CVE-2026-16124 in GoClaw
Summary
by MITRE • 07/18/2026
A security vulnerability has been detected in nextlevelbuilder GoClaw up to 3.15.0-beta.32. This affects the function CheckSSRF/isPrivateIP of the file internal/tools/web_shared.go of the component web_fetch. Such manipulation leads to server-side request forgery. The attack can be launched remotely. The exploit has been disclosed publicly and may be used. Upgrading to version 3.15.0-beta.33 is able to mitigate this issue. The name of the patch is 12a0168271827650ddb0026d6277fbadf3dcf3ea. Upgrading the affected component is recommended.
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Analysis
by VulDB Data Team • 07/18/2026
This security vulnerability in nextlevelbuilder GoClaw affects version 3.15.0-beta.32 and earlier, specifically within the web_fetch component's CheckSSRF/isPrivateIP function located in internal/tools/web_shared.go. The flaw represents a server-side request forgery vulnerability that allows remote attackers to manipulate the application's behavior by making unauthorized requests to internal systems. This type of vulnerability falls under CWE-918, which categorizes server-side request forgery as a critical security weakness where applications fail to properly validate and sanitize external input before using it in HTTP requests.
The technical implementation of this vulnerability stems from inadequate validation of IP address ranges within the isPrivateIP function, which fails to properly distinguish between public and private network addresses. When the CheckSSRF function processes incoming requests, it does not sufficiently verify that the target URLs or IP addresses are legitimate external resources, enabling attackers to bypass security controls and potentially access internal services that should remain protected from external access. This weakness creates an attack surface where malicious actors can leverage the application's own network capabilities against internal systems.
The operational impact of this vulnerability is significant as it enables remote exploitation without requiring authentication or privileged access. Attackers can craft specially formatted requests that cause the vulnerable application to make unintended HTTP requests to internal services, potentially leading to data exfiltration, internal network reconnaissance, or further compromise of systems within the internal network. The vulnerability's disclosure and public availability of exploits means that threat actors can readily leverage this weakness without requiring advanced technical skills or specific knowledge about the target environment.
Mitigation efforts should focus on upgrading to version 3.15.0-beta.33 which includes the patch identified by commit hash 12a0168271827650ddb0026d6277fbadf3dcf3ea. This upgrade addresses the core validation issue in the isPrivateIP function by implementing more robust IP address range checking and ensuring that the SSRF protection mechanism properly distinguishes between external and internal network resources. Organizations should also implement additional defensive measures such as network segmentation, firewall rules to restrict outbound connections from the application server, and monitoring for unusual outbound requests that may indicate exploitation attempts. The vulnerability's classification aligns with ATT&CK technique T1190 which covers exploiting vulnerabilities in web applications to gain unauthorized access to internal systems, making this an urgent concern for organizations that rely on the affected software components.
The remediation process should include comprehensive testing of the patched version to ensure that legitimate functionality remains intact while the SSRF vulnerability is properly addressed. Security teams should also conduct thorough assessments of their network architecture to identify potential attack vectors and implement additional controls such as web application firewalls and outbound traffic filtering mechanisms to provide defense in depth against similar vulnerabilities.