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.
Published: 2026-10-14
Score: 8.7 High
EPSS: < 1% Very Low
KEV: No
AI Analysis

Analysis and contextual insights are available on OpenCVE Cloud.

Remediation

No solution or workaround provided in the CVE record.

Additional remediation guidance may be available on OpenCVE Cloud.

Tracking

Sign in to view the affected projects.

Advisories

No advisories yet.

History

Tue, 20 Oct 2026 19:45:00 +0000

Type Values Removed Values Added
First Time appeared Eclipse
Eclipse vert.x
CPEs cpe:2.3:a:eclipse:vert.x:*:*:*:*:*:*:*:*
cpe:2.3:a:eclipse:vert.x:5.2.0:*:*:*:*:*:*:*
Vendors & Products Eclipse
Eclipse vert.x
Metrics cvssV3_1

{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}


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'}


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 : Analyzed

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

Modified: 2026-10-20T19:31:59.240

Link: CVE-2026-102479

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

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

Weaknesses