{"id":"OESA-2026-4242","summary":"python-hpack security update","details":"hpack provides a simple Python interface to the HPACK compression algorithm,used to compress HTTP headers in HTTP/2.Used by some of the most populer HTTP/2 implementations in Python,HPACK offers a great Python interface as well as optional upgrade to optimised C-based compression routines from nghttp2.\r\n\r\nSecurity Fix(es):\n\nhpack 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.(CVE-2026-59980)","modified":"2026-10-16T12:15:04.189697601Z","published":"2026-10-16T11:58:31Z","upstream":["CVE-2026-59980"],"database_specific":{"severity":"Medium"},"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4242"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59980"}],"affected":[{"package":{"name":"python-hpack","ecosystem":"openEuler:24.03-LTS-SP4","purl":"pkg:rpm/openEuler/python-hpack&distro=openEuler-24.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.0-3.oe2403sp4"}]}],"ecosystem_specific":{"noarch":["python3-hpack-4.0.0-3.oe2403sp4.noarch.rpm"],"src":["python-hpack-4.0.0-3.oe2403sp4.src.rpm"]},"database_specific":{"source":"https://repo.openeuler.org/security/data/osv/OESA-2026-4242.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N"}]}