CVE-2026-102476: Vulnerability in Eclipse Foundation Eclipse Vert.x
Description
CVE-2026-102476 is a critical vulnerability in Eclipse Vert.x HTTP client versions 5.0.0 through 5.0.12, 5.1.0 through 5.1.9, and 5.2.0. The issue arises because the SSL context cache key does not fully represent the SSL properties, allowing a client to receive an SSL context with weaker security properties than requested, such as bypassing hostname validation.
CVSS v4.0
Score 9.1critical
Affected software
Eclipse Foundation
Eclipse Vert.x
pkg:maven/io.vertx/vertx-coreRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
In Eclipse Vert.x versions 5.0.0 to 5.0.12, 5.1.0 to 5.1.9, and 5.2.0, the HTTP client component uses an SSL context cache keyed for efficiency. However, the cache key does not fully capture the SSL semantics, which can cause a client requesting an SSL context with strict properties (e.g., hostname validation) to receive one with weaker properties (e.g., no hostname validation). This undermines the security guarantees of SSL/TLS connections.
Potential Impact
This vulnerability can lead to clients accepting SSL contexts that do not enforce hostname validation, potentially enabling man-in-the-middle attacks or other SSL/TLS security bypasses. The CVSS 4.0 score is 9.1 (critical), indicating a high-impact security flaw with network attack vector, high complexity, and no privileges or user interaction required.
Mitigation Recommendations
Patch status is not yet confirmed — check the vendor advisory for current remediation guidance. No official fix or patch links are provided in the available data. Users should monitor Eclipse Foundation advisories for updates and apply patches once available.
Technical Details
- Data Version
- 5.2
- Assigner Short Name
- eclipse
- Date Reserved
- 2026-09-29T08:41:00.650Z
- Cvss Version
- 4.0
- State
- PUBLISHED
Threat ID: 6acfc7fd2cdf04f6569f5eba
Added to database: 10/14/2026, 18:20:45 UTC
Last enriched: 10/14/2026, 18:33:59 UTC
Last updated: 10/14/2026, 19:00:29 UTC
Views: 14
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