Denial of Service in NetScaler ADC and NetScaler Gateway via malformed HTTP/2 requests
CVE-2026-13474 is a high-severity denial-of-service vulnerability in Citrix NetScaler ADC and NetScaler Gateway. The issue is described as a missing release of memory after effective lifetime, resulting in a memory leak condition that can be triggered by malformed HTTP/2 requests. The vulnerability is present when HTTP/2 is enabled in an HTTP Profile that is associated with a NetScaler virtual server of type LB, CS, or VPN, or with a service configured on NetScaler. Repeated malformed HTTP/2 traffic can exhaust resources on the appliance and cause service disruption.
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Impact, mitigation & remediation
What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
Impact
What an attacker gets, and what they’ve been doing with it.
Mitigation
If you can’t patch tonight, do this now.
Remediation
Patch, then assume compromise.
Exploits
No valid public exploits. Mallory filtered out 1 candidate as fakes, detection scripts, or README-only repos.
All candidate exploits were filtered out by Mallory's validation.
Affected products & vendors
Products and vendors Mallory has correlated with this vulnerability. Open in Mallory to drill down to specific CPE configurations and version ranges.
Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
Recent activity
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A high-severity vulnerability in Citrix NetScaler ADC and NetScaler Gateway related to improper memory handling and insufficient input validation that can be exploited to cause denial-of-service or memory overflow conditions.
The NetScaler-specific tracking identifier for the HTTP/2 Bomb denial-of-service issue affecting NetScaler deployments.
A memory management vulnerability in Citrix NetScaler that can be exploited with malformed HTTP/2 requests to cause denial of service when HTTP/2 is enabled.
A critical vulnerability addressed by Citrix in NetScaler ADC, NetScaler Gateway, and related FIPS/NDcPP editions.
The version that knows your environment.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.