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7.1
Antrea Fails to Encrypt IPv6 Traffic in Dual-Stack Clusters
GHSA-qcmw-8mm4-4p28
CVE-2026-34992
Summary
If you use Antrea with dual-stack networking and encryption, some data may be sent unencrypted. This is a security risk, especially for sensitive information. To fix this, update to Antrea version 2.6.0 or later, or patch to version 2.5.2 or 2.4.5.
What to do
- Update antrea.io antrea to version 1.11.0-alpha.0.0.20260225185322-738bad662b20.
Affected software
| Vendor | Product | Affected versions | Fix available |
|---|---|---|---|
| antrea.io | antrea | > 1.11.0 , <= 2.4.5 | – |
| antrea.io | antrea | > 2.5.0 , <= 2.5.2 | – |
| antrea.io | antrea | <= 1.11.0-alpha.0.0.20260225185322-738bad662b20 | 1.11.0-alpha.0.0.20260225185322-738bad662b20 |
Original title
Antrea has Missing Encryption of Sensitive Data
Original description
### Impact
This is a missing encryption vulnerability (CWE-311) affecting inter-Node Pod traffic. In Antrea clusters configured for dual-stack networking with IPsec encryption enabled (`trafficEncryptionMode: ipsec`), Antrea fails to apply encryption for IPv6 Pod traffic.
While the IPv4 traffic is correctly encrypted via ESP (Encapsulating Security Payload), traffic using IPv6 is transmitted in plaintext. This occurs because the packets are encapsulated (using Geneve or VXLAN) but bypass the IPsec encryption layer.
Impacted Users: users with dual-stack clusters and IPsec encryption enabled.
Single-stack IPv4 or IPv6 clusters are not affected.
### Patches
Yes, the issue has been patched: https://github.com/antrea-io/antrea/pull/7759
Users should upgrade to one of the following versions:
* Antrea v2.6.0 or later
* Antrea v2.5.2
* Antrea v2.4.5
Antrea recommends running the `antctl check installation --run ipsec` tool after upgrading to verify that both address families are correctly producing ESP traffic.
### Workarounds
There is no configuration workaround to enable IPsec IPv6 in affected versions. If an immediate upgrade is not possible, user may consider using WireGuard instead for inter-Node Pod traffic encryption. The WireGuard support in Antrea does *not* suffer from the same issue.
### Resources
Pull Request with Fix: [antrea-io/antrea#7759](https://github.com/antrea-io/antrea/pull/7759)
Validation Tool PR: [antrea-io/antrea#7757](https://github.com/antrea-io/antrea/pull/7757)
Antrea Documentation: [Traffic Encryption Guide](https://github.com/antrea-io/antrea/blob/main/docs/traffic-encryption.md)
This is a missing encryption vulnerability (CWE-311) affecting inter-Node Pod traffic. In Antrea clusters configured for dual-stack networking with IPsec encryption enabled (`trafficEncryptionMode: ipsec`), Antrea fails to apply encryption for IPv6 Pod traffic.
While the IPv4 traffic is correctly encrypted via ESP (Encapsulating Security Payload), traffic using IPv6 is transmitted in plaintext. This occurs because the packets are encapsulated (using Geneve or VXLAN) but bypass the IPsec encryption layer.
Impacted Users: users with dual-stack clusters and IPsec encryption enabled.
Single-stack IPv4 or IPv6 clusters are not affected.
### Patches
Yes, the issue has been patched: https://github.com/antrea-io/antrea/pull/7759
Users should upgrade to one of the following versions:
* Antrea v2.6.0 or later
* Antrea v2.5.2
* Antrea v2.4.5
Antrea recommends running the `antctl check installation --run ipsec` tool after upgrading to verify that both address families are correctly producing ESP traffic.
### Workarounds
There is no configuration workaround to enable IPsec IPv6 in affected versions. If an immediate upgrade is not possible, user may consider using WireGuard instead for inter-Node Pod traffic encryption. The WireGuard support in Antrea does *not* suffer from the same issue.
### Resources
Pull Request with Fix: [antrea-io/antrea#7759](https://github.com/antrea-io/antrea/pull/7759)
Validation Tool PR: [antrea-io/antrea#7757](https://github.com/antrea-io/antrea/pull/7757)
Antrea Documentation: [Traffic Encryption Guide](https://github.com/antrea-io/antrea/blob/main/docs/traffic-encryption.md)
ghsa CVSS4.0
7.1
Vulnerability type
CWE-311
Missing Encryption of Sensitive Data
- https://github.com/antrea-io/antrea/security/advisories/GHSA-qcmw-8mm4-4p28
- https://github.com/antrea-io/antrea/pull/7757
- https://github.com/antrea-io/antrea/pull/7759
- https://github.com/antrea-io/antrea/commit/738bad662b20a5d358d19466936176ef580a9...
- https://github.com/antrea-io/antrea/blob/main/docs/traffic-encryption.md
- https://github.com/advisories/GHSA-qcmw-8mm4-4p28
Published: 3 Apr 2026 · Updated: 3 Apr 2026 · First seen: 3 Apr 2026