 >=1.18.0, <1.18.9 >=1.19.0, <1.19.3 |
1.17.15 1.18.9 1.19.3 |
| bitnami | cilium | <1.17.15 >=1.18.0, <1.18.9 >=1.19.0, <1.19.3 |
1.17.15 1.18.9 1.19.3 |
| bitnami | cilium-operator | <1.17.15 >=1.18.0, <1.18.9 >=1.19.0, <1.19.3 |
1.17.15 1.18.9 1.19.3 |
| bitnami | hubble-relay | <1.17.15 >=1.18.0, <1.18.9 >=1.19.0, <1.19.3 |
1.17.15 1.18.9 1.19.3 |
Affected products
- cilium cilium
Classification
References
-
github.com
/cilium/cilium/security/advisories/GHSA-gj49-89wh-h4gj
web, mitigation, vendor-advisory, advisory
-
github.com
/cilium/cilium/releases/tag/v1.17.15
web, product, release-notes, article
-
github.com
/cilium/cilium/releases/tag/v1.18.9
web, product, release-notes, article
-
github.com
/cilium/cilium/releases/tag/v1.19.3
web, product, release-notes, article
-
nvd.nist.gov
/vuln/detail/CVE-2026-41520
advisory, web
-
github.com
/cilium/cilium
package
-
docs.cilium.io
/en/stable/security/network/encryption-wireguard
web
Sources
- CVE List CVE-2026-41520
- GitHub Advisory GHSA-gj49-89wh-h4gj
- NVD CVE-2026-41520
- OSV BIT-cilium-2026-41520
- OSV BIT-cilium-operator-2026-41520
- OSV BIT-hubble-relay-2026-41520
- OSV GO-2026-5400
Fencer Vulns keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.