View at Official ubuntu advisory, NVD, CVE.org · CVE detail
Freshness: upstream tracker timestamp is available; use API updated time as primary recency signal.
CVE-2003-1564 low priority: Ubuntu including 1 source packages (libxml2), 6 status rows across 6 suites (hardy, lucid, natty, oneiric, precise, upstream): not-affected 5, released 1.
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."