{"id":"CVE-2026-44889","aliases":["AZL-91362","DEBIAN-CVE-2026-44889","EUVD-2026-38391","GHSA-fh3h-vg37-cc95","MGASA-2026-0452","OESA-2026-2679","PYSEC-2026-251","SUSE-SU-2026:22370-1","SUSE-SU-2026:2982-1","UBUNTU-CVE-2026-44889","USN-8759-1","openSUSE-SU-2026:11041-1","openSUSE-SU-2026:21063-1"],"status":"published","title":"WebOb: Location header normalization during redirect leads to open redirect","description":"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.","severity":{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna","from":"cve"},"epss":{"day":"2026-11-10","score":0.00269,"percentile":0.19192,"model":"v2026.06.15"},"facts":{"in_kev":false,"known_exploited":false,"public_exploit":false,"fix_available":true},"cwes":["CWE-601"],"published":"2026-06-04T14:33:35Z","modified":"2026-10-28T02:31:13Z","fixes":[{"ecosystem":"PyPI","package":"webob","fixed_in":["1.8.10"],"sources":["ghsa","osv"]},{"ecosystem":"Azure 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Location header normalization during redirect leads to open redirect","description":"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.","status":"published","published":"2026-06-22T21:30:11.789Z","modified":"2026-06-23T15:05:27.698Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"cna"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T13:43:00.288193Z"}],"euvd":[{"id":"EUVD-2026-38391","description":"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.","status":"published","published":"2026-06-22T21:30:11Z","modified":"2026-06-23T15:05:27Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T18:20:33.324654Z"}],"ghsa":[{"id":"GHSA-fh3h-vg37-cc95","title":"WebOb: Location header normalization during redirect leads to open redirect - again","description":"### Impact\n\nWhen WebOb normalizes the HTTP Location header to include the request hostname, it does so by parsing the URL that the user is to be redirected to with Python's `urllib.parse`, and joining it to the base URL. `urlsplit` (called internally by `urljoin`) however treats a `//` at the start of a string as a URI without a scheme, and then treats the next part as the hostname. `urljoin` will then use that hostname from the second part as the hostname replacing the original one from the request.\n\nIn a previous advisory https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3 an attempt to fix this was made by forcing the replacement of `//` with `/%2f`, however this did not take into account that since Python 3.10 `urlsplit` internally strips ASCII tab, carriage return, and newline characters from the string, so `/\\t/attacker.com` gets turned into `//attacker.com` and the attacker is able to bypass the changes introduced in that previous advisory, thereby bringing back the problem that was attempted to be fixed.\n\n```\n\u003e\u003e\u003e parse.urlparse(\"//attacker.com/some/path\")\nParseResult(scheme='', netloc='attacker.com', path='/some/path', params='', query='', fragment='')\n```\n\nWebOb uses `urljoin` to take the request URI and join the redirect location to it, so assuming the request URI is `https://example.org/` and the URL to redirect to is `/\\t/attacker.com/some/path/`:\n\n```\n\u003e\u003e\u003e parse.urljoin(\"https://example.org/\", \"/\\t/attacker.com/some/path/\")\n'https://attacker.com/some/path/'\n```\n\nWhich redirects from `example.org` where we want the user to stay to `attacker.com`.\n\n### Patches\n\nThis issue has been fixed in WebOb 1.8.10.\n\n### Workarounds\n\nAny use of the `Response` class that includes a `location` can be rewritten to make sure to always pass a full URI that includes the hostname to redirect the user to, or to validate that the redirect target starts with a scheme (e.g. `http://` or `https://`) before assigning to `Response.location`.\n\n### References\n\n- https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3\n- CVE-2024-42353\n\n### Thanks\n\n- Caleb Brown of Google","status":"published","published":"2026-06-04T14:33:35Z","modified":"2026-07-18T17:27:39Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:40:46.257074Z"}],"nvd":[{"id":"CVE-2026-44889","description":"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.","status":"published","published":"2026-06-22T22:16:46.35Z","modified":"2026-10-25T23:10:00.167Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium","assessor":"secondary"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T14:12:25.288279Z"}],"osv":[{"id":"CVE-2026-44889","title":"WebOb: Location header normalization during redirect leads to open redirect","description":"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.","status":"published","published":"2026-06-22T21:30:11.789Z","modified":"2026-10-28T02:31:13.658813959Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:45:05.172514Z"},{"id":"DEBIAN-CVE-2026-44889","description":"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.","status":"published","published":"2026-06-22T22:16:46.35Z","modified":"2026-10-26T11:47:29.056938749Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:45:55.669088Z"},{"id":"GHSA-fh3h-vg37-cc95","title":"WebOb: Location header normalization during redirect leads to open redirect - again","description":"### Impact\n\nWhen WebOb normalizes the HTTP Location header to include the request hostname, it does so by parsing the URL that the user is to be redirected to with Python's `urllib.parse`, and joining it to the base URL. `urlsplit` (called internally by `urljoin`) however treats a `//` at the start of a string as a URI without a scheme, and then treats the next part as the hostname. `urljoin` will then use that hostname from the second part as the hostname replacing the original one from the request.