Vulnerabilities in pkg:golang/github.com/prebid/prebid-server/v3

PACKAGE
Advisory Identifier: GHSA-4p3g-4hcj-wpvx
Share
Advisory Summary

CVE-2026-54735 is a CRITICAL (CVSS 10.0) prebid-server's request forgery vulnerability allows vulnerability (CWE-918: Server-Side Request Forgery (SSRF)) affecting Github.com/prebid/prebid server/v4 libraries in the Go ecosystem. The issue involves prebid-server's request forgery vulnerability allows for possible host environment data extraction. Remediation is available by upgrading affected packages to version 4.4.0.

1 Known Advisory Record(s)
Package Vulnerability Intelligence

pkg:golang/github.com/prebid/prebid-server/v3

1 Known Advisory Record(s)

Vulnerability advisories affecting package pkg:golang/github.com/prebid/prebid-server/v3. Select an advisory below to view technical details or fixes.

Advisory ID CVE / NVD Severity Summary
GHSA-4p3g-4hcj-wpvx CVE-2026-54735 CRITICAL prebid-server's request forgery vulnerability allows for possible host environment data extraction

CVE-2026-54735 at a Glance

CVE Identifier CVE-2026-54735
GHSA Identifier GHSA-4p3g-4hcj-wpvx
Severity CRITICAL
CVSS v3.1 Base Score 10.0
CWE Classification CWE-918: Server-Side Request Forgery (SSRF)
Affected Product Github.com/prebid/prebid server/v4
Package Ecosystem Go
Published Date
Last Updated

Security Impact

CVSS: 10.0

The security impact metrics below are parsed directly from the CVSS v3.1 vector string (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H).

Attack Vector Network (AV:N)
Attack Complexity Low (AC:L)
Privileges Required None (PR:N)
User Interaction None (UI:N)
Scope Changed (S:C)
Confidentiality High (C:H)
Integrity High (I:H)
Availability High (A:H)

How to Fix CVE-2026-54735

To remediate this vulnerability, upgrade all affected Github.com/prebid/prebid server/v4 dependencies to a patched release. Both direct and transitive dependencies should be checked, as frameworks or security libraries may pull in vulnerable versions transitively.

github.com/prebid/prebid-server/v4 fixed: 4.4.0 
Upgrade github.com/prebid/prebid-server/v4 to 4.4.0
github.com/prebid/prebid-server/v3 fixed: Latest secure release 
Upgrade github.com/prebid/prebid-server/v3 to Latest secure release
github.com/prebid/prebid-server/v2 fixed: Latest secure release 
Upgrade github.com/prebid/prebid-server/v2 to Latest secure release
github.com/prebid/prebid-server fixed: Latest secure release 
Upgrade github.com/prebid/prebid-server to Latest secure release
Verify Direct and Transitive Dependencies

Run the following command in your project directory to verify that all resolved dependencies use the patched release: 

inspect dependencies for github.com/prebid/prebid-server/v4

How to Check if You Are Affected

To determine whether your application is affected by CVE-2026-54735, inspect your project dependencies for Github.com/prebid/prebid server/v4:

inspect dependencies for github.com/prebid/prebid-server/v4

Analyze the terminal output to locate any version of Github.com/prebid/prebid server/v4 in your dependency tree. If any resolved version matches the vulnerable ranges listed in the table below (for example, versions earlier than 4.4.0), your application is affected.

Note: Verify declared build manifests and deployed runtime container environments.

Technical Details

Vulnerability Mechanism & Technical Analysis

This vulnerability is classified under CWE-918: Server-Side Request Forgery (SSRF), where the web server receives a url or similar request from an upstream component and retrieves the contents of this url, but it does not sufficiently ensure that the request is being sent to the expected destination. In Github.com/prebid/prebid server/v4, software state validation or input boundaries are circumvented during processing. Review the official source advisory statement below for specific affected components, classes, and reproduction details.

Source Advisory Statement

### Impact Certain bidder adapters accept user-supplied parameters that are interpolated into outbound request URLs. Without proper input validation, a malicious actor could craft bid request parameters that cause the server to send HTTP requests to unintended destinations, potentially exposing internal network services or sensitive server endpoints to unauthorized access. ### Patches Patched in [v4.4.0](https://github.com/prebid/prebid-server/releases/tag/v4.4.0) ### Workarounds If one is unable to update, please make sure that the affected bidder adapters are disabled.

