Vulnerability · Published Jan 27, 2026 · Assigned by GitHub_M
CVE-2026-24479HUSTOJ has Arbitrary File Write (Zip Slip) in Problem Import Modules that leads to RCE
Critical 9.3
In plain English
A critical-severity path traversal in hustoj from zhblue. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 8.1% (higher than 95% of all known vulnerabilities). Ready-made attack tooling exists: Metasploit.
Official 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.
Affected products (as reported)
Weakness: CWE-22 · Vector: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N