\n\nIn a previous advisory https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3 an attempt to fix this was made by forcing the replacement of `//` with `/%2f`, however this did not take into account that since Python 3.10 `urlsplit` internally strips ASCII tab, carriage return, and newline characters from the string, so `/\\t/attacker.com` gets turned into `//attacker.com` and the attacker is able to bypass the changes introduced in that previous advisory, thereby bringing back the problem that was attempted to be fixed.\n\n```\n\u003e\u003e\u003e parse.urlparse(\"//attacker.com/some/path\")\nParseResult(scheme='', netloc='attacker.com', path='/some/path', params='', query='', fragment='')\n```\n\nWebOb uses `urljoin` to take the request URI and join the redirect location to it, so assuming the request URI is `https://example.org/` and the URL to redirect to is `/\\t/attacker.com/some/path/`:\n\n```\n\u003e\u003e\u003e parse.urljoin(\"https://example.org/\", \"/\\t/attacker.com/some/path/\")\n'https://attacker.com/some/path/'\n```\n\nWhich redirects from `example.org` where we want the user to stay to `attacker.com`.\n\n### Patches\n\nThis issue has been fixed in WebOb 1.8.10.\n\n### Workarounds\n\nAny use of the `Response` class that includes a `location` can be rewritten to make sure to always pass a full URI that includes the hostname to redirect the user to, or to validate that the redirect target starts with a scheme (e.g. `http://` or `https://`) before assigning to `Response.location`.\n\n### References\n\n- https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3\n- CVE-2024-42353\n\n### Thanks\n\n- Caleb Brown of Google","status":"published","published":"2026-06-04T14:33:35Z","modified":"2026-09-10T03:50:49.442249208Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"cwes":["CWE-601"],"updated_at":"2026-11-02T15:46:46.39441Z"},{"id":"OESA-2026-2679","title":"python-webob security update","description":"WebOb provides wrappers around the WSGI request environment, and an object to help create WSGI responses. The objects map much of the specified behavior of HTTP, including header parsing and accessors for other standard parts of the environment.\r\n\r\nSecurity Fix(es):\n\n### Impact\n\nWhen WebOb normalizes the HTTP Location header to include the request hostname, it does so by parsing the URL that the user is to be redirected to with Python\u0026apos;s `urllib.parse`, and joining it to the base URL. `urlsplit` (called internally by `urljoin`) however treats a `//` at the start of a string as a URI without a scheme, and then treats the next part as the hostname. `urljoin` will then use that hostname from the second part as the hostname replacing the original one from the request.\n\nIn a previous advisory https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3 an attempt to fix this was made by forcing the replacement of `//` with `/%2f`, however this did not take into account that since Python 3.10 `urlsplit` internally strips ASCII tab, carriage return, and newline characters from the string, so `/\\t/attacker.com` gets turned into `//attacker.com` and the attacker is able to bypass the changes introduced in that previous advisory, thereby bringing back the problem that was attempted to be fixed.\n\n```\n\u0026gt;\u0026gt;\u0026gt; parse.urlparse(\u0026quot;//attacker.com/some/path\u0026quot;)\nParseResult(scheme=\u0026apos;\u0026apos;, netloc=\u0026apos;attacker.com\u0026apos;, path=\u0026apos;/some/path\u0026apos;, params=\u0026apos;\u0026apos;, query=\u0026apos;\u0026apos;, fragment=\u0026apos;\u0026apos;)\n```\n\nWebOb uses `urljoin` to take the request URI and join the redirect location to it, so assuming the request URI is `https://example.org/` and the URL to redirect to is `/\\t/attacker.com/some/path/`:\n\n```\n\u0026gt;\u0026gt;\u0026gt; parse.urljoin(\u0026quot;https://example.org/\u0026quot;, \u0026quot;/\\t/attacker.com/some/path/\u0026quot;)\n\u0026apos;https://attacker.com/some/path/\u0026apos;\n```\n\nWhich redirects from `example.org` where we want the user to stay to `attacker.com`.\n\n### Patches\n\nThis issue has been fixed in WebOb 1.8.10.\n\n### Workarounds\n\nAny use of the `Response` class that includes a `location` can be rewritten to make sure to always pass a full URI that includes the hostname to redirect the user to, or to validate that the redirect target starts with a scheme (e.g. `http://` or `https://`) before assigning to `Response.location`.