CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability

Summary

SolarWinds Serv-U contains an uncontrolled resource consumption vulnerability that allows specially crafted POST requests using the Content-Encoding: deflate header to crash the Serv-U service without authentication.

Remediation

Inventory every SolarWinds Serv-U deployment, including staging.
No fixed version appears in the public sources yet. Check the references below and the vendor directly.
Review logs from before the change for signs of exploitation.

CISA required actionApply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.

References

Advisoryhttps://www.solarwinds.com/trust-center/security-advisories/cve-2026-28318
Advisoryhttps://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm#link7
Advisoryhttps://nvd.nist.gov/vuln/detail/CVE-2026-28318
Referencehttps://www.solarwinds.com/trust-center/security-advisories/CVE-2026-28318
Referencehttps://documentation.solarwinds.com/en/success_center/servu/content/release_notes/servu_15-5-4-hotfix-1_release_notes.htm
Referencehttps://www.cisa.gov/known-exploited-vulnerabilities-catalog?field_cve=CVE-2026-28318