{"action":"Upgrade h11 to 0.16.0 or later.","affected":[{"fixed":"0.16.0","introduced":"0"}],"component":"h11","cve_ids":["CVE-2025-43859"],"ecosystem":"PyPI","epss":0.00594,"exploited":false,"fixed_versions":["0.16.0"],"ghsa_id":"GHSA-vqfr-h8mv-ghfj","id":"tcs_01M5KH5JJVDXNJ6JP32R0MGEHN","modified_at":"2026-07-01T20:22:54.082067Z","published_at":"2026-06-29T11:50:35.684909Z","references":["https://osv.dev/vulnerability/PYSEC-2026-348","https://github.com/python-hyper/h11/security/advisories/GHSA-vqfr-h8mv-ghfj","https://nvd.nist.gov/vuln/detail/CVE-2025-43859","https://github.com/python-hyper/h11/commit/114803a29ce50116dc47951c690ad4892b1a36ed","https://github.com/python-hyper/h11","https://pypi.org/project/h11","https://github.com/advisories/GHSA-vqfr-h8mv-ghfj"],"severity":{"label":"critical","score":9.1},"sources":[{"source":"osv","source_id":"PYSEC-2026-348","url":"https://osv.dev/vulnerability/PYSEC-2026-348"}],"summary":"h11 accepts some malformed Chunked-Encoding bodies"}