CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
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.
| Vendor | SolarWinds |
|---|---|
| Product | Serv-U |
| Date added to KEV | 2026-06-05 |
| Due date (BOD 22-01) | 2026-06-19 |
| Known ransomware campaign use | Unknown |
| CWE | CWE-400 |
| Required action | Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable. |
What to do
- Identify every instance of SolarWinds Serv-U in your environment (asset inventory, EDR, vulnerability scanner).
- Apply CISA's required action: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
- Federal civilian agencies must act by 2026-06-19 under BOD 22-01; other organizations can use the same date as a target.
- Check the vendor advisory and NVD entry linked below for affected versions, then record the fix in your change log.
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Sources
- NVD entry for CVE-2026-28318 (severity scores, if any, live there)
- CISA KEV catalog entry
- 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#link7
- https://nvd.nist.gov/vuln/detail/CVE-2026-28318