How severe is CVE-2026-24479?

CVE-2026-24479 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.

Is CVE-2026-24479 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-24479?

CVE-2026-24479 affects Hustoj. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-24479?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-24479 have an EU (EUVD) identifier?

Yes. CVE-2026-24479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4836.

When was CVE-2026-24479 published?

CVE-2026-24479 was published on 2026-01-27 and last updated on 2026-06-17.

CVE-2026-24479

CVE-2026-24479 is a critical-severity vulnerability in Hustoj with a CVSS 3.x base score of 9.8. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-22.

Key facts

Severity: Critical (CVSS 3.x base score 9.8)
CVSS v4: 9.3
EPSS exploit prediction: 8% (94th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-4836
Weakness: CWE-22
Affected product: Hustoj
Published: 2026-01-27
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-24479?: CVE-2026-24479 has a CVSS 3.x base score of 9.8, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is high, integrity high, and availability high.
Is CVE-2026-24479 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 8% (94th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-24479?: CVE-2026-24479 affects Hustoj. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-24479?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-24479 have an EU (EUVD) identifier?: Yes. CVE-2026-24479 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-4836.
When was CVE-2026-24479 published?: CVE-2026-24479 was published on 2026-01-27 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:hustoj:hustoj:*:*:*:*:*:*:*:*

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