CVE-2026-102479: eclipse vert.x

CVSS 8.7 (high) · published 2026-10-14

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.

Affected products (NVD): eclipse vert.x

Fixed in (NVD): 5.1.10

Weakness: CWE-444

Source: NVD CVE-2026-102479

References

• https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-ch7p-g5pm-3gqx
• https://gitlab.eclipse.org/security/cve-assignment/-/work_items/352
• http://www.openwall.com/lists/oss-security/2026/10/28/19

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