CVE-2026-7736: GO-2026-5427 - GoBGP has an Integer Underflow Issue in github.com/osrg/gobgp

CVE-2026-7736 · Severity: high · CVSS 7.3 · Published 2026-05-04

A vulnerability was determined in osrg GoBGP up to 4.3.0. Affected by this vulnerability is the function parseRibEntry of the file pkg/packet/mrt/mrt.go. Executing a manipulation can lead to integer underflow. It is possible to launch the attack remotely. Upgrading to version 4.4.0 addresses this issue. This patch is called 76d911046344a3923cbe573364197aa081944592. It is suggested to upgrade the affected component.

Technologies: github.com/osrg/gobgp/v4 (Go), Osrg Gobgp. Vendors: Go, Osrg.

Quick answers

Is CVE-2026-7736 exploited in the wild?
No. Junglewise Threat Intelligence has no report of CVE-2026-7736 being exploited in the wild.
How severe is CVE-2026-7736?
High severity, with a CVSS score of 7.3, published 4 May 2026.
Which products and versions are affected?
github.com/osrg/gobgp/v4 (Go) SEMVER:introduced=0,fixed=4.4.0.
Is there a fix for CVE-2026-7736?
Yes. github.com/osrg/gobgp/v4 (Go): upgrade to 4.4.0 or later. Junglewise finds every place you run it, drafts the upgrade and applies it once you approve.
Am I affected by CVE-2026-7736?
Check whether you run github.com/osrg/gobgp/v4 (Go) or Osrg Gobgp at an affected version. Junglewise does that check for you around the clock: connect your code, cloud and domains, and it matches new vulnerabilities like this one against what you actually run and tells you when one reaches you.

How to fix

  • github.com/osrg/gobgp/v4 (Go): upgrade to 4.4.0 or later
    go get github.com/osrg/gobgp/v4@v4.4.0

Affected products

  • github.com/osrg/gobgp/v4 (Go) SEMVER:introduced=0,fixed=4.4.0
  • Osrg Gobgp

Identifiers

  • CVE-2026-7736
  • GHSA-hj4w-qr9j-c4cf
  • GO-2026-5427

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