CVE-2026-54735 Affected Github.com/prebid/prebid server/v4 Versions

4 component(s)
Fixed Versions:
4.4.0
Product / Package Ecosystem Affected Versions Fixed Version
github.com/prebid/prebid-server/v4
golang/github.com/prebid/prebid-server/v4
Go
< 4.4.0
4.4.0
github.com/prebid/prebid-server/v3
golang/github.com/prebid/prebid-server/v3
Go
≤ 3.30.0
github.com/prebid/prebid-server/v2
golang/github.com/prebid/prebid-server/v2
Go
≤ 2.32.0
github.com/prebid/prebid-server
golang/github.com/prebid/prebid-server
Go
≤ 0.275.0

References

GitHub Advisory / Wiki ADVISORY
https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx
Github.com/prebid/prebid server/v4 Source Repository REPOSITORY
https://github.com/prebid/prebid-server/pull/4802
Security Fix Commit FIX COMMIT
https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3
Github.com/prebid/prebid server/v4 Source Repository REPOSITORY
https://github.com/prebid/prebid-server
Github.com/prebid/prebid server/v4 Release RELEASE
https://github.com/prebid/prebid-server/releases/tag/v4.4.0

Frequently Asked Questions

What is CVE-2026-54735?
CVE-2026-54735 is a security vulnerability in Github.com/prebid/prebid server/v4 involving prebid-server's request forgery vulnerability allows for possible host environment data extraction under CWE-918: Server-Side Request Forgery (SSRF).
Which Github.com/prebid/prebid server/v4 versions are affected?
Affected versions include releases prior to 4.4.0 across affected packages: github.com/prebid/prebid-server/v4, github.com/prebid/prebid-server/v3, github.com/prebid/prebid-server/v2, github.com/prebid/prebid-server.
What version fixes CVE-2026-54735?
Upgrading to 4.4.0 (or the latest patched release for your respective branch) resolves the vulnerability.
Is github.com/prebid/prebid-server/v4 affected?
Yes, github.com/prebid/prebid-server/v4 is affected in releases prior to 4.4.0. Upgrade your dependency to 4.4.0 or later.
Is github.com/prebid/prebid-server/v3 affected?
Yes, github.com/prebid/prebid-server/v3 is affected in releases prior to Latest secure release. Upgrade your dependency to Latest secure release or later.
What is the CVSS score of CVE-2026-54735?
CVE-2026-54735 has a CVSS v3.1 base score of 10.0 (CRITICAL) with vector string CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H.
What CWE is associated with CVE-2026-54735?
CVE-2026-54735 is classified under CWE-918: Server-Side Request Forgery (SSRF) (The web server receives a URL or similar request from an upstream component and retrieves the contents of this URL, but it does not sufficiently ensure that the request is being sent to the expected destination.).
How can I check Go dependencies for CVE-2026-54735?
Run the dependency tree command: 'inspect dependencies for github.com/prebid/prebid-server/v4'. This command lists direct and transitive dependencies in your build configuration so you can verify if a vulnerable version is resolved.
Machine-readable OSV JSON OSV v1.5 Schema
Normalized schema output
View Raw JSON 
{
  "schema_version" : "1.4.0",
  "id" : "GHSA-4p3g-4hcj-wpvx",
  "modified" : "2026-07-29T16:00:36Z",
  "published" : "2026-07-29T16:00:36Z",
  "aliases" : [ "CVE-2026-54735" ],
  "summary" : "prebid-server's request forgery vulnerability allows for possible host environment data extraction",
  "details" : "### Impact\nCertain bidder adapters accept user-supplied parameters that are interpolated into outbound request URLs. Without proper input validation, a malicious actor could craft bid request parameters that cause the server to send HTTP requests to unintended destinations, potentially exposing internal network services or sensitive server endpoints to unauthorized access.\n\n### Patches\nPatched in [v4.4.0](https://github.com/prebid/prebid-server/releases/tag/v4.4.0)\n\n### Workarounds\nIf one is unable to update, please make sure that the affected bidder adapters are disabled.",
  "severity" : [ {
    "type" : "CVSS_V3",
    "score" : "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:C/C:H/I:H/A:H"
  } ],
  "affected" : [ {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/prebid/prebid-server/v4"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "fixed" : "4.4.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/prebid/prebid-server/v3"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "3.30.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/prebid/prebid-server/v2"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "2.32.0"
      } ]
    } ]
  }, {
    "package" : {
      "ecosystem" : "Go",
      "name" : "github.com/prebid/prebid-server"
    },
    "ranges" : [ {
      "type" : "ECOSYSTEM",
      "events" : [ {
        "introduced" : "0"
      }, {
        "last_affected" : "0.275.0"
      } ]
    } ]
  } ],
  "references" : [ {
    "type" : "WEB",
    "url" : "https://github.com/prebid/prebid-server/security/advisories/GHSA-4p3g-4hcj-wpvx"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/prebid/prebid-server/pull/4802"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/prebid/prebid-server/commit/494ac271cd4b5024df9123ef25ca3cff96390be3"
  }, {
    "type" : "PACKAGE",
    "url" : "https://github.com/prebid/prebid-server"
  }, {
    "type" : "WEB",
    "url" : "https://github.com/prebid/prebid-server/releases/tag/v4.4.0"
  } ],
  "database_specific" : {
    "cwe_ids" : [ "CWE-918" ],
    "severity" : "CRITICAL",
    "github_reviewed" : true,
    "github_reviewed_at" : "2026-07-29T16:00:36Z",
    "nvd_published_at" : null
  }
}