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CVE-2025-12748 is a denial-of-service vulnerability in libvirt's processing of user-supplied XML files. According to the provided content, libvirt parses the XML input before performing ACL checks. Because this parsing occurs prior to authorization enforcement, a malicious user with limited permissions can submit a specially crafted XML document that causes excessive memory allocation on the host during parsing. This can exhaust memory available to the libvirt process and trigger a crash.
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1 valid exploit after Mallory filtered fakes, detection scripts, and README-only repos.
This repository provides a proof-of-concept (PoC) exploit for CVE-2025-12748, a denial-of-service vulnerability in libvirt's XML file processing. The exploit leverages the fact that XML content is processed before ACL checks, allowing a user with limited permissions to submit a specially crafted XML file (oom.xml) that causes excessive resource consumption in the libvirtd process. The repository contains three files: a detailed README.md (with English and Russian instructions), a malicious XML file (oom.xml) designed to trigger the vulnerability, and a benign XML file (test.xml) for comparison. The README provides step-by-step setup instructions, including specific libvirt and polkit configurations required to reproduce the issue. The exploit is not part of a framework and is a standalone PoC. The main attack vector is local, requiring the attacker to have access to submit XML files to libvirt (e.g., via virsh). Several fingerprintable file paths are referenced in the setup and payload. The exploit demonstrates a denial-of-service condition but does not provide remote code execution or privilege escalation.
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