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CVE-2026-71554 h2: Duplicate Host header could facilitate request smuggling

🗓️ 06 Aug 2026 21:46:43Reported by GitHub_MType 
cvelist
 cvelist
🔗 www.cve.org👁 12 Views

CVE-2026-71554: Duplicate Host headers in h2 allow request smuggling when downgrading to HTTP/1.1.

Related
Affected
Refs
ReporterTitlePublishedViews
Family
attackerkb
ATTACKERKB
CVE-2026-71554
6 Aug 202621:46
attackerkb
circl
Circl
CVE-2026-71554
6 Aug 202623:32
circl
cve
CVE
CVE-2026-71554
6 Aug 202621:46
cve
euvd
EUVD
EUVD-2026-54177
6 Aug 202621:46
euvd
github
Github Security Blog
h2: Duplicate Host header could facilitate request smuggling
6 Aug 202621:53
github
nvd
NVD
CVE-2026-71554
6 Aug 202622:18
nvd
osv
OSV
GHSA-6HR6-W5QG-QMWG h2: Duplicate Host header could facilitate request smuggling
6 Aug 202621:53
osv
[
  {
    "vendor": "python-hyper",
    "product": "h2",
    "versions": [
      {
        "version": "< 4.4.1",
        "status": "affected"
      }
    ]
  }
]

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