CVE-2026-102479 Other in Eclipse Vert.x
Attackers can exploit HTTP header canonicalization flaws in Eclipse Vert.x to perform request smuggling, bypassing security controls.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-102479?
CVE-2026-102479 is a high-severity vulnerability in Eclipse Vert.x, published on 14 Oct 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-444
Which versions are affected by CVE-2026-102479?
It affects 1 product.
Products include Eclipse Vert.x.
How do I fix CVE-2026-102479?
No fix has been published for CVE-2026-102479 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-102479 being exploited?
There is no known exploitation of CVE-2026-102479 in the wild and no public exploit code.
Other vulnerabilities in Eclipse Vert.x
- CVE-2019-17640 Path Traversal in Eclipse Vert
- CVE-2018-12542 Eclipse Vert.x does not properly neutralize '' (forward slashes) sequences that can resolve to an external location
- CVE-2018-12544 Moderate severity vulnerability that affects io.vertx:vertx-core
- CVE-2026-102469 Deserialization in Eclipse Vert.x
- CVE-2018-12540 High severity vulnerability that affects io.vertx:vertx-web
Sources
Also known as GHSA-ch7p-g5pm-3gqx.