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VulnerabilityPublished Updated

CVE-2026-41520: cilium · Information Exposure

Affects ciliumSource GCVE Database

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Not known to be exploited · CVSS 7.9 High · fixed in 1.19.3 : patch cilium soon.

Data as of 11 Nov 2026, 23:06 UTC

CVSS 3.1 base score
7.9High
How severe the flaw is on the 0–10 CVSS scale.

Thin evidence

One scorer or none
CVSS scores by source
CNA (GitHub_M)CVSS 3.17.9
Patch
Available – fixed in 1.19.3, 1.18.9, 1.17.15
CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N

Exploitation evidence

  1. Disclosed: evidence found.

    CVE published 8 May 2026

  2. Detectable: no evidence on record.

    No public nuclei template indexed

  3. Weaponized: no evidence on record.

    No public exploit code indexed in Metasploit or Exploit-DB

  4. Exploited in the wild: no evidence on record.

    Not in CISA KEV and no source reports exploitation

  5. Observed by OffSeq Mirage: no evidence on record.

    No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 11 Nov 2026.

What to do

Upgrade cilium to 1.19.3, 1.18.9 or 1.17.15.

Affected software

ProductAffectedFixed in
cilium ciliumAffected
  • <1.17.15
  • >=1.18.0 <1.18.9
  • >=1.19.0 <1.19.3
Fixed in
  • 1.17.15
  • 1.18.9
  • 1.19.3

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.

References

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