CVE-2026-41185 ServiceAccount token disclosure via Azure IPAM CNI plugin logs
Attackers with node log access can steal ServiceAccount tokens from Calico Azure IPAM logs, enabling cluster-wide privilege escalation.
- Exploited in the wild
- Not known
- Login needed
- Any signed-in user
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- Available
What is CVE-2026-41185?
CVE-2026-41185 is a medium-severity vulnerability in Tigera Calico, published on 28 May 2026. Any signed-in user can exploit it over the network, with no action from the victim.
Official description
When Calico is configured with the Azure IPAM plugin, the Calico CNI binary mutates the incoming CNI configuration to attach subnet information before delegating to the IPAM plugin. After mutating, the Azure IPAM helper logs the entire unmarshaled configuration map (stdinData) at INFO level to /var/log/calico/cni/cni.log on every CNI ADD and DEL invocation — once per pod scheduled or terminated on the node. When the cluster is deployed using token-based Kubernetes authentication, this log entry contains the ServiceAccount token, client key, and certificate authority in plaintext. Any principal with read access to /var/log/calico/cni/cni.log on a node can read these logs and extract the credentials, which grant cluster-wide Calico networking admin privileges.
Weakness: CWE-532
Which versions are affected by CVE-2026-41185?
6 open source packages ship an affected version, including github.com/projectcalico/calico and github.com/projectcalico/calico/v3. It affects 1 product.
| Package | Affected | Fixed in |
|---|---|---|
github.com/projectcalico/calico Go | All versions | 1.11.0-cni-plugin.0.20260417001138-cd73bc2cea0f |
github.com/projectcalico/calico Go | All versions | 1.11.0-cni-plugin.0.20260417001138-cd73bc2cea0f |
github.com/projectcalico/calico Go | All versions | 1.11.0-cni-plugin.0.20260417001138-cd73bc2cea0f |
github.com/projectcalico/calico Go | From 2.0.0 | 3.31.6 |
github.com/projectcalico/calico Go | From 2.0.0 | 3.31.6 |
github.com/projectcalico/calico/v3 Go | All versions | None |
Products include Tigera Calico.
How do I fix CVE-2026-41185?
Upgrade github.com/projectcalico/calico to a fixed version for your release line: 1.11.0-cni-plugin.0.20260417001138-cd73bc2cea0f or 3.31.6.
Is CVE-2026-41185 being exploited?
There is no known exploitation of CVE-2026-41185 in the wild and no public exploit code.
Other vulnerabilities in Tigera Calico
- CVE-2026-6540 L7 policy bypass via unnormalized HTTP path matching
- CVE-2026-41187 Calico Tier Authorization Bypass via DeleteCollection
- CVE-2026-41186 Unauthenticated Go pprof exposure in Calico debug server
- CVE-2026-41184 ServiceAccount token disclosure via install-cni container logs
- CVE-2022-28224 Calico and Calico Enterprise may be vulnerable to route hijacking with the floating IP feature
Sources
Also known as GHSA-m67g-87rx-v42c, GO-2026-5891, MINI-8mmx-x2c5-p8qv, MINI-cw38-3x25-p6qx, MINI-fhv4-88xw-vj9h, MINI-fv9p-j2c4-vwv2 and 2 more.