CVE-2026-102467

Unbounded WebSocket Decompression Allows Zip Bomb Denial of Service

Published Oct 15, 2026 CVSS 4.0 · 8.7 High EPSS < 1% KEV · Not listed

Description

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], the WebSocket implementation does not define a maximum number of bytes allocation when decompressing frames or messages. This can be used to implement DDOS attacks with a zip bomb.

The impacted component is io.vertx:vertx-core.

Affected Products

Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).

Vendor Product Default status Versions

Eclipse Foundation

Eclipse Vert.x

unaffected

Version	Status	Constraints
`4.0.0`	affected	≤ 4.5.34
`5.0.0`	affected	≤ 5.0.12
`5.1.0`	affected	≤ 5.1.9
`5.2.0`	affected	—

Configuration 1 [-]

OR	cpe:2.3:a:eclipse:vert.x::::::::
	cpe:2.3:a:eclipse:vert.x::::::::
	cpe:2.3:a:eclipse:vert.x:5.2.0:::::::*

No data.

Vendor Product Versions

Eclipse

Vert.x

Version	Status	Scheme	Platform
`[4.0.0,4.5.34]`	affected	semver	—
`[5.0.0,5.0.12]`	affected	semver	—
`[5.1.0,5.1.9]`	affected	semver	—
`5.2.0`	affected	semver	—

Remediation

No solution or workaround provided in the CVE record

Tracking

Advisories

No advisories available

Metrics

Attack Vector Network

Attack Complexity Low

Privileges Required None

Attack Requirements None

User Interaction None

Vulnerable System Confidentiality Impact None

Vulnerable System Integrity Impact None

Vulnerable System Availability Impact High

Subsequent System Confidentiality Impact None

Subsequent System Integrity Impact None

Subsequent System Availability Impact None

Attack Vector Network

Attack Complexity High

Privileges Required None

Scope Unchanged

Confidentiality Impact None

Integrity Impact None

Availability Impact High

User Interaction None

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

Exploit prediction score: < 1% (0.258% probability within 30 days)

Exploitation none

Automatable yes

Technical Impact partial

References

Link	Providers
https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-h722-h6c2-6j3c
https://gitlab.eclipse.org/security/cve-assignment/-/work_items/341

History

Oct 20, 2026 7:45 PM Affected versions updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
CPEs		cpe:2.3:a:eclipse:vert.x:::::::: cpe:2.3:a:eclipse:vert.x:5.2.0:::::::*
Metrics		cvssV3_1 `{'score': 5.9, 'vector': 'CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H'}`

Oct 19, 2026 4:45 PM Title updated View changes

Type	Values Removed	Values Added
Title		Unbounded WebSocket Decompression Allows Zip Bomb Denial of Service

Oct 19, 2026 2:30 PM First appearance in the feed. Affected vendors updated View changes

Type	Values Removed	Values Added
First Time appeared		Eclipse Eclipse vert.x
Vendors & Products		Eclipse Eclipse vert.x

Oct 15, 2026 3:30 PM Weaknesses updated. Scoring metrics updated View changes

Type	Values Removed	Values Added
Weaknesses		CWE-770
Metrics		ssvc `{'options': {'Automatable': 'yes', 'Exploitation': 'none', 'Technical Impact': 'partial'}, 'version': '2.0.3'}`

Oct 15, 2026 1:30 PM Description updated. Added references. Scoring metrics updated View changes

Type	Values Removed	Values Added
Description		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], the WebSocket implementation does not define a maximum number of bytes allocation when decompressing frames or messages. This can be used to implement DDOS attacks with a zip bomb. The impacted component is io.vertx:vertx-core.
References		https://github.com/eclipse-vertx/vert.x/security/advisories/GHSA-h722-h6c2-6j3c https://gitlab.eclipse.org/security/cve-assignment/-/work_items/341
Metrics		cvssV4_0 `{'score': 8.7, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N'}`