{"action":"Upgrade python-urllib3 to 1.26.5-1~exp1 or later.","affected":[{"fixed":"1.26.5-1~exp1","introduced":"0"}],"component":"python-urllib3","cve_ids":[],"ecosystem":"Debian","ecosystem_qualifier":"Debian:14","exploited":false,"fixed_versions":["1.26.5-1~exp1"],"id":"tcs_01M5NFQQTCD0RS39ZSWJ0S1R0P","modified_at":"2026-10-23T18:03:28.904333024Z","published_at":"2021-06-29T11:15:07.847Z","references":["https://osv.dev/vulnerability/DEBIAN-CVE-2021-33503","https://security-tracker.debian.org/tracker/CVE-2021-33503"],"severity":{"label":"high","score":7.5},"sources":[{"source":"osv","source_id":"DEBIAN-CVE-2021-33503#Debian:14/python-urllib3","url":"https://osv.dev/vulnerability/DEBIAN-CVE-2021-33503"}],"summary":"An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking,"}