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CVE-2026-102479

• Severity: medium (CVSS 5.9 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-10-14 · updated 2026-10-28
• Weakness: CWE-444

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.

Affected products

• Eclipse Foundation Eclipse Vert.x: from 5.0.0 before 5.1.10; 5.2.0 (and their updates) — fixed in 5.1.10
• Eclipse Foundation Eclipse Vert.x: from 5.0.0 through 5.0.12; from 5.1.0 through 5.1.9; 5.2.0

How to fix

Upgrade to a fixed version: Eclipse Foundation Eclipse Vert.x 5.1.10. Check the vendor advisory for mitigations.

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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