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CVE-2025-48866

Possible DoS vulnerability in sanitiseArg action

Severity
High 7.5
Published
2 Jun 2025
Last changed
17 Jun 2026
Added to UpHeron
1 Nov 2026
Fixed in
2.9.9, 2.9.10
Also known as
GHSA-f82j-8pp7-cw2w
Sources
NVD, Project advisories (GitHub)

Description

ModSecurity is an open source, cross platform web application firewall (WAF) engine for Apache, IIS and Nginx. Versions prior to 2.9.10 contain a denial of service vulnerability similar to GHSA-859r-vvv8-rm8r/CVE-2025-47947. The `sanitiseArg` (and `sanitizeArg` - this is the same action but an alias) is vulnerable to adding an excessive number of arguments, thereby leading to denial of service.…

Affected software

SoftwareAffected versions
ModSecurityServers and applications · cpe:a:owasp:modsecurity
  • Every version before 2.9.10
ModSecurityServers and applications · github:owasp-modsecurity/modsecurity
  • Every version before 2.9.9

References

  • NVD https://nvd.nist.gov/vuln/detail/CVE-2025-48866
  • CVE.org https://www.cve.org/CVERecord?id=CVE-2025-48866
  • GitHub Advisory Database https://github.com/advisories/GHSA-f82j-8pp7-cw2w
  • github.com https://github.com/owasp-modsecurity/ModSecurity/security/advisories/GHSA-f82j-8pp7-cw2w