ET WEB_SPECIFIC_APPS Alibaba fastjson2 Remote Code Execution (CVE-2026-16723)

Query · suricata

flow:established,to_server;
http.content_type;
content:"application/json";
http.request_body; strip_whitespace;
content:"|22 40|type|22 3a 22|"; fast_pattern;
pcre:"/^(?:jar\x3a)?[a-z]+?\x3a\x2f{2}/R";
http.method;
content:"POST";
target:dest_ip;
Raw source ET WEB_SPECIFIC_APPS Alibaba fastjson2 Remote Code Execution (CVE-2026-16723) · Suricata
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Published by Emerging Threats Open ↗, licensed under BSD 3-Clause ↗. Line breaks added for readability; the rule is otherwise unchanged. 
alert http any any -> [$HOME_NET,$HTTP_SERVERS] any (
    msg:"ET WEB_SPECIFIC_APPS Alibaba fastjson2 Remote Code Execution (CVE-2026-16723)";
    flow:established,to_server;
    http.content_type;
    content:"application/json";
    http.request_body; strip_whitespace;
    content:"|22 40|type|22 3a 22|"; fast_pattern;
    pcre:"/^(?:jar\x3a)?[a-z]+?\x3a\x2f{2}/R";
    http.method;
    content:"POST";
    reference:url,fearsoff.org/research/fastjson-1-2-83-rce;
    reference:cve,2026-16723;
    classtype:web-application-attack;
    sid:2071344; rev:1;
    metadata:attack_target Server, tls_state TLSDecrypt, created_at 2026_07_29, cve CVE_2026_16723, deployment Perimeter, deployment Internal, deployment SSLDecrypt, confidence Medium, signature_severity Major, tag Exploit, updated_at 2026_07_29, mitre_tactic_id TA0001, mitre_tactic_name Initial_Access, mitre_technique_id T1190, mitre_technique_name Exploit_Public_Facing_Application;
    target:dest_ip;
)

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