{"action":"Upgrade hpack to 4.2.0 or later.","affected":[{"fixed":"4.2.0","introduced":"0"}],"component":"hpack","cve_ids":["CVE-2026-59980"],"ecosystem":"PyPI","epss":0.00302,"exploited":false,"fixed_versions":["4.2.0"],"ghsa_id":"GHSA-8v8h-hg4w-mvq2","id":"tcs_01M5KH9H2762YK73QNFBJ9FJEW","modified_at":"2026-10-01T17:45:03.832893385Z","published_at":"2026-10-01T16:38:39.106369Z","references":["https://osv.dev/vulnerability/PYSEC-2026-4053","https://github.com/python-hyper/hpack/security/advisories/GHSA-8v8h-hg4w-mvq2","https://nvd.nist.gov/vuln/detail/CVE-2026-59980","https://github.com/python-hyper/hpack/commit/8cfb02c547740e16dbfe7aba77bad84b297cec2c","https://cs.opensource.google/go/x/net/+/master:http2/hpack/hpack.go;l=468;drc=8e2b117aee74f6b86c207a808b0255de45c0a18a","https://docs.rs/http2/0.5.19/src/http2/hpack/decoder.rs.html#403","https://github.com/python-hyper/hpack","https://github.com/python-hyper/hpack/releases/tag/v4.2.0","https://pypi.org/project/hpack","https://github.com/advisories/GHSA-8v8h-hg4w-mvq2"],"severity":{"label":"medium","score":6.3},"sources":[{"source":"osv","source_id":"PYSEC-2026-4053","url":"https://osv.dev/vulnerability/PYSEC-2026-4053"},{"source":"nvd","source_id":"CVE-2026-59980","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-59980"}],"summary":"hpack: Unbounded variable integer decoding can cause run-away computation on malformed input"}