Is CVE-2026-102479 exploited in the wild?

No. Junglewise Threat Intelligence has no report of CVE-2026-102479 being exploited in the wild.

How severe is CVE-2026-102479?

Informational severity, published 14 October 2026.

Which products and versions are affected?

Eclipse Vert.X 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, 5.2.0.

Is there a fix for CVE-2026-102479?

Yes: fixed in 5.0.13, 5.1.10, 5.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.

How is CVE-2026-102479 attacked?

It is attacked over the network, in a software library.

Am I affected by CVE-2026-102479?

Check whether you run Eclipse Vert.X at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

CVE-2026-102479: Eclipse Vert.x HTTP/1.x decoder request smuggling via header canonicalization

CVE-2026-102479 · Severity: info · Published 2026-10-14

Eclipse Vert.x is a framework for building reactive network applications. The HTTP/1.x decoder incorrectly handles canonicalized headers, allowing an attacker to craft malicious headers (like "Content-Xength") that are misinterpreted as legitimate headers (like "Content-Length"). This can enable HTTP request smuggling attacks, where attackers bypass security controls or inject malicious requests into the application.

Technologies: Eclipse Vert.X. Vendors: Eclipse.

Quick answers

Is CVE-2026-102479 exploited in the wild?: No. Junglewise Threat Intelligence has no report of CVE-2026-102479 being exploited in the wild.
How severe is CVE-2026-102479?: Informational severity, published 14 October 2026.
Which products and versions are affected?: Eclipse Vert.X 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, 5.2.0.
Is there a fix for CVE-2026-102479?: Yes: fixed in 5.0.13, 5.1.10, 5.2.1. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
How is CVE-2026-102479 attacked?: It is attacked over the network, in a software library.
Am I affected by CVE-2026-102479?: Check whether you run Eclipse Vert.X at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

Fixed in: 5.0.13, 5.1.10, 5.2.1

Technical details

The Vert.x HTTP/1.x decoder uses header canonicalization that allows well-crafted headers to be misinterpreted as standard HTTP headers, enabling request smuggling attacks. The vulnerability affects vertx-core, requires only network access with no authentication or user interaction, and allows an attacker to manipulate request processing logic. A fix is available in patched versions.

Affected products

Eclipse Vert.x 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, 5.2.0

Timeline

2026-10-07: disclosed
2026-10-14: advisory

References

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