CVE-2024-23826: spbu se site DoS — Exploit & Fix

Description

spbu_se_site is the website of the Department of System Programming of St. Petersburg State University. Before 2024.01.29, when uploading an avatar image, an authenticated user may intentionally use a large Unicode filename which would lead to a server-side denial of service under Windows. This is due to no limitation of the length of the filename and the costly use of the Unicode normalization with the form NFKD on Windows OS. This vulnerability was fixed in the 2024.01.29 release.

Is your site exposed to CVE-2024-23826?

Run a free security scan — no signup, results in seconds.

CVSS v3.1 Score

6.8

MEDIUM

CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:L/I:L/A:H

Weakness Type (CWE)

CWE-770 CWE-770

Affected Products

Vendor	Product	Versions
se.math.spbu	spbu_se_site	< 2024.01.29

References

Advisories & Patches

https://github.com/spbu-se/spbu_se_site/commit/5ad623eb0405260763046343c5785bc588d8a57d https://github.com/spbu-se/spbu_se_site/commit/5ad623eb0405260763046343c5785bc588d8a57d

Exploits

https://github.com/spbu-se/spbu_se_site/security/advisories/GHSA-5vfc-v7hg-pvwm https://github.com/spbu-se/spbu_se_site/security/advisories/GHSA-5vfc-v7hg-pvwm

Frequently Asked Questions

What is CVE-2024-23826? +

spbu_se_site is the website of the Department of System Programming of St. Petersburg State University. Before 2024.01.29, when uploading an avatar image, an authenticated user may intentionally use a large Unicode filename which would lead to a server-side denial of service under Windows. This is due to no limitation of the length of the filename and the costly use of the Unicode normalization with the form NFKD on Windows OS. This vulnerability was fixed in the 2024.01.29 release. It has a CVSS v3.1 base score of 6.8 (MEDIUM).

How severe is CVE-2024-23826? +

CVE-2024-23826 has a CVSS v3.1 score of 6.8 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2024-23826? +

CVE-2024-23826 affects products from se.math.spbu, specifically: spbu_se_site. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2024-23826? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

Related Vulnerabilities

CVE-2026-39313

mcp-framework is a framework for building Model Context Protocol (MCP) servers. In versions 0.2.21 and below, the readRequestBody() function in …

CVE-2026-35469

spdystream is a Go library for multiplexing streams over SPDY connections. In versions 0.5.0 and below, the SPDY/3 frame parser …

CVE-2026-39803

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion. …

CVE-2026-39804

Allocation of Resources Without Limits or Throttling vulnerability in mtrudel bandit allows unauthenticated remote denial of service via memory exhaustion …

CVE-2026-32688

Allocation of Resources Without Limits or Throttling vulnerability in elixir-plug plug_cowboy allows unauthenticated remote denial of service via atom table …

CVE-2026-10573

A denial-of-service security issue exists in 1734 POINT I/O™ module. The security issue stems from improper handling of crafted CIP …

CVE-2024-23826