{"action":"Upgrade h2 to 4.4.1 or later.","affected":[{"fixed":"4.4.1","introduced":"0"}],"component":"h2","cve_ids":["CVE-2026-71554"],"ecosystem":"PyPI","epss":0.00418,"exploited":false,"fixed_versions":["4.4.1"],"ghsa_id":"GHSA-6hr6-w5qg-qmwg","id":"tcs_01M5KF3HKMVKEAE67AEH9B123W","modified_at":"2026-09-10T03:51:13.136510577Z","published_at":"2026-08-06T21:53:41Z","references":["https://osv.dev/vulnerability/GHSA-6hr6-w5qg-qmwg","https://github.com/python-hyper/h2/security/advisories/GHSA-6hr6-w5qg-qmwg","https://github.com/python-hyper/h2/commit/292a40829feefda98c8509dcdbbb4a57af9bd6a6","https://github.com/python-hyper/h2"],"severity":{"label":"medium","score":5.3},"sources":[{"source":"osv","source_id":"GHSA-6hr6-w5qg-qmwg","url":"https://osv.dev/vulnerability/GHSA-6hr6-w5qg-qmwg"}],"summary":"h2: Duplicate Host header could facilitate request smuggling"}