
poc-h2-CVE-2026-71554
PoC for CVE-2026-71554 - h2 duplicate Host header request smuggling primitive (fixed in 4.4.1)
adversarial-attackapi-securityapi-security-testing+4
1

PoC for CVE-2026-71554 - h2 duplicate Host header request smuggling primitive (fixed in 4.4.1)

Proof-of-concept exploit for CVE-2026-21003 demonstrating JWT authentication bypass by omitting the kid header and using the 'none' algorithm to…