MEDIUMPyPI →
h2: Duplicate Host header could facilitate request smuggling
h2: Duplicate Host header could facilitate request smuggling
Affected packages
- h2— before 4.4.1
Exploit signal
- Known exploited (CISA KEV)
- No
- EPSS score
- —
- EPSS percentile
- —
EPSS is the probability a CVE is exploited in the wild; percentile is its rank among all CVEs.
Sources
- 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
- https://pypi.org/project/h2
- https://github.com/advisories/GHSA-6hr6-w5qg-qmwg
- https://nvd.nist.gov/vuln/detail/CVE-2026-71554
Structured record: https://osv.dev/vulnerability/PYSEC-2026-3628
Recommended response stack
Snyk — Scan your dependencies in CI and fix this vulnerability.→Socket — Detect malicious and compromised packages before they ship.→
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