{"id":"CVE-2026-44889","summary":"WebOb: Location header normalization during redirect leads to open redirect","details":"WebOb provides objects for HTTP requests and responses. Prior to 1.8.10, the normalization of the HTTP Location header during a redirect is vulnerable to an open redirect: WebOb joins the redirect target to the request URI using Python's urljoin, and since Python 3.10 the underlying urlsplit strips ASCII tab, carriage return, and newline characters before parsing, so a redirect target containing such characters can be reinterpreted as a protocol-relative URL whose authority is an attacker-controlled host. This bypasses the CVE-2024-42353 fix that escaped a leading double slash, allowing an attacker who influences the redirect location to send users to an arbitrary external site instead of the intended one. This vulnerability is fixed in 1.8.10.","aliases":["GHSA-fh3h-vg37-cc95","PYSEC-2026-251"],"modified":"2026-07-15T10:14:47.162599546Z","published":"2026-06-22T21:30:11.789Z","related":["CGA-673j-g68x-g98x","SUSE-SU-2026:22370-1","SUSE-SU-2026:2982-1","openSUSE-SU-2026:11041-1","openSUSE-SU-2026:21063-1"],"database_specific":{"cna_assigner":"GitHub_M","cwe_ids":["CWE-601"],"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44889.json"},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/44xxx/CVE-2026-44889.json"},{"type":"ADVISORY","url":"https://github.com/Pylons/webob/security/advisories/GHSA-fh3h-vg37-cc95"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-44889"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/pylons/webob","events":[{"introduced":"0"},{"fixed":"b240857958df492ef71bb00fb4b5365ecd92480a"}],"database_specific":{"source":["AFFECTED_FIELD","CPE_RANGE"],"cpe":"cpe:2.3:a:pylonsproject:webob:*:*:*:*:*:*:*:*","extracted_events":[{"introduced":"0"},{"fixed":"1.8.10"}]}}],"versions":["1.8.9","1.8.8","1.8.7","1.8.6","1.8.5","1.8.4","v1.8.3","1.8.3","v1.8.2","1.8.2","1.8.1","1.8.0","1.8.0rc1","1.4","1.5.0a0","1.3.1","1.3","1.2","1.2rc1","1.2b3","1.2b2","1.2b1","1.2a2","1.2a1","1.1","1.1rc1","1.1b2","1.0.8","1.0.7","1.0.6","1.0.5","1.0.4","1.0.3","1.0.2","1.0.1","0.9.8","0.9.7.1","0.9.7","0.9.6.1","0.9.6","0.9.5","0.9.4","0.9.3","0.9.2","0.9.1","0.9","0.8.5","0.8.4","0.8.3","0.8.2","0.8.1","0.8"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-44889.json"}}],"schema_version":"1.7.5","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N"}]}