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GHSA-38pp-6gcp-rqvm

MediumCVSS 4 / 10
Published Dec 1, 2025·Last modified Feb 4, 2026
Affected Components(0)

No affected components available

Description

Impact

CiliumNetworkPolicys which use egress.toGroups.aws.securityGroupsIds to reference AWS security group IDs that do not exist or are not attached to any network interface may unintentionally allow broader outbound access than intended by the policy authors. In such cases, the toCIDRset section of the derived policy is not generated, which means outbound traffic may be permitted to more destinations than originally intended.

Patches

This issue has been patched in:

  • Cilium v1.18.4
  • Cilium v1.17.10
  • Cilium v1.16.17

This issue affects:

  • Cilium v1.18 between v1.18.0 and v1.18.3 inclusive
  • Cilium v1.17 between v1.17.0 and v1.17.9 inclusive
  • Cilium v1.16.16 and below

Workarounds

There is no workaround to this issue.

Acknowledgements

The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to @SeanEmac for reporting this issue and to @fristonio for the patch.

For more information

If you think you have found a vulnerability affecting Cilium, we strongly encourage you to report it to our security mailing list at security@cilium.io. This is a private mailing list for the Cilium security team, and your report will be treated as top priority.

Risk Scores
Base Score
4.0

The vulnerability requires local access to the device to be exploited. It is easy for an attacker to exploit this vulnerability. An attacker does not need any special privileges or access rights. No user interaction is needed for the attacker to exploit this vulnerability. The impact is confined to the system where the vulnerability exists. There is a low impact on the confidentiality of the information.

Threat Intelligence
3.7

Limited exploitation activity has been observed. Close monitoring and planned remediation are recommended.

EPSS
0.18%

The exploit probability is very low. The vulnerability is unlikely to be exploited in the next 30 days.

Exploit
Not available

We did not find any exploit available. Neither in GitHub repositories nor in the Exploit-Database.

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