Path Traversal in Hustoj
CVE-2026-24479
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.
Vulnerability class: Path Traversal (Directory Traversal)
EPSS: 0.079 (94.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.
Affected products
- Hustoj
- Zhblue Hustoj — versions < 26.01.24
Weakness classification (CWE)
Public proof-of-concept exploits
References
- security-advisories@github.com (x_refsource_CONFIRM, Vendor Advisory)
- security-advisories@github.com (Patch, x_refsource_MISC)
Frequently asked questions
- What is CVE-2026-24479?
- CVE-2026-24479 is a critical-severity vulnerability in Hustoj, classified under Path Traversal. CVSS score: 9.8/10. Published 2026-01-27.
- How severe is CVE-2026-24479?
- Critical severity. CVSS v3 base score is 9.8 out of 10.
- Is CVE-2026-24479 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.