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CVE-2026-8646 is an HTTP request smuggling vulnerability in IBM WebSphere Application Server 8.5 and 9.0 and IBM WebSphere Application Server Liberty 17.0.0.3 through 26.0.0.6. The flaw results from inconsistent interpretation of HTTP request length headers when requests traverse an intermediary proxy or load balancer before reaching the application server. In Liberty, exposure applies when supported Servlet or WebSocket features are enabled.
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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.
7 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Una vulnerabilidad de HTTP Request Smuggling en IBM WebSphere Application Server causada por interpretación inconsistente de cabeceras de longitud en peticiones HTTP a través de proxies o balanceadores.
An HTTP request smuggling vulnerability in IBM WebSphere Application Server and WebSphere Application Server Liberty that could allow attackers to bypass security controls, spoof identity, escalate privileges, and expose sensitive information.
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.