What’s Vulnerable › Vulnerabilities

CVE-2026-32769: Fullchain's Invalid NetworkPolicy enables a malicious actor to pivot into another namespace

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.5% probability of exploitation in the next 30 days
• Public exploit or detection template: yes
• Published: 2026-03-20 · updated 2026-06-17
• Weakness: CWE-284

Description

Fullchain is an umbrella project for deploying a ready-to-use CTF platform. In versions prior to 0.1.1, due to a mis-written NetworkPolicy, a malicious actor can pivot from a subverted application to any Pod out of the origin namespace. The flawed inter-ns NetworkPolicy breaks the security-by-default property expected as part of the deployment program, leading to a potential lateral movement. This issue has been fixed in version 0.1.1. To workaround, delete the failing network policy that should be prefixed by inter-ns- in the target namespace.

Affected products

• ctfer-io fullchain: before 0.1.1 — fixed in 0.1.1

How to fix

Upgrade to a fixed version: ctfer-io fullchain 0.1.1. Check the vendor advisory for mitigations.

References

• https://github.com/ctfer-io/fullchain/commit/dbcb90178bcb07a3f5a1efa4c6350f3a6ce34f51
• https://github.com/ctfer-io/fullchain/releases/tag/v0.1.1
• https://github.com/ctfer-io/fullchain/security/advisories/GHSA-hxm7-9q36-c77f

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