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CVE-2026-88777 is a network-reachable memory-overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway. It affects deployments using load-balancing or content-switching features, or CGNAT-LSN/NAT64, with a non-HTTP Layer 7 protocol enabled. Processing crafted traffic in the affected configuration can cause memory corruption, resulting in unpredictable or erroneous appliance behavior or denial of service.
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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.
13 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
A memory-overflow vulnerability that may cause unexpected behavior or service availability disruption.
A memory-overflow vulnerability in Citrix NetScaler ADC and Citrix NetScaler Gateway that can cause unpredictable or erroneous behavior or denial of service. The supplied CVSS v4 vector indicates network reachability, low attack complexity, no privileges or user interaction required, and high impact to availability.
A high-severity memory-overflow vulnerability that can cause unpredictable behavior, memory corruption, or denial of service in specified NetScaler deployments using non-HTTP Layer 7 protocol features.
A CVSS 8.8 memory-buffer bounds vulnerability (CWE-119) in Citrix NetScaler ADC and Gateway.
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.