CVE-2026-24479
Critical
Description
HUSTOF is an open source online judge based on PHP/C++/MySQL/Linux for ACM/ICPC and NOIP training. Prior to version 26.01.24, the problem_import_qduoj.php and problem_import_hoj.php modules fail to properly sanitize filenames within uploaded ZIP archives. Attackers can craft a malicious ZIP file containing files with path traversal sequences (e.g., ../../shell.php). When extracted by the server, this allows writing files to arbitrary locations in the web root, leading to Remote Code Execution (RCE). Version 26.01.24 contains a fix for the issue.
SeverityCritical
CVSS9.8
Exploit probability—
ProductHustoj
PublishedJan 27, 2026
First seenJan 27, 2026
Weakness typeCWE-22Path traversal
How to fix
Update
- hustoj hustoj26.01.24 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| hustoj hustoj | v < 26.01.24 | 26.01.24 |
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