h2
PyPI2 known CVEs affecting this package
Aggregated from OSV, GitHub Security Advisories, NVD, and vendor advisories. Each CVE links to its full detail page with vendor advisories, patches, fixed versions, and remediation guidance.
CVEs affecting h2page 1 of 1
- CVE-2025-57804MEDIUMCVSS 6.9EG 6.9✓ Fixed in 4.3.02025-08-25
vulnerable: 0.1.0 ... 4.2.0 (45 versions)
h2 is a pure-Python implementation of a HTTP/2 protocol stack. Prior to version 4.3.0, an HTTP/2 request splitting vulnerability allows attackers to perform request smuggling attacks by injecting CRLF characters into headers. This occurs w…
- CVE-2026-71554MEDIUMCVSS 5.3EG 5.3✓ Fixed in 4.4.12026-08-06
vulnerable: 0.1.0 ... 4.4.0 (47 versions)
h2 is a pure-Python implementation of a HTTP/2 protocol stack. Versions up to and including 4.4.0 accept request header blocks containing more than one Host header, and forward every Host header to the consuming application. Where the cons…
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