Answer in brief
CVE-2025-12748 records a Medium severity (CVSS 5.5) vulnerability in Libvirt: denial of service in xml parsing. The current sources do not mark it as known exploited. The current feed maps libvirt (generic), Red Hat/virt:rhel/libvirt (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 5.5. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps libvirt (generic), Red Hat/virt:rhel/libvirt (generic). Check affected ranges and fixed versions before updating.
| Package | Affected range | Fixed version |
|---|---|---|
| libvirtgeneric | >=0 <=11.9.0 | Not reported |
| Red Hat/virt:rhel/libvirtgeneric | * | Not reported |
Published upstream
Nov 11, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 18, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Jun 25, 2026
A flaw was discovered in libvirt in the XML file processing. More specifically, the parsing of user provided XML files was performed before the ACL checks. A malicious user with limited permissions could exploit this flaw by submitting a specially crafted XML file, causing libvirt to allocate too much memory on the host. The excessive memory consumption could lead to a libvirt process crash on the host, resulting in a denial-of-service condition.
Quoted source text, attributed separately from HOL analysis.