In Eclipse Vert.x versions [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Vert.x HTTP/1.x decoder uses a canonicalization for well known HTTP headers, the canonicalization process interprets well crafted headers as headers of this list, allowing for instance Content-Xength to be interpeted as Content-Length.



This can be exploited for request smuggling purpose.



The impacted component is io.vertx:vertx-core.
Advisories

No advisories yet.

Fixes

Solution

No solution given by the vendor.


Workaround

No workaround given by the vendor.

History

Sat, 17 Oct 2026 13:30:00 +0000

Type Values Removed Values Added
Metrics ssvc

{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}


Fri, 16 Oct 2026 23:15:00 +0000

Type Values Removed Values Added
Title Vert.x HTTP/1.x Decoder Header Canonicalization Allows Request Smuggling
Weaknesses CWE-113
CWE-20

Fri, 16 Oct 2026 19:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-444

Thu, 15 Oct 2026 14:00:00 +0000

Type Values Removed Values Added
Title Vert.x HTTP/1.x Decoder Header Canonicalization Allows Request Smuggling
Weaknesses CWE-113
CWE-20

Wed, 14 Oct 2026 19:00:00 +0000

Type Values Removed Values Added
Description In Eclipse Vert.x versions [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], the Vert.x HTTP/1.x decoder uses a canonicalization for well known HTTP headers, the canonicalization process interprets well crafted headers as headers of this list, allowing for instance Content-Xength to be interpeted as Content-Length. This can be exploited for request smuggling purpose. The impacted component is io.vertx:vertx-core.
References
Metrics cvssV4_0

{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:H/VA:N/SC:N/SI:N/SA:N'}


Projects

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cve-icon MITRE

Status: PUBLISHED

Assigner: eclipse

Published:

Updated: 2026-10-16T18:23:47.949Z

Reserved: 2026-09-29T08:57:24.202Z

Link: CVE-2026-102479

cve-icon Vulnrichment

Updated: 2026-10-16T18:23:40.298Z

cve-icon NVD

Status : Undergoing Analysis

Published: 2026-10-14T19:17:05.313

Modified: 2026-10-16T19:17:01.130

Link: CVE-2026-102479

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

Updated: 2026-10-17T01:00:14Z

Weaknesses