CVE-2026-28318: SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
CVE-2026-28318 is a Severity not scored in source feed flaw in SolarWinds Serv-U. 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. It is listed in the CISA Known Exploited Vulnerabilities catalog (added 2026-06-05), meaning it is being actively exploited. The fix: Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
Source: CISA Known Exploited Vulnerabilities Catalog. Data as of 2026-06-13.
Vulnerability details
| Field | Value |
|---|---|
| CVE ID | CVE-2026-28318 |
| Vulnerability | SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability |
| Vendor / product | SolarWinds — Serv-U |
| CVSS base score | Not in source feed |
| Severity | — |
| Weakness (CWE) | CWE-400 |
| Added to CISA KEV | 2026-06-05 |
| CISA remediation due | 2026-06-19 |
| Known ransomware use | Unknown |
Source: CISA Known Exploited Vulnerabilities Catalog. Data as of 2026-06-13.
What is the risk?
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.
How to remediate CVE-2026-28318
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
U.S. federal civilian agencies were required to remediate this vulnerability by 2026-06-19 under CISA Binding Operational Directive 22-01. Private organizations should treat it with comparable urgency.
References
Frequently asked questions
What is CVE-2026-28318?
CVE-2026-28318 is a vulnerability in SolarWinds Serv-U: 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.
How severe is CVE-2026-28318?
The CISA KEV catalog does not publish a CVSS base score for this entry. Check the NVD record for the official score. Its presence in the KEV catalog means it is confirmed to be exploited in the wild.
Is CVE-2026-28318 being exploited in the wild?
Yes. It appears in the CISA Known Exploited Vulnerabilities (KEV) catalog, which only lists vulnerabilities with reliable evidence of active exploitation. It was added on 2026-06-05.
How do I fix CVE-2026-28318?
Apply mitigations per vendor instructions, follow applicable BOD 22-01 guidance for cloud services, or discontinue use of the product if mitigations are unavailable.
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Last updated: 2026-06-13