AIKIDO-2026-717833
vertx-web-client is vulnerable to Information Disclosure
75
CVE Score
High
Information Disclosure
TL;DR
CachingWebClient in vertx-web-client stores a response in the cache shared by the whole client when the response is cacheable and does not carry private or no-store. Several WebClientSession users of that client then receive one user's response for the same URL, including authenticated content or a session cookie. The fix keeps responses specific to one user, responses to requests that carry Authorization, and responses that carry Set-Cookie out of the shared cache.
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 one CachingWebClient is shared across users.
Package
Versions
4.0.0 - 4.5.35
Fixed in 4.5.365.0.0 - 5.2.2
Fixed in 5.2.3Background info
vertx-web-client is vulnerable to Information Disclosure in versions 4.0.0 - 4.5.35 and 5.0.0 - 5.2.2.
Links
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