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CVE-2026-11541 is an HTTP request smuggling vulnerability affecting IBM WebSphere Application Server 9.0 and 8.5, and IBM WebSphere Application Server Liberty versions 17.0.0.3 through 26.0.0.6. The issue arises from improper handling of ambiguous or inconsistently parsed HTTP requests, allowing a crafted request to be interpreted differently by chained HTTP components such as front-end proxies, load balancers, or the application server. This parser discrepancy can permit an attacker to smuggle a secondary request within a seemingly valid primary request, causing the back-end server to process unintended traffic out of sequence.
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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.
10 sources tracked across advisories and community write-ups. News coverage will land here when it surfaces.
No news coverage yet. Advisories and community discussion only.
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.