AIKIDO-2026-735910
vertx-web-client is vulnerable to Cookie Injection
75
CVE Score
High
Cookie Injection
TL;DR
WebClientSession in vertx-web-client stores a Set-Cookie value without checking that the Domain attribute matches the host that sent it. A server the application contacts can plant a cookie for another domain, and a later request to that domain sends the cookie. The fix passes the response host into cookie storage and only returns a cookie when its domain matches the request host.
How do I fix this?
Upgrade the io.vertx:vertx-web-client library to the patch version.
Who does this affect?
You are affected if you are using a version that falls within the vulnerable range and the application uses WebClientSession against a server you do not trust.
Package
Versions
4.0.0 - 4.5.29
Fixed in 4.5.305.0.0 - 5.1.4
Fixed in 5.1.5Background info
vertx-web-client is vulnerable to Cookie Injection in versions 4.0.0 - 4.5.29 and 5.0.0 - 5.1.4.
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