{"id":"DEBIAN-CVE-2026-97689","details":"urllib3 is an HTTP client library for Python. From 1.10.3 until 2.8.0, the HTTPResponse.read_chunked and HTTPResponse.stream methods can allocate unbounded memory because the streaming chunk parser buffers the chunk-size field until newline or EOF without a length bound. The trigger is that a malicious server returns Transfer-Encoding: chunked followed by a very long run of bytes without a newline. The attack mechanism is that a malicious HTTP server sends a very long unterminated chunk-size line. The impact is that unbounded memory allocation can exhaust the client process. This issue is fixed in version 2.8.0.","modified":"2026-09-30T05:01:19.358836882Z","published":"2026-09-29T16:17:18.837Z","upstream":["CVE-2026-97689"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2026-97689"}],"affected":[{"package":{"name":"python-urllib3","ecosystem":"Debian:12","purl":"pkg:deb/debian/python-urllib3?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["1.26.12-1","1.26.12-1+deb12u1","1.26.12-1+deb12u2","1.26.12-1+deb12u3","1.26.12-1+deb12u4","1.26.16-1","1.26.17-1","1.26.18-1","1.26.18-2","2.0.7-1","2.0.7-2","2.2.3-1","2.2.3-2","2.2.3-3","2.2.3-4","2.3.0-1","2.3.0-2","2.3.0-3","2.5.0-1","2.5.0-1.1","2.5.0-2","2.6.3-1","2.6.3-2","2.7.0-1","2.7.0-2","2.7.0-3","2.8.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-97689.json"}},{"package":{"name":"python-urllib3","ecosystem":"Debian:13","purl":"pkg:deb/debian/python-urllib3?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"}]}],"versions":["2.3.0-3","2.3.0-3+deb13u1","2.3.0-3+deb13u2","2.5.0-1","2.5.0-1.1","2.5.0-2","2.6.3-1","2.6.3-2","2.7.0-1","2.7.0-2","2.7.0-3","2.8.0-1"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-97689.json"}},{"package":{"name":"python-urllib3","ecosystem":"Debian:14","purl":"pkg:deb/debian/python-urllib3?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"2.8.0-1"}]}],"versions":["2.3.0-3","2.5.0-1","2.5.0-1.1","2.5.0-2","2.6.3-1","2.6.3-2","2.7.0-1","2.7.0-2","2.7.0-3"],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-97689.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:H/SC:N/SI:N/SA:H/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X"}]}