ET WEB_SPECIFIC_APPS Citrix Netscaler SAML IDP Memory Overread - NSC_TASS Cookie Response (CVE-2026-3055)

Query · suricata

flow:established,to_client;
flowbits:isset,ET.Citrix_NS.CVE_2026_3055;
http.cookie;
content:"NSC_TASS|3d|"; fast_pattern;
target:src_ip;

Rule dependencies

⚠ Higher-order rule. It fires on other rules' alerts, not on raw events, so it cannot fire on its own. Deploy the rules it depends on too.

Depends on

Raw source ET WEB_SPECIFIC_APPS Citrix Netscaler SAML IDP Memory Overread - NSC_TASS Cookie Response (CVE-2026-3055) · Suricata
Esc
Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http $HOME_NET any -> $EXTERNAL_NET any (
    msg:"ET WEB_SPECIFIC_APPS Citrix Netscaler SAML IDP Memory Overread - NSC_TASS Cookie Response (CVE-2026-3055)";
    flow:established,to_client;
    flowbits:isset,ET.Citrix_NS.CVE_2026_3055;
    http.cookie;
    content:"NSC_TASS|3d|"; fast_pattern;
    reference:url,labs.watchtowr.com/the-sequels-are-never-as-good-but-were-still-in-pain-citrix-netscaler-cve-2026-3055-memory-overread/;
    reference:cve,2026-3055;
    classtype:web-application-attack;
    sid:2068633; rev:1;
    metadata:affected_product Citrix, attack_target Networking_Equipment, tls_state TLSDecrypt, created_at 2026_04_08, cve CVE_2026_3055, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence High, signature_severity Major, updated_at 2026_04_08;
    target:src_ip;
)

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