🛡️ CVE-2024-42486 — cilium

🟠 CVSS 8.0 — High ✅ No Known Exploit CWE-200 OSV
8.0
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

Cilium leaks information via incorrect ReferenceGrant update logic in Gateway API

Impact

Due to ReferenceGrant changes not being immediately propagated in Cilium's GatewayAPI controller, Gateway resources are able to access secrets in other namespaces after the associated ReferenceGrant has been revoked. This can lead to Gateways continuing to establish sessions using secrets that they should no longer have access to.

Patches

This issue was resolved in https://github.com/cilium/cilium/pull/34032.

This issue affects:

  • Cilium v1.15 between v1.15.0 and v1.15.7 inclusive
  • Cilium v1.16.0

This issue has been patched in:

  • Cilium v1.15.8
  • Cilium v1.16.1

Workarounds

Any modification of a related Gateway/HTTPRoute/GRPCRoute/TCPRoute CRD (for example, adding any label to any of these resources) will trigger a reconciliation of ReferenceGrants on an affected cluster.

Acknowledgements

The Cilium community has worked together with members of Cure53 and Isovalent to prepare these mitigations. Special thanks to @sayboras for resolving this issue.

For more information

If you have any questions or comments about this advisory, please reach out on [Slack](https://docs.cilium.io/en/latest/community/community/#slack).

If you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at [[email protected]](mailto:[email protected]). This is a private mailing list for the Cilium security team, and your report will be treated as top priority.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. No user interaction is required. The scope is changed, meaning a successful attack can affect components beyond the vulnerable one. Rated impact: confidentiality low, integrity low, availability none.

Weakness class

CVE-2024-42486 is classified as CWE-200: Exposure of Sensitive Information. Information that should stay internal is disclosed to someone who is not authorised to see it.

Affected software

CVE-2024-42486 is recorded against 4 packages.

  • cilium
  • cilium-operator
  • github.com/cilium/cilium
  • hubble-relay

Timeline and source

Published on 20 August 2024 and last revised on 17 June 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from OSV.

References

github.com (Web)
github.com (Web)
github.com (Web)
nvd.nist.gov (Web)

Details

Severity HIGH
CVSS Score 8.0
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:C/C:L/I:L/A:N
CWE CWE-200
Public Exploit ✅ No
Source OSV
Published 2024-08-20
Updated 2026-08-12
Modified 2026-06-17

Affected Packages

Software From version Fixed in
cilium — —
cilium-operator — —
github.com/cilium/cilium — —
hubble-relay — —

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