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-2015-8659 medium priority: Ubuntu including 1 source packages (nghttp2), 9 status rows across 9 suites (artful, precise, trusty, upstream, vivid, wily, xenial, yakkety, zesty): ignored 3, not-affected 3, DNE 2, released 1.
The idle stream handling in nghttp2 before 1.6.0 allows attackers to have unspecified impact via unknown vectors, aka a heap-use-after-free bug.