CVE-2026-7736: GoBGP Integer Underflow Threatens BGP Routing
The National Vulnerability Database (NVD) has detailed CVE-2026-7736, a high-severity integer underflow vulnerability affecting osrg GoBGP up to version 4.3.0. This flaw resides within the parseRibEntry function of the pkg/packet/mrt/mrt.go file, enabling a remote attacker to trigger the underflow through malicious manipulation.
The critical aspect here is the potential for remote exploitation. GoBGP is a widely used BGP implementation, making this vulnerability a significant concern for network operators and infrastructure security. An attacker could potentially disrupt BGP routing, leading to network instability, service outages, or even traffic misdirection if exploited successfully. The NVD assigns this a CVSS v3.1 score of 7.3 (High).
Defenders must prioritize patching. The NVD confirms that upgrading to GoBGP version 4.4.0 addresses this issue. The relevant patch is identified as 76d911046344a3923cbe573364197aa081944592. This isn’t theoretical; integer underflows in critical network components can have real-world impact, especially given the foundational role BGP plays in global internet routing.
What This Means For You
- If your organization uses osrg GoBGP, you need to immediately verify your version. Prioritize upgrading to version 4.4.0 or later to mitigate CVE-2026-7736. This is a remote exploit in a core routing component – don't delay.
Related ATT&CK Techniques
🛡️ Detection Rules
1 rule · 6 SIEM formats1 detection rule auto-generated for this incident, mapped to MITRE ATT&CK. Sigma YAML is free — export to any SIEM format via the Intel Bot.
CVE-2026-7736: GoBGP parseRibEntry Integer Underflow Attempt
title: CVE-2026-7736: GoBGP parseRibEntry Integer Underflow Attempt
id: scw-2026-05-04-ai-1
status: experimental
level: high
description: |
This rule detects attempts to exploit CVE-2026-7736 in GoBGP. The vulnerability lies in the parseRibEntry function, which can be triggered by manipulating BGP routing information, specifically when processing RIB entries. This detection looks for the gobgpd process being executed with command-line arguments that suggest manipulation of RIB entries, a potential indicator of an exploit attempt targeting this vulnerability.
author: SCW Feed Engine (AI-generated)
date: 2026-05-04
references:
- https://shimiscyberworld.com/posts/nvd-CVE-2026-7736/
tags:
- attack.initial_access
- attack.t1190
logsource:
category: process_creation
detection:
selection:
Image|contains:
- 'gobgpd'
CommandLine|contains:
- '--rib-entry'
condition: selection
falsepositives:
- Legitimate administrative activity
Source: Shimi's Cyber World · License & reuse
Indicators of Compromise
| ID | Type | Indicator |
|---|---|---|
| CVE-2026-7736 | Integer Underflow | osrg GoBGP up to 4.3.0 |
| CVE-2026-7736 | Integer Underflow | Function: parseRibEntry in pkg/packet/mrt/mrt.go |
| CVE-2026-7736 | Patch | Upgrade to osrg GoBGP version 4.4.0 (patch 76d911046344a3923cbe573364197aa081944592) |
Written by SCW Vulnerability Desk
Source & Attribution
| Source Platform | NVD |
| Channel | National Vulnerability Database |
| Published | May 04, 2026 at 10:16 UTC |
This content was AI-rewritten and enriched by Shimi's Cyber World based on the original source. All intellectual property rights remain with the original author.
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