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TI-2025-33559 Aliases CVE-2025-53632GHSA-3gv2-v3jx-r9fh

Chall-Manager's scenario decoding process does not check for zip slips

Priority MEDIUM 40CWE-22Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub.

Summary

Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. When decoding a scenario (i.e. a zip archive), the path of the file to write is not checked, potentially leading to zip slips. Exploitation does not require authentication nor authorization, so anyone can exploit it. It should nonetheless not be exploitable as it is highly recommended to bury Chall-Manager deep within the infrastructure due to its large capabilities, so no users could reach the system. Patch has been implemented by commit 47d188f and shipped in v0.1.4.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00822 57th percentileScored 2026-11-07
Fix Fixed chall-manager (ctfer-io): 0.1.4github.com/ctfer-io/chall-manager (Go): 0.1.4

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-iochall-managerbefore 0.1.40.1.4Patch availableCNA
—github.com/ctfer-io/chall-manager (Go)before 0.1.40.1.4Patch availableGHSA-3gv2-v3jx-r9fh
  • chall-manager Vendorctfer-io Affected before 0.1.4 Fixed in 0.1.4 Patch available CNA
  • github.com/ctfer-io/chall-manager (Go) Vendor— Affected before 0.1.4 Fixed in 0.1.4 Patch available GHSA-3gv2-v3jx-r9fh

CPE configurations NVD · 1

CPEVersionsRoleVendor
cpe:2.3:a:ctfer-io:chall-manager:*:*:*:*:*:*:*:*before 0.1.4Vulnerablectfer-io
  • cpe:2.3:a:ctfer-io:chall-manager:*:*:*:*:*:*:*:* Versions before 0.1.4 Vulnerable ·ctfer-io

Remediation

  • Fix · CNA chall-manager (ctfer-io) Fixed in 0.1.4
  • Fix · GHSA-3gv2-v3jx-r9fh github.com/ctfer-io/chall-manager (Go) Fixed in 0.1.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-53632
  2. 2026-10-03 Alias added: GHSA-3gv2-v3jx-r9fh
  3. 2026-10-11 Priority changed: LOW → MEDIUM

References

Patch 1

Advisory 2

Other 2

  • 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-2026-25257 Chall-Manager's invalid NetworkPolicy enables a malicious actor to pivot into another namespace CVSS 4.0HIGH 7.9

Sources

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