CVE-2026-25765 is a medium-severity vulnerability affecting the Faraday HTTP client library. This vulnerability allows attackers to exploit the library's handling of user-supplied input, specifically through the build_exclusive_url method. Versions of Faraday prior to 2.14.1 are susceptible to this issue, which has been classified under the CWE-918 (Server-Side Request Forgery).
The vulnerability stems from the use of Ruby's URI#merge method in Faraday to combine the base URL with user-defined paths. According to RFC 3986, protocol-relative URLs can override the host component of the base URL. This means that if applications pass user-controlled input to Faraday's request methods, an attacker can redirect these requests to an arbitrary host using a crafted URL.
As a result, the potential impact includes unauthorized access to sensitive information from other services, making it critical for users of the affected versions to address this vulnerability swiftly. Organizations should prioritize patching to version 2.14.1, which contains the necessary fix.
The vulnerability was published on February 9, 2026, and it is essential for organizations to assess their usage of the Faraday library and apply the latest updates as soon as possible.
Vulnerability Details
According to the official CVE description, Faraday's build_exclusive_url method allows attackers to leverage protocol-relative URLs to redirect requests, enabling SSRF. The CVSS score assigned to this vulnerability is 5.8, indicating a medium severity level, which derives from its low attack complexity and lack of required privileges or user interaction.
The vulnerabilities affect all versions of Faraday prior to 2.14.1, and the vulnerability was disclosed on February 9, 2026. Organizations using Faraday should be aware that the effective patch is available in version 2.14.1.
Technical Analysis
The root cause of CVE-2026-25765 is the improper handling of user-supplied input within Faraday's request methods. By using Ruby's URI#merge, the library allows for the construction of URLs that can inadvertently redirect requests to unauthorized hosts. The attack vector is network-based, and the attack complexity is classified as low, meaning that an attacker can exploit this vulnerability without significant effort.
No privileges are required to exploit this vulnerability, and user interaction is not necessary. The confidentiality impact is low, as sensitive data may be exposed to the attacker. However, there is no impact on integrity or availability.
Risk & Impact Analysis
The potential risk to organizations includes unauthorized access to internal services and sensitive data exposure. Given the nature of SSRF vulnerabilities, the blast radius could extend to any service that can be accessed from the vulnerable application, potentially leading to significant security breaches.
Organizations should assess their exposure to this vulnerability based on the CVSS score of 5.8, indicating a need for prompt remediation. Given that this vulnerability is not present in the KEV catalog, immediate action is still advised due to the nature of the exploit.
Signal | Status |
|---|---|
Known Exploit | No |
Public PoC | No |
Actively Exploited | No |
Ransomware Use | No |
Affected Versions
The vulnerability affects all versions of Faraday prior to 2.14.1. This includes versions ranging from 1.0.0 to 1.10.5 and 2.0.0 to 2.14.0. Organizations using these versions should prioritize their upgrade to 2.14.1 to mitigate the risk associated with this vulnerability.
Mitigation & Remediation
Organizations should upgrade to Faraday version 2.14.1 or later to resolve this vulnerability. If a patch is not immediately available, consider implementing network controls to limit outgoing requests to known and trusted hosts. Monitoring should be enhanced to detect any unusual request patterns that may indicate exploitation attempts.
For additional guidance on secure coding practices and vulnerability management, organizations may refer to resources on application security and penetration testing.
Detection Guidance
Organizations should monitor logs for indicators of SSRF attempts, such as unusual outbound requests to unrecognized domains. Behavioral anomalies in network traffic can also signal exploitation attempts. Implementing strict access controls on outbound requests can help mitigate the risk associated with this vulnerability.
AppSecure Threat Intelligence Insight
CVE-2026-25765 highlights the critical importance of validating user input in web applications. As organizations increasingly rely on third-party libraries, understanding the security implications of such dependencies is essential. This vulnerability serves as a reminder to review the use of external libraries and ensure that they are kept up-to-date.
Security teams should implement a robust penetration testing methodology to identify weaknesses in their applications and dependencies.
Furthermore, integrating security into the development lifecycle through practices such as application security programs can help mitigate risks associated with vulnerabilities like CVE-2026-25765.
Finally, ongoing training and awareness for development teams about the risks of SSRF and best practices for secure coding are essential for long-term security.
Disclaimer: This content was generated using AI. While we strive for accuracy, please verify critical information with official sources.
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