CVE-2026-28318

SolarWinds Serv-U exploited vulnerability, confirmed exploited in the wild.

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.

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48%chance of exploitation in the next 30 days (EPSS), 98th percentile

5 Junadded to CISA's Known Exploited Vulnerabilities list, 2026

19 Junfederal remediation deadline, already passed

Passedpast the deadline: patch now

CISA's name for it	SolarWinds Serv-U Uncontrolled Resource Consumption Vulnerability
Vendor and product	SolarWinds · Serv-U
Type	exploited vulnerability · CWE-400
Exploited	Confirmed by CISA listed 5 June 2026
Likelihood	one of the most likely to be exploited of every vulnerability tracked
Deadline	19 June 2026 · already passed
Used in ransomware	Not reported
Advisories	www.solarwinds.com ↗ · documentation.solarwinds.com ↗ · nvd.nist.gov ↗

What to do

Three steps, in this order

Step 1

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited.

Step 2

If you cannot patch now, restrict network access to the affected product.

Step 3

Check for signs of compromise since the date it was added to the list.

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.

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Questions

CVE-2026-28318 in short

Is CVE-2026-28318 being exploited?

Yes. CISA added CVE-2026-28318 to its Known Exploited Vulnerabilities catalogue on 5 June 2026, which it does only on evidence of exploitation in the wild.

What is the CISA deadline for CVE-2026-28318?

US federal agencies must remediate it by 19 June 2026. Everyone else should treat that date as the latest safe point to patch an internet-facing system.

How likely is CVE-2026-28318 to be exploited in the next 30 days?

FIRST's Exploit Prediction Scoring System gives it 48%, the 98th percentile of every CVE it scores.

How do I fix CVE-2026-28318?

Apply the vendor's fix or mitigation; CISA lists only vulnerabilities seen exploited. If you cannot patch now, restrict network access to the affected product. Check for signs of compromise since the date it was added to the list.

Same vendor

Other SolarWinds vulnerabilities being exploited

CVE	Product	Type	Listed
CVE-2025-26399	Web Help Desk	insecure deserialization	9 March 2026
CVE-2025-40536	Web Help Desk	exploited vulnerability	12 February 2026
CVE-2025-40551	Web Help Desk	remote code execution	3 February 2026

Sources: CISA Known Exploited Vulnerabilities catalogue (released 10 November 2026) and FIRST EPSS. Page compiled automatically by SAK T.L.M, the threat-intelligence tool of SAK T.E.C, on 13 November 2026.