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CVE-2026-19489 is a network-reachable memory overflow vulnerability in NetScaler ADC and NetScaler Gateway. It affects NetScaler ADC and Gateway 14.1 through 14.1-73.32 and 13.1 through 13.1-63.21. The flaw can be triggered without privileges or user interaction and is described as causing unpredictable behavior or denial of service. Available information indicates exploitation is associated with configurations involving SIP ALG on an LSN group, suggesting the vulnerable code path is exposed when that feature set is enabled. Publicly available details do not identify the exact vulnerable function or parsing routine.
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No public exploit code observed for this vulnerability.
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A vulnerability addressed in a Citrix security bulletin affecting NetScaler ADC and NetScaler Gateway products, including specified NetScaler ADC/FIPS/NDcPP versions.
A vulnerability affecting NetScaler ADC and NetScaler Gateway products, including NetScaler ADC FIPS and NetScaler ADC FIPS and NDcPP, in specified vulnerable versions.
A memory overflow vulnerability in NetScaler ADC and NetScaler Gateway that can cause denial-of-service or unstable appliance behavior when SIP ALG is enabled in an LSN group configuration.
A memory overflow vulnerability in Citrix NetScaler ADC and NetScaler Gateway that can cause service disruption or other unpredictable behavior. Exploitation depends on specific NetScaler configuration involving an lsn group with sipalg.
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.