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TI-2025-33561 Aliases CVE-2025-53634GHSA-ggmv-j932-q89q

Chall-Manager's HTTP Gateway have no header check timeout leading to potential slow loris attacks

Priority MEDIUM 44CWE-770Published · Updated

Key facts

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

Attack profile from CVSS 4.0 · CNA. Fix status from CNA and GitHub. Impact type from CWE-770.

Summary

Chall-Manager is a platform-agnostic system able to start Challenges on Demand of a player. The HTTP Gateway processes headers, but with no timeout set. With a slow loris attack, an attacker could cause Denial of Service (DoS). 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 1385bd8 and shipped in v0.1.4.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.00508 43rd 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
Yes
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-ggmv-j932-q89q
  • 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-ggmv-j932-q89q

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-ggmv-j932-q89q github.com/ctfer-io/chall-manager (Go) Fixed in 0.1.4 Advisory →

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-53634
  2. 2026-10-03 Alias added: GHSA-ggmv-j932-q89q

References

Patch 1

Advisory 2

Other 2

  • 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
  • TI-2025-33559 Chall-Manager's scenario decoding process does not check for zip slips CVSS 4.0HIGH 8.8

Sources

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