CVE-2026-28318 PUBLISHED

SolarWinds Serv-U is susceptible to specially crafted POST requests that crash the Serv-U service without authentication using Content-Encoding: deflate. Mitigation steps are provided to secure customer environments in the SolarWinds Trust Center if you are unable to deploy the update

Block any POST requests containing 'Content-Encoding: deflate'. This function is not required for SolarWinds Serv-U.

Upgrade to SolarWinds Serv-U 15.5.4 Hotfix 1. Use the mitigation steps until the upgrade is possible.

• https://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318
• https://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm

• CWE-400 Uncontrolled Resource Consumption CWE

• CAPEC-469 HTTP DoS