CVE-2018-12541

Excessive memory allocation

6.5 MediumFix available

In version from 3.0.0 to 3.5.3 of Eclipse Vert.x, the WebSocket HTTP upgrade implementation buffers the full http request before doing the handshake, holding the entire request body in memory. There should be a reasonnable limit (8192 bytes) above which the WebSocket gets an HTTP response with the 413 status code and the connection gets closed.

Attack profile

How easy it is to exploit

Attack vector: Network
Complexity: Low
Privileges needed: Low
User interaction: None

What an attacker can affect

Confidentiality: None
Integrity: None
Availability: High

Exploit likelihood

2.65%Up 1.5 points since Apr 14, 2021

What each source reports

NVD Score used 6.5

Record: CVE-2018-12541
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CVSS 2.0: 4.0 MediumAV:N/AC:L/Au:S/C:N/I:N/A:P
Weakness: CWE-789, CWE-119
Updated: 2026-11-02

CVE List No score

Record: CVE-2018-12541
Weakness: CWE-789
Updated: 2026-11-02

EUVDEUVD-2018-0495 No score

Record: EUVD-2018-0495
Updated: 2026-11-03

GitHub AdvisoriesGHSA-45xm-v8gq-7jqx 6.5

Excessive memory allocation

Record: GHSA-45xm-v8gq-7jqx
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-119, CWE-789
Updated: 2026-11-02

OSV 6.5

Record: CVE-2018-12541
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Updated: 2026-11-02

OSVGHSA-45xm-v8gq-7jqx 6.5

Excessive memory allocation

Record: GHSA-45xm-v8gq-7jqx
CVSS 3.1: 6.5 MediumCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness: CWE-119, CWE-789
Updated: 2026-11-02

Affected products

Affected packages

Affected packages
Package	Affected	Fixed
`io.vertx:vertx-core` Maven	3.0.0 up to 3.5.4	3.5.4
`io.vertx:vertx-core` Maven	3.0.0 up to 3.5.4, plus listed versions 3.0.0-dev_preview13.1.03.2.03.2.13.3.0 Show 18 moreShow less 3.3.0.CR13.3.0.CR23.3.13.3.23.3.33.4.03.4.0.Beta13.4.13.4.23.5.03.5.0.Beta13.5.13.5.23.5.2.CR13.5.2.CR23.5.2.CR33.5.33.5.3.CR1	3.5.4

History

History
Recorded	Changed	Sources
Nov 3, 2026	aliases, products	EUVD
Nov 2, 2026	first indexed	CVE List, GitHub Advisories, NVD, OSV

Dates are when Every CVE recorded each change. Upstream dates may differ.

In short

CVE-2018-12541 is a medium vulnerability (CVSS 6.5) in Eclipse Vert.x, published October 10, 2018. No source lists public exploit code. EPSS puts the chance of exploitation in the next 30 days at 2.65%, the 85th percentile. Fixed in io.vertx:vertx-core 3.5.4.

References

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