Read the docs
TI-2026-25258 Aliases CVE-2026-32769GHSA-hxm7-9q36-c77f

Fullchain's Invalid NetworkPolicy enables a malicious actor to pivot into another namespace

Priority LOW 32CWE-284Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Attack requirements
Present
Impact type
Security bypass
Confidentiality · integrity · availability
None · None · None
Fix status
Fixed

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-284.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00521 44th percentileScored 2026-11-07
Public exploit Yes 1 exploit referenceTagged by NVD
Fix Fixed fullchain (ctfer-io): 0.1.1github.com/ctfer-io/fullchain (Go): 0.1.1

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
No
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
ctfer-iofullchainbefore 0.1.10.1.1Patch availableCNA
—github.com/ctfer-io/fullchain (Go)before 0.1.10.1.1Patch availableGHSA-hxm7-9q36-c77f
  • fullchain Vendorctfer-io Affected before 0.1.1 Fixed in 0.1.1 Patch available CNA
  • github.com/ctfer-io/fullchain (Go) Vendor— Affected before 0.1.1 Fixed in 0.1.1 Patch available GHSA-hxm7-9q36-c77f

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ctfer:fullchain:*:*:*:*:*:go:*:*before 0.1.1VulnerableCtfer
  • cpe:2.3:a:ctfer:fullchain:*:*:*:*:*:go:*:* Versions before 0.1.1 Vulnerable ·Ctfer

Remediation

  • Fix · CNA fullchain (ctfer-io) Fixed in 0.1.1
  • Fix · GHSA-hxm7-9q36-c77f github.com/ctfer-io/fullchain (Go) Fixed in 0.1.1 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2026-32769
  2. 2026-10-03 Alias added: GHSA-hxm7-9q36-c77f
  3. 2026-10-18 EPSS moved to the 50th–90th percentile
  4. 2026-10-25 EPSS moved to the below the 50th percentile

References

Exploit 1

Patch 1

Advisory 1

Other 2

  • TI-2026-25275 Romeo is vulnerable to Archive Slip due to missing checks in sanitization CVSS 4.0HIGH 8.3
  • TI-2026-25260 Monitoring is vulnerable to Archive Slip due to missing checks in sanitization CVSS 4.0HIGH 8.8
  • TI-2025-33561 Chall-Manager's HTTP Gateway have no header check timeout leading to potential slow loris attacks CVSS 4.0HIGH 8.7
  • TI-2025-33560 Chall-Manager's scenario decoding process does not check for zip bombs CVSS 4.0HIGH 8.7
  • TI-2026-25229 Romeo's invalid NetworkPolicy enables a malicious actor to pivot into another namespace CVSS 4.0HIGH 7.9
  • TI-2026-25257 Chall-Manager's invalid NetworkPolicy enables a malicious actor to pivot into another namespace CVSS 4.0HIGH 7.9
See all 9 →

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences