CVE-2026-58507 in Gitea
Summary
by MITRE • 08/13/2026
Private Repository Existence Disclosure via go-get Meta Endpoint
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Analysis
by VulDB Data Team • 08/13/2026
The vulnerability described involves the disclosure of private repository existence through the go-get meta endpoint functionality within Go module systems. This issue arises when developers configure their Go environments to fetch modules from remote repositories, and the system inadvertently reveals whether specific private repositories are accessible or exist. The technical flaw stems from improper access control mechanisms in how the go-get protocol handles requests for module information, particularly when dealing with private repositories that require authentication.
The operational impact of this vulnerability extends beyond simple information disclosure, as it can enable attackers to map out the complete landscape of private code repositories within an organization's infrastructure. This reconnaissance capability allows threat actors to identify sensitive projects, understand organizational architecture, and prioritize subsequent attack vectors targeting specific modules or services. The vulnerability directly relates to CWE-200 which addresses improper information exposure, and aligns with ATT&CK technique T1593 for reconnaissance through information gathering. When combined with other reconnaissance activities, this disclosure can lead to more sophisticated attacks targeting vulnerable dependencies or exposed development environments.
Security professionals should implement strict access controls and authentication mechanisms for all Go module endpoints, particularly those handling private repositories. Organizations must ensure that their module servers properly validate access permissions before responding to go-get requests and should configure appropriate firewall rules to restrict access to sensitive module information. The implementation of proper authorization checks at the network level and application level can prevent unauthorized disclosure of repository existence. Additionally, security teams should regularly audit their Go module configurations and implement monitoring solutions that detect unusual patterns in module request behaviors. This vulnerability demonstrates how seemingly innocuous protocols can create significant security risks when not properly secured, emphasizing the importance of comprehensive access control reviews and adherence to secure coding practices for all network-facing components.
The technical implementation of this vulnerability typically occurs when developers configure their GOPROXY or GONOPROXY settings without proper authentication enforcement. The go-get protocol operates by making HTTP requests to determine module metadata, and if these requests do not properly validate user permissions or authentication status, they can return information about private repositories that would normally be inaccessible. This behavior creates a side-channel attack surface where attackers can enumerate repository existence through simple HTTP HEAD or GET requests against module endpoints, effectively bypassing normal access controls. The vulnerability particularly affects organizations using Git-based hosting services that support Go modules, including GitHub Enterprise, GitLab, and self-hosted solutions that have not properly configured their authentication mechanisms. Proper mitigation requires ensuring that all module endpoints return consistent responses regardless of repository access status, implementing robust authentication checks, and configuring proper network segmentation to limit exposure of sensitive module infrastructure.
Organizations should consider implementing comprehensive security testing procedures that specifically target Go module protocols and their interaction with private repositories. This includes automated scanning for exposed go-get endpoints and validation of access control configurations. The vulnerability also highlights the need for regular security awareness training for development teams regarding the proper configuration of module repositories and the potential risks associated with insecure module handling. Implementation of secure-by-default configurations for Go module systems can prevent many instances of this vulnerability from occurring in production environments. Security controls should include network-level filtering to restrict access to go-get endpoints, proper logging and monitoring of module requests, and regular security assessments of all code repository infrastructure. The remediation process requires careful coordination between development teams and security operations to ensure that access controls are properly implemented without disrupting legitimate development workflows.
This vulnerability represents a specific instance of broader information disclosure risks in modern software development environments where automated tools and protocols interact with sensitive infrastructure components. The exposure of private repository existence can significantly impact an organization's security posture by providing attackers with valuable intelligence for targeting future operations. Security teams must recognize that vulnerabilities like this often serve as initial entry points for more sophisticated attacks, making prompt remediation critical to overall organizational defense. The interconnected nature of modern software development environments means that seemingly isolated protocol vulnerabilities can create cascading effects throughout an organization's infrastructure, emphasizing the importance of comprehensive security monitoring and incident response capabilities.