CVE-2003-1564 — MEDIUM severity vulnerability (libxml2, possibly before 2.5.0, does not properly detect rec)
libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the "billion laughs attack."
| CVE ID | CVE-2003-1564 |
|---|---|
| Severity | MEDIUM |
| CVSS score | 6.5 |
| CVSS vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H |
| CWE | CWE-776 |
| Status | Modified |
| Published | 2003-12-31 |
| Last modified | 2026-04-16 |
| Description | libxml2, possibly before 2.5.0, does not properly detect recursion during entity expansion, which allows context-dependent attackers to cause a denial of service (memory and CPU consumption) via a crafted XML document containing a large number of nested entity references, aka the "billion laughs attack." |
| Source | NIST National Vulnerability Database |
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