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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@v4.4.0Details
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:
0 Fixed in: 4.4.0 Fix
go get github.com/prebid/prebid-server/v4@v4.4.0 References
- https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx [ADVISORY]
- https://github.com/prebid/prebid-server/pull/4802 [FIX]
- https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3 [FIX]
- https://github.com/prebid/prebid-server/releases/tag/v4.4.0 [WEB]