Cilium vulnerable to sensitive information disclosure and cluster disruption via local Envoy admin socket access (CVE-2026-49445)
### Impact When Cilium L7 functionality is enabled on a cluster, the Envoy instance supporting this functionality creates a world-accessible socket on cluster nodes. A local attacker would be able to access Envoy admin endpoints. Depending on deployment configuration, this can expose sensitive information or allow disruptive administrative operations, such as: - Exposing TLS secrets - Disrupting traffic in the cluster - Terminating the Envoy process This issue affects both the embedded and standalone Envoy deployment models. ### Patches This issue affects: - Cilium v1.19 between v1.19.0 and v1.19.1 inclusive - Cilium v1.18 between v1.18.0 and v1.18.7 inclusive - All versions of Cilium prior to v1.17.14 This issue has been patched in https://github.com/cilium/cilium/pull/44512, included in: - Cilium v1.19.2 - Cilium v1.18.8 - Cilium v1.17.14 ### Workarounds There is no known workaround to this issue. ### Acknowledgements The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to [moemen](https://github.com/moemen) for reporting the issue and [0xch4z](https://github.com/0xch4z) for their work on triaging and remediating this issue. ### For more information If there are any questions or comments about this advisory, please reach out on [Slack (https://docs.cilium.io/en/latest/community/community/). If anyone thinks they have found a vulnerability affecting Cilium, it is strongly encouraged to report it to the security mailing list at [[email protected]](mailto:[email protected]). This is a private mailing list for the Cilium security team, and the report will be treated as a top priority.
AI Analysis
Technical Summary
CVE-2026-49445 affects Cilium's Envoy instance when L7 functionality is enabled, creating a world-accessible admin socket on cluster nodes. Local attackers can exploit this to access Envoy admin endpoints, potentially exposing sensitive TLS secrets, disrupting cluster traffic, or terminating the Envoy process. The vulnerability impacts both embedded and standalone Envoy deployment models. Affected versions include all Cilium versions prior to 1.17.14, versions from 1.18.0 up to 1.18.7 inclusive, and versions from 1.19.0 up to 1.19.1 inclusive. The issue has been patched in versions 1.17.14, 1.18.8, and 1.19.2. No workarounds are known.
Potential Impact
The vulnerability allows a local attacker to access Envoy admin endpoints via a world-accessible socket, potentially leading to disclosure of sensitive TLS secrets, disruption of cluster traffic, and termination of the Envoy process. This can compromise confidentiality, integrity, and availability of the cluster's networking components.
Mitigation Recommendations
This vulnerability has been officially fixed in Cilium versions 1.17.14, 1.18.8, and 1.19.2. Users should upgrade to these or later versions to remediate the issue. There are no known workarounds. It is recommended to apply the official patches promptly.
Cilium vulnerable to sensitive information disclosure and cluster disruption via local Envoy admin socket access (CVE-2026-49445)
Description
### Impact When Cilium L7 functionality is enabled on a cluster, the Envoy instance supporting this functionality creates a world-accessible socket on cluster nodes. A local attacker would be able to access Envoy admin endpoints. Depending on deployment configuration, this can expose sensitive information or allow disruptive administrative operations, such as: - Exposing TLS secrets - Disrupting traffic in the cluster - Terminating the Envoy process This issue affects both the embedded and standalone Envoy deployment models. ### Patches This issue affects: - Cilium v1.19 between v1.19.0 and v1.19.1 inclusive - Cilium v1.18 between v1.18.0 and v1.18.7 inclusive - All versions of Cilium prior to v1.17.14 This issue has been patched in https://github.com/cilium/cilium/pull/44512, included in: - Cilium v1.19.2 - Cilium v1.18.8 - Cilium v1.17.14 ### Workarounds There is no known workaround to this issue. ### Acknowledgements The Cilium community has worked together with members of Isovalent to prepare these mitigations. Special thanks to [moemen](https://github.com/moemen) for reporting the issue and [0xch4z](https://github.com/0xch4z) for their work on triaging and remediating this issue. ### For more information If there are any questions or comments about this advisory, please reach out on [Slack (https://docs.cilium.io/en/latest/community/community/). If anyone thinks they have found a vulnerability affecting Cilium, it is strongly encouraged to report it to the security mailing list at [[email protected]](mailto:[email protected]). This is a private mailing list for the Cilium security team, and the report will be treated as a top priority.
CVSS v3.1
Score 9.2critical
Affected software
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Weaknesses
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
CVE-2026-49445 affects Cilium's Envoy instance when L7 functionality is enabled, creating a world-accessible admin socket on cluster nodes. Local attackers can exploit this to access Envoy admin endpoints, potentially exposing sensitive TLS secrets, disrupting cluster traffic, or terminating the Envoy process. The vulnerability impacts both embedded and standalone Envoy deployment models. Affected versions include all Cilium versions prior to 1.17.14, versions from 1.18.0 up to 1.18.7 inclusive, and versions from 1.19.0 up to 1.19.1 inclusive. The issue has been patched in versions 1.17.14, 1.18.8, and 1.19.2. No workarounds are known.
Potential Impact
The vulnerability allows a local attacker to access Envoy admin endpoints via a world-accessible socket, potentially leading to disclosure of sensitive TLS secrets, disruption of cluster traffic, and termination of the Envoy process. This can compromise confidentiality, integrity, and availability of the cluster's networking components.
Mitigation Recommendations
This vulnerability has been officially fixed in Cilium versions 1.17.14, 1.18.8, and 1.19.2. Users should upgrade to these or later versions to remediate the issue. There are no known workarounds. It is recommended to apply the official patches promptly.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- GHSA-3fcv-jvfp-m4q9
- Osv Schema Version
- 1.4.0
- Aliases
- ["CVE-2026-49445"]
- Ecosystems
- ["Go"]
- Database Specific Severity
- CRITICAL
- Cvss Version
- 3.1
Threat ID: 6a4c345527e9c797195fe1ca
Added to database: 07/06/2026, 23:03:49 UTC
Last enriched: 07/06/2026, 23:29:43 UTC
Last updated: 07/31/2026, 19:44:19 UTC
Views: 76
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