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CVE-2026-14180

5.3 medium SSVC exploitation: none Published
NVD · CVE.org

A flaw was found in the ChunkReader component of the Undertow HTTP server, which is used by WildFly and JBoss EAP to handle chunked transfer encoding. The issue occurs because the parser uses a single internal variable to store both the remaining chunk size and state flags. By sending a specially crafted request with an extremely large chunk size, an attacker can cause these values to overlap, tricking the parser into thinking a request has finished prematurely. This can allow a second, "smuggled" request to be processed out of sync, potentially bypassing security controls.

Fix

Nothing published yet: no patch, vendor advisory or mitigation reference on NVD, no vendor advisory in the News for this CVE, not in CISA's KEV, no fixed package version. BaselineWatch does not guess at one.

Change history 2

  1. StatusAwaiting Analysis → PublishedNVD modified 2026-10-20 14:18
  2. First seenCVSS 5.3NVD modified 2026-10-20 15:17

Affected (CPE criteria) 0

NVD has not attached CPE configurations yet.

References 6