CVE-2026-82289 in Gitingest
Summary
by MITRE • 08/28/2026
Gitingest through 0.3.1 fails to properly validate hostnames in _validate_host, accepting any host with a git., gitlab., or github. prefix regardless of known-hosts list membership. Attackers can submit URLs with attacker-controlled hostnames to trigger outbound connections to arbitrary hosts and disclose GitHub personal access tokens via HTTP basic credentials.
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Analysis
by VulDB Data Team • 08/28/2026
The vulnerability in Gitingest versions through 0.3.1 represents a critical flaw in hostname validation logic, specifically within the _validate_host function. This component is responsible for ensuring that URLs processed by the application point to legitimate and expected repository hosting services rather than arbitrary external domains. The core technical failure lies in an overly permissive regular expression or string matching mechanism that accepts any hostname beginning with git., gitlab., or github. without performing a secondary verification against a known-good hosts list or validating the domain structure rigorously enough to prevent subdomain spoofing attacks. This design oversight allows attackers to construct malicious URLs where the host portion appears legitimate at first glance but actually resolves to an attacker-controlled server, thereby bypassing security controls intended to restrict outbound network connections to trusted entities only.
From a technical perspective, this flaw enables Server-Side Request Forgery (SSRF) scenarios where the application acts as a proxy for HTTP requests initiated by users. When a user submits a URL with a crafted hostname such as git.attacker.com or github.evil.org, the validation logic incorrectly deems it safe because it matches the prefix criteria. Consequently, Gitingest proceeds to fetch content from this malicious host. This behavior is particularly dangerous in environments where the application runs with elevated privileges or has access to sensitive internal resources and credentials stored on the local filesystem or environment variables. The lack of strict domain validation transforms a simple repository fetching tool into an instrument for data exfiltration, as the server will willingly transmit requests containing any attached authentication headers to destinations chosen by the attacker.
The operational impact of this vulnerability is severe, primarily centered around the disclosure of sensitive credentials such as GitHub Personal Access Tokens (PATs). Many users configure their development environments or CI/CD pipelines with these tokens stored in environment variables or configuration files that are accessible during the request processing phase. When Gitingest makes an outbound connection to a malicious host controlled by an attacker, it may inadvertently include HTTP Basic Authentication headers if such credentials are configured globally for git operations. The attacker can then capture these headers on their server, effectively stealing valid authentication tokens. These stolen tokens grant unauthorized access to private repositories, allowing the attacker to read source code, inject malware into projects, or further compromise downstream systems that rely on those same credentials, leading to a broader supply chain attack vector.
This vulnerability aligns with CWE-20 Improper Input Validation and CWE-918 Server-Side Request Forgery (SSRF). The failure to restrict outbound connections to a whitelist of known hosts is also characteristic of weaknesses found in ATT&CK technique T1571, which involves non-standard ports or protocols for command and control channels. By exploiting this flaw, an attacker can establish covert communication channels using the victim's infrastructure as a relay point, potentially bypassing network perimeter defenses that do not inspect outbound traffic from application servers closely enough to detect malicious payloads hidden within legitimate-looking git requests.
Mitigation strategies must focus on implementing strict allow-listing for hostnames rather than relying solely on prefix matching. Developers should update Gitingest to the latest patched version if available, as this issue has been addressed in subsequent releases by refining the validation logic to check against a definitive list of trusted domains and subdomains. In the interim, organizations running vulnerable instances should restrict outbound network traffic from the application server using firewall rules or egress filtering policies that only permit connections to known git hosting providers on standard ports. Additionally, auditing environment variables for stored credentials is essential; sensitive tokens like GitHub PATs should never be exposed in contexts where they might be transmitted over untrusted networks via HTTP basic authentication headers during automated fetch operations.