{"schema_version":"1.7.2","id":"OESA-2026-4239","modified":"2026-10-16T11:58:29Z","published":"2026-10-16T11:58:29Z","upstream":["CVE-2026-59980"],"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)","affected":[{"package":{"ecosystem":"openEuler:22.03-LTS-SP4","name":"python-hpack","purl":"pkg:rpm/openEuler/python-hpack&distro=openEuler-22.03-LTS-SP4"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"4.0.0-2.oe2203sp4"}]}],"ecosystem_specific":{"noarch":["python3-hpack-4.0.0-2.oe2203sp4.noarch.rpm"],"src":["python-hpack-4.0.0-2.oe2203sp4.src.rpm"]}}],"references":[{"type":"ADVISORY","url":"https://www.openeuler.org/zh/security/security-bulletins/detail/?id=openEuler-SA-2026-4239"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59980"}],"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"}],"database_specific":{"severity":"Medium"}}