Vulnerability · Published Jul 10, 2025 · Assigned by GitHub_M
CVE-2025-53633Chall-Manager's scenario decoding process does not check for zip bombs
High 8.7
In plain English
A high-severity security flaw in chall-manager from ctfer-io. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 45% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Official description
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 size of the decoded content is not checked, potentially leading to zip bombs decompression. 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 14042aa and shipped in v0.1.4.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | github.com/ctfer-io/chall-manager | 0.1.4 | GHSA-r7fm-3pqm-ww5w |
| Go | github.com/ctfer-io/chall-manager | 0.1.4 | GO-2025-3810 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| ctfer-io | chall-manager | < 0.1.4 |
Weakness: CWE-405 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N