CVE-2026-102477

What it is

In Eclipse Vert.x versions [4.0.0, 4.5.34] or [5.0.0,5.0.12] or [5.1.0,5.1.9] or [5.2.0, 5.2.0], a gRPC endpoint does have a configurable per message maximum size in bytes, however the maximum size applies to the received bytes. When applied to a compressed message, this only applies to the compressed size and not the actual size of the uncompressed content. This can be used to force a gRPC endpoint to allocate more bytes than the value defined by the configuration, making the endpoint vulnerable to compression bomb attacks. The impacted component is io.vertx:vertx-gprc-server.

At a glance

Exploitability

Can be exploited over the network without logging in. High risk of service disruption.

Exploit odds

0.3% chance of exploitation in the next 30 days (EPSS).

Fix

A patch, advisory or fixed version is referenced. Upgrade or apply it.

Timeline

1. 2026-09-29 08:41 UTC ReservedThe CVE id was reserved by its CNA
2. 2026-10-15 09:17 UTC PublishedDisclosed publicly on CVE.org and NVD
3. 2026-10-20 19:27 UTC Last updatedMost recent change to the record

Details

Published

2026-10-15 09:17 UTC

Last modified

2026-10-20 19:27 UTC

Exploit probability

0.3% · EPSS, next 30 days

Weakness

CWE-409

Record status

Analyzed

Affected

• Eclipse vert.x < 4.5.35
• Eclipse vert.x < 5.2.0
• Eclipse vert.x 5.2.0

Attack profile CVSS 4.0 · 8.7

Attack vector

Network

Complexity

Low

Attack requirements

None

Privileges needed

None

User interaction

None

Confidentiality

None

Integrity

None

Availability

High