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-2011-5129 medium priority: Ubuntu including 2 source packages (xchat, xchat-gnome), 12 status rows across 6 suites (hardy, lucid, natty, oneiric, precise, upstream): not-affected 9, needs-triage 2, ignored 1.
Heap-based buffer overflow in XChat 2.8.9 and earlier allows remote attackers to cause a denial of service (crash) and possibly execute arbitrary code via a long response string.