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Fencer Intel
high 7.9

CVE-2026-41520 json

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

published 6mo ago modified last mo. 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

Is CVE-2026-41520 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.

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CISA SSVC

Exploitation
none
Automatable
no
Technical impact
total
Assessed
5mo ago

Exploit prediction

0.08% chance of exploitation in the next 30 days, higher than 0% of all scored CVEs (FIRST EPSS, 2026-11-09).

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

Weakness
  • CWE-200 Exposure of Sensitive Information to an Unauthorized Actor
  • CWE-312 Cleartext Storage of Sensitive Information

References

Sources

Fencer Intel 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.