PYSEC-2026-4053 hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

Impact Users of the python-hyper/hpack library, most commonly used as downstream dependency of the python-hyper/h2 library an HTTP/2 client and server implementation. Unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively blockin...

hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

ImpactUsers of the python-hyper/hpack library, most commonly used as downstream dependency of the python-hyper/h2 library an HTTP/2 client and server implementation. Unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively blocking...

PT-2026-105809

Impact Users of the python-hyper/hpack library, most commonly used as downstream dependency of the python-hyper/h2 library an HTTP/2 client and server implementation. Unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively blockin...

Linux Distros Unpatched Vulnerability : CVE-2026-59980

The Linux/Unix host has one or more packages installed that are impacted by a vulnerability without a vendor supplied patch available. - 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...

GHSA-8V8H-HG4W-MVQ2 hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

Impact Users of the python-hyper/hpack library, most commonly used as downstream dependency of the python-hyper/h2 library an HTTP/2 client and server implementation. Unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively blockin...

hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

Impact Users of the python-hyper/hpack library, most commonly used as downstream dependency of the python-hyper/h2 library an HTTP/2 client and server implementation. Unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively blockin...

DEBIAN-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 hpack: Unbounded variable integer decoding can cause run-away computation on malformed input

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...

PT-2026-89705

An issue was found in the python-hyper/hpack library, most commonly used as a downstream dependency of the python-hyper/h2 library an HTTP/2 client and server implementation. Unbounded variable integer decoding can cause run-away computation on malformed input leading to On^2 runtime, effectively...