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GO-2026-6139

Server-side request forgery in bidder adapters in github.com/prebid/prebid-server/v4

Quick fix

GO-2026-6139 — github.com/prebid/prebid-server/v4: upgrade to the fixed version with the command below.

go get github.com/prebid/prebid-server/v4@v4.4.0

Details

In github.com/prebid/prebid-server/v4 before 4.4.0, multiple bidder adapters (acuityads, bidmachine, relevantdigital, smartyads, tappx, trafficgate, zeroclickfraud) interpolate user-supplied host and subdomain parameters into outbound request URLs without validation. A remote attacker can craft bid request parameters containing path traversals or target addresses to trigger server-side request forgery (SSRF), sending HTTP requests to internal network services or unintended endpoints.

Are you affected?

Enter the version of the package you're using.

Affected packages

Go/github.com/prebid/prebid-server/v4
Introduced in: 0Fixed in: 4.4.0
Fixgo get github.com/prebid/prebid-server/v4@v4.4.0

References