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."
References (6)
Scores
CVSS v3
6.5
EPSS
0.0059
EPSS Percentile
69.3%
Attack Vector
NETWORK
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:N/I:N/A:H
Details
CWE
CWE-776
Status
published
Products (1)
xmlsoft/libxml2
< 2.5.0
Published
Dec 31, 2003
Tracked Since
Feb 18, 2026