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CVE-2026-19489 is a memory-overflow vulnerability in customer-managed NetScaler ADC and NetScaler Gateway appliances. The vulnerability affects the Large Scale NAT (LSN) SIP Application Layer Gateway (SIP ALG) configuration path and applies only when SIP ALG is enabled on an LSN group. Affected releases include NetScaler ADC and Gateway 14.1 before 14.1-73.32 and 13.1 before 13.1-63.21, including applicable FIPS and NDcPP editions.
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What it means. What to do now. Patch path, mitigations, and the assume-compromise checklist.
What an attacker gets, and what they’ve been doing with it.
If you can’t patch tonight, do this now.
Patch, then assume compromise.
No public exploits tracked yet. Mallory keeps watching.
No public exploit code observed for this vulnerability.
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.
56 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A previously disclosed NetScaler vulnerability mentioned only to clarify that it is unrelated to the two actively exploited zero-days discussed in the article.
A previously disclosed Citrix NetScaler vulnerability referenced solely as unrelated context for the two newly exploited zero-days.
A Citrix NetScaler vulnerability disclosed in August; the content provides no technical or exploitation details.
Previously disclosed Citrix NetScaler ADC and NetScaler Gateway vulnerability unrelated to the two reported zero-days.
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.