CVE-2026-59980

hpack is an HTTP/2 Header Encoding for Python. Prior to version 4.2.0, unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively blocking further processing with large enough unsanitized input. A fix is available in python-hyper/hpa...

CVE-2026-59980

A flaw was found in hpack, an HTTP/2 Header Encoding for Python. Unbounded variable integer decoding can lead to excessive computation when processing specially crafted, malformed input. A remote attacker could exploit this vulnerability to cause a denial of service by effectively blocking furthe...