CVE-2026-24479

HUSTOJ has Arbitrary File Write (Zip Slip) in Problem Import Modules that leads to RCE

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

zhblue · hustoj

CVSS v4.0 GITHUB

9.3 CRITICALCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X

CVSS v3.1 NVD

9.8 CRITICALCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

EPSS

8.25% chance of exploitation in the next 30 days, 95th percentile

Published

2026-01-27

Metasploit modules (1)

• rapid7/metasploit-framework/blob/master/modules/exploits/linux/http/hustoj_problem_import…

ExploitDB entries (1)

• https://www.exploit-db.com/exploits/52539

Security advisories

• zhblue/hustoj/security/advisories/GHSA-xmgg-2rw4-7fxj
• zhblue/hustoj/commit/902bd09e6d0011fe89cd84d4236899314b33101f

References

• CVE Record
• NVD entry