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-2012-5371 low priority: Ubuntu including 2 source packages (ruby1.8, ruby1.9.1), 16 status rows across 8 suites (hardy, lucid, oneiric, precise, quantal, raring, saucy, upstream): not-affected 7, released 5, ignored 3, DNE 1.
Ruby (aka CRuby) 1.9 before 1.9.3-p327 and 2.0 before r37575 computes hash values without properly restricting the ability to trigger hash collisions predictably, which allows context-dependent attackers to cause a denial of service (CPU consumption) via crafted input to an application that maintains a hash table, as demonstrated by a universal multicollision attack against a variant of the MurmurHash2 algorithm, a different vulnerability than CVE-2011-4815.