https://vulnerability.circl.lu/rss/recent/all/10 Most recent entries from all 2026-09-28T17:27:04.656939+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent entries. https://vulnerability.circl.lu/vuln/brew-bilix-cve-2026-59980 BREW-bilix-CVE-2026-59980 — hpack: Unbounded variable integer decoding can cause run-away computation on malformed input 2026-09-28T17:27:04.662616+00:00

Affected: Homebrew: bilix

### 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 O(n^2) runtime, effectively blocking further processing with large enough unsanitized input.

### Patches A fix is available in python-hyper/hpack v4.2.0 to restricted variable integer decoding to uint32 to prevent run-away computation.

### Workarounds Sanitize input to hpack decoder for long sequences of `0xFF` values to prevent malicious use.

 https://vulnerability.circl.lu/vuln/fkie_cve-2026-59980 fkie_cve-2026-59980 2026-09-28T17:27:04.662834+00:00

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 O(n^2) runtime, effectively blocking further processing with large enough unsanitized input. A fix is available in python-hyper/hpack v4.2.0 to restricted variable integer decoding to uint32 to prevent run-away computation. As a workaround, sanitize input to hpack decoder for long sequences of `0xFF` values to prevent malicious use.

 https://vulnerability.circl.lu/vuln/ghsa-8v8h-hg4w-mvq2 GHSA-8v8h-hg4w-mvq2 — hpack: Unbounded variable integer decoding can cause run-away computation on malformed input 2026-09-28T17:27:04.662920+00:00

Affected: PyPI: hpack

### 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 O(n^2) runtime, effectively blocking further processing with large enough unsanitized input.

### Patches A fix is available in python-hyper/hpack v4.2.0 to restricted variable integer decoding to uint32 to prevent run-away computation.

### Workarounds Sanitize input to hpack decoder for long sequences of `0xFF` values to prevent malicious use.

 https://vulnerability.circl.lu/vuln/opensuse-su-2026:11556-1 openSUSE-SU-2026:11556-1 — python313-hpack-4.2.0-1.1 on GA media 2026-09-28T17:27:04.662970+00:00

python313-hpack-4.2.0-1.1 on GA media

 https://vulnerability.circl.lu/vuln/ubuntu-cve-2026-59980 UBUNTU-CVE-2026-59980 2026-09-28T17:27:04.663010+00:00

Affected: Ubuntu:16.04:LTS: python-hpack, Ubuntu:18.04:LTS: python-hpack, Ubuntu:20.04:LTS: python-hpack, Ubuntu:22.04:LTS: python-hpack, Ubuntu:24.04:LTS: python-hpack, Ubuntu:26.04:LTS: python-hpack

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 O(n^2) runtime, effectively blocking further processing with large enough unsanitized input. A fix is available in python-hyper/hpack v4.2.0 to restricted variable integer decoding to uint32 to prevent run-away computation. As a workaround, sanitize input to hpack decoder for long sequences of `0xFF` values to prevent malicious use.