CVE-2026-102479

Published Oct 14, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed
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.

Remediation

No solution or workaround provided in the CVE record

Tracking

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Advisories

No advisories available
History
Type Values Removed Values Added
First Time appeared Eclipse Foundation
Eclipse Foundation vert.x
Vendors & Products Eclipse Foundation
Eclipse Foundation vert.x
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'}

Type Values Removed Values Added
Metrics ssvc

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

Type Values Removed Values Added
Title Vert.x HTTP/1.x Decoder Header Canonicalization Allows Request Smuggling
Weaknesses CWE-113
CWE-20
Type Values Removed Values Added
Weaknesses CWE-444
Type Values Removed Values Added
Title Vert.x HTTP/1.x Decoder Header Canonicalization Allows Request Smuggling
Weaknesses CWE-113
CWE-20
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'}

Weaknesses

Sources

Status
PUBLISHED
Assigner
eclipse
Published
Updated
Oct 28, 2026, 9:06 PM
Reserved
Sep 29, 2026, 8:57 AM
Status
Modified
Published
Oct 14, 2026, 7:17 PM
Modified
Oct 28, 2026, 9:16 PM