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CVE-2026-28367 is an HTTP request smuggling flaw in Undertow caused by improper handling of a malformed header block terminator. A remote attacker can send \r\r\r as the header block terminator, creating a parsing discrepancy between Undertow and certain front-end proxy servers. In affected deployments, this inconsistency can cause the proxy and backend to disagree on request boundaries, enabling request smuggling. The issue is specifically noted in environments using certain proxy servers, including older versions of Apache Traffic Server and Google Cloud Classic Application Load Balancer.
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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.
8 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
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.