by Kastro
Paper/Archive/CVE-2026-32769

CVE-2026-32769

ctfer-io fullchain — Fullchain's Invalid NetworkPolicy enables a malicious actor to pivot into another namespace

EPSS 0.5%CVSS 9.8
critical.is priorityof 100
38
CVSS 9.8 (NVD)9.8 / 10 × 3029.4Not in CISA KEV+300.0EPSS percentile 43.5.435 × 208.7No public exploit+100.0SSVC exploitation: none+100.0
Description · from the CVE record

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

ProductAffectedFixed inSource
fullchain< 0.1.1–CNA

Scores by source

NVD9.8CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GitHub_M (CNA)7.1CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:N/SC:H/SI:H/SA:H
CISA ADPSSVCExploitation: none · Automatable: no · Technical impact: partial

References

refgithub.com/ctfer-io/fullchain/security/advisories/GHSA-hxm7-9q36-c77frefgithub.com/ctfer-io/fullchain/commit/dbcb90178bcb07a3f5a1efa4c6350f3a6ce34f51refgithub.com/ctfer-io/fullchain/releases/tag/v0.1.1