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

criticalknown exploitedpublic exploitCVE-2026-28318
Actively exploited. At least one CVE in this advisory is listed in the CISA Known Exploited Vulnerabilities catalog — exploitation has been observed in the wild. Treat remediation as urgent.
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.

CSIRTS triage

vendor: SolarWindsproduct: Serv-UDenial of service
What
The vulnerability allows specially crafted POST requests to crash the Serv-U service without authentication.
Who is affected
Deployments of SolarWinds Serv-U that process POST requests with the specified header.
Urgency
Urgent remediation is necessary due to active exploitation and critical impact on service availability.
Action
Implement the latest updates from SolarWinds to fix the vulnerability.

AI-assisted analysis generated from the source advisory — verify against the original.

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Details

Source
CISA Known Exploited Vulnerabilities (US · database · site)
Severity
critical
Published
2026-06-05
Exploitation
Observed in the wild (CISA KEV)

Original advisory: https://nvd.nist.gov/vuln/detail/CVE-2026-28318

Exploitation outlook

EPSS (FIRST.org) estimates each CVE’s probability of exploitation in the next 30 days — here is the CSIRTS.com read on those numbers.

Referenced CVEs

CVECSIRTS overviewExternal
CVE-2026-28318coverage & exploitation statusNVD · CVE.org

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