CVE-2025-67640 is a vulnerability identified in the Jenkins Git client Plugin version 6.4.0 and earlier. The root cause is improper escaping of the workspace directory path when it is used as part of an argument in a temporary shell script generated by the plugin. This improper sanitization allows an attacker who can control or influence the workspace directory name to inject arbitrary operating system commands. Since Jenkins is widely used for continuous integration and continuous deployment (CI/CD), this vulnerability can be exploited to execute malicious commands on the Jenkins server, potentially leading to full system compromise or lateral movement within the network. The vulnerability does not require authentication if the attacker can influence the workspace directory name, which might be feasible in multi-tenant or shared Jenkins environments or where untrusted users can trigger builds with crafted parameters. No CVSS score has been assigned yet, and no exploits have been observed in the wild as of the publication date. The vulnerability highlights the importance of proper input sanitization in plugins that generate shell scripts dynamically. The lack of patch links suggests that a fix may not yet be publicly available, so organizations should monitor Jenkins advisories closely. The attack vector involves injection via shell script arguments, which is a critical security flaw given the high privileges Jenkins often runs with. This vulnerability could be leveraged to execute arbitrary commands, steal credentials, or disrupt build pipelines.

For European organizations, the impact of CVE-2025-67640 can be significant. Jenkins is widely adopted across various industries including finance, manufacturing, telecommunications, and government sectors in Europe. Exploitation could lead to unauthorized code execution on build servers, resulting in compromised build artifacts, insertion of malicious code into software releases, and potential exposure of sensitive credentials or intellectual property. This could disrupt software development lifecycles, cause reputational damage, and lead to regulatory compliance issues under frameworks like GDPR if personal data is involved. Organizations with CI/CD pipelines exposed to external contributors or automated triggers are particularly at risk. The vulnerability could also be used as a foothold for further attacks within corporate networks. Given the critical role of Jenkins in software delivery, exploitation could impact availability and integrity of software products and services. The absence of known exploits currently provides a window for proactive mitigation, but the risk remains high due to the ease of command injection once the workspace directory name is controlled.

To mitigate CVE-2025-67640, European organizations should: 1) Immediately audit Jenkins instances to identify usage of the Git client Plugin version 6.4.0 or earlier. 2) Restrict permissions so that only trusted users can configure or influence workspace directory names, preventing untrusted input from reaching the vulnerable code path. 3) Monitor Jenkins build logs and workspace directory names for suspicious or unexpected characters that could indicate attempted exploitation. 4) Apply any available patches or updates from the Jenkins project as soon as they are released. 5) Consider isolating Jenkins build environments and limiting network access to reduce potential impact of compromise. 6) Employ runtime security controls such as endpoint detection and response (EDR) to detect anomalous command execution on Jenkins servers. 7) Review and harden CI/CD pipeline configurations to minimize exposure to untrusted inputs. 8) Engage in regular security assessments and penetration testing focused on CI/CD infrastructure. These steps go beyond generic advice by focusing on controlling workspace directory naming and monitoring for injection attempts specific to this vulnerability.