CVE-2025-5916 is a vulnerability identified in the libarchive library, a widely used open-source library for reading and writing various archive formats. The issue is an integer overflow or wraparound triggered when libarchive processes a Web Archive (WARC) file that falsely claims to contain more than INT64_MAX - 4 content bytes. Since the size field exceeds the maximum value representable by a signed 64-bit integer, arithmetic operations on this value wrap around, causing incorrect memory allocation or buffer size calculations. This can lead to memory corruption, unpredictable program behavior, or denial-of-service (DoS) conditions in applications that rely on libarchive to handle WARC files. The vulnerability affects all libarchive versions prior to 3.8.0, including those bundled with Red Hat Enterprise Linux 10. Exploitation requires local access with limited privileges and user interaction, such as opening or processing a malicious WARC archive. The CVSS v3.1 base score is 3.9, reflecting low severity due to limited impact on confidentiality and integrity, and the requirement for local privileges and user interaction. No public exploits have been reported, and no patches or mitigation links were provided in the source data, but upgrading to libarchive 3.8.0 or later is the recommended remediation.

The primary impact of CVE-2025-5916 is the potential for denial-of-service or application crashes due to memory corruption when processing malicious WARC files. While the vulnerability does not directly compromise confidentiality or integrity, the resulting instability could disrupt services that rely on libarchive for archive handling, such as backup systems, forensic tools, or content management platforms. Organizations that process large volumes of archive files or use automated systems to ingest WARC files are at higher risk. The requirement for local privileges and user interaction limits remote exploitation, reducing the threat to internet-facing services. However, insider threats or compromised user accounts could leverage this vulnerability to cause service interruptions or application failures. The absence of known exploits in the wild suggests limited active exploitation currently, but the vulnerability should be addressed proactively to avoid future risks.

To mitigate CVE-2025-5916, organizations should upgrade libarchive to version 3.8.0 or later, where the integer overflow issue has been resolved. If immediate upgrading is not feasible, implement strict validation and filtering of WARC files before processing, ensuring that file size headers do not exceed safe limits. Employ application-level sandboxing or containerization to isolate archive processing components, limiting the impact of potential crashes or memory corruption. Monitor logs and application behavior for abnormal crashes or denial-of-service symptoms related to archive handling. Restrict local user permissions to minimize the risk of unprivileged users triggering the vulnerability. Additionally, educate users about the risks of opening untrusted archive files and enforce policies to avoid processing archives from unknown or unverified sources. Regularly review and apply security updates from vendors, especially for Red Hat Enterprise Linux 10 environments where libarchive is included.