--- title: "CVE-2026-102479: Eclipse Vert.x - HTTP Request Smuggling" description: "Eclipse Vert.x 5.0.0 to 5.0.12, 5.1.0 to 5.1.9, and 5.2.0 contains an HTTP request smuggling vulnerability caused by improper canonicalization of HTTP/1.x headers in io.vertx:vertx-core, letting attackers perform request smuggling via crafted headers." url: https://panop.io/threat-heartbeat/CVE-2026-102479/ --- # CVE-2026-102479 Eclipse Vert.x - HTTP Request Smuggling Eclipse Vert.x 5.0.0 to 5.0.12, 5.1.0 to 5.1.9, and 5.2.0 contains an HTTP request smuggling vulnerability caused by improper canonicalization of HTTP/1.x headers in io.vertx:vertx-core, letting attackers perform request smuggling via crafted headers. CVSS base score 8.7 /10 High CISA KEV Not listed Public exploit None known Authentication Not required [View the NVD record ↗](https://nvd.nist.gov/vuln/detail/CVE-2026-102479) ## Details Type HTTP Request Smuggling Impact HTTP Request Smuggling CVSS 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/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X Published 14 October 2026 Updated 15 October 2026 ## Vendor fix Update to a version later than 5.2.0 or the latest available version. Patching closes this CVE. It does not tell you which of your systems run the affected version, or what else is exposed alongside them. ## References - [https://nvd.nist.gov/vuln/detail/CVE-2026-102479](https://nvd.nist.gov/vuln/detail/CVE-2026-102479) - [https://gitlab.eclipse.org/security/cve-assignment/-/work\_items/352](https://gitlab.eclipse.org/security/cve-assignment/-/work_items/352) - [https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-ch7p-g5pm-3gqx](https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-ch7p-g5pm-3gqx) [← All CVEs](https://panop.io/threat-heartbeat/) ## What this record can't tell you - Whether you run the affected software, and where - Whether an attacker can actually reach and exploit it - The misconfigurations that never get a CVE number - What it would cost the business, ranked into what to fix first Panop answers these inside your environment, for this CVE and every other finding. [Book a demo](https://panop.io/demo)