\n\n### References\n\n- https://github.com/Pylons/webob/security/advisories/GHSA-mg3v-6m49-jhp3\n- CVE-2024-42353\n\n### Thanks\n\n- Caleb Brown of Google(CVE-2026-44889)","status":"published","published":"2026-06-12T11:11:36Z","modified":"2026-08-18T01:20:05.641673355Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:46.449097Z"},{"id":"PYSEC-2026-251","description":"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.","status":"published","published":"2026-06-22T22:16:46.35Z","modified":"2026-06-27T11:15:06.80275075Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T15:52:55.961245Z"},{"id":"UBUNTU-CVE-2026-44889","description":"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.","status":"published","published":"2026-06-22T22:16:00Z","modified":"2026-09-16T14:02:43.903914598Z","cvss":[{"version":"3.1","score":6.1,"vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","level":"medium"}],"updated_at":"2026-11-02T16:56:26.396868Z"},{"id":"AZL-91362","title":"CVE-2026-44889 affecting package python-webob for versions less than 1.8.10-1","description":"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.","status":"published","published":"2026-06-22T22:16:46Z","modified":"2026-08-28T17:56:36.276733Z","updated_at":"2026-11-02T15:28:11.397546Z"},{"id":"MGASA-2026-0452","title":"Updated python-webob packages fix a security vulnerability","description":"Location header normalization during redirect leads to open redirect -\nagain\n","status":"published","published":"2026-09-25T05:02:40Z","modified":"2026-09-25T05:15:03.32594058Z","updated_at":"2026-11-02T15:49:43.795591Z"},{"id":"openSUSE-SU-2026:11041-1","title":"python-WebOb-doc-1.8.10-1.1 on GA media","description":"These are all security issues fixed in the python-WebOb-doc-1.8.10-1.1 package on the GA media of openSUSE Tumbleweed.","status":"published","published":"2026-06-16T00:00:00Z","modified":"2026-06-17T09:15:06.81791208Z","updated_at":"2026-11-02T16:58:38.95195Z"},{"id":"openSUSE-SU-2026:21063-1","title":"Security update for python-Markdown, python-joblib, python-handy-archives, python-apache-libcloud, python-WebOb, python-PyGithub, python-soupsieve","description":"This update for python-Markdown, python-joblib, python-handy-archives, python-apache-libcloud, python-WebOb, python-PyGithub, python-soupsieve fixes the following issues:\n\nChanges in python-Markdown:\n\n- Fix tests with latest python version (bsc#1268243)\n\nChanges in python-joblib:\n\n- Update to 1.5.2:\n    * fixing the resource tracker for python 3.13.7+\n    * Skip tests failing with Python 3.13.7\n\nChanges in python-handy-archives:\n\n- Skip some zip64 tests that fails with latest python interpreter\n  because there are more consistency checks in zipfile (bsc#1256310)\n\nChanges in python-apache-libcloud:\n\n- Fix tests compatibility with latest Python 3.13 (bsc#1258223, bsc#1261918)\n\nChanges in python-WebOb:\n\n- Security issues fixed:\n    * CVE-2026-44889: Fixed: Location header normalization during redirect leads\n      to open redirect (bsc#1268324)\n- Skip boken test with latest cpython interpreters  (bsc#1258223)\n- Skip test failing on Python 3.14\n\nChanges in python-PyGithub:\n\n- Fix: [SUSE:SLFO:Main] python-PyGithub fails to build on aarch64, ppc64le, s390x, x86_64 (bsc#1263802)\n\nChanges in python-soupsieve:\n\n- Fix: [SUSE:SLFO:Main] python-soupsieve:test fails to build on aarch64, ppc64le, s390x, x86_64 (bsc#1256316)\n","status":"published","published":"2026-06-26T07:41:11Z","modified":"2026-06-30T18:24:38.456183476Z","updated_at":"2026-11-02T16:58:41.885092Z"},{"id":"SUSE-SU-2026:22370-1","title":"Security update for python-Markdown, python-joblib, python-handy-archives, python-apache-libcloud, python-WebOb, python-PyGithub, python-soupsieve","description":"This update for python-Markdown, python-joblib, python-handy-archives, python-apache-libcloud, python-WebOb, python-PyGithub, python-soupsieve fixes the following issues:\n\nChanges in python-Markdown:\n\n- Fix tests with latest python version (bsc#1268243)\n\nChanges in python-joblib:\n\n- Update to 1.5.2:\n    * fixing the resource tracker for python 3.13.7+\n    * Skip tests failing with Python 3.13.7\n\nChanges in python-handy-archives:\n\n- Skip some zip64 tests that fails with latest python interpreter\n  because there are more consistency checks in zipfile (bsc#1256310)\n\nChanges in python-apache-libcloud:\n\n- Fix tests compatibility with latest Python 3.13 (bsc#1258223, bsc#1261918)\n\nChanges in python-WebOb:\n\n- Security issues fixed:\n    * CVE-2026-44889: Fixed: Location header normalization during redirect leads\n      to open redirect (bsc#1268324)\n- Skip boken test with latest cpython interpreters  (bsc#1258223)\n- Skip test failing on Python 3.14\n\nChanges in python-PyGithub:\n\n- Fix: [SUSE:SLFO:Main] python-PyGithub fails to build on aarch64, ppc64le, s390x, x86_64 (bsc#1263802)\n\nChanges in python-soupsieve:\n\n- Fix: [SUSE:SLFO:Main] python-soupsieve:test fails to build on aarch64, ppc64le, s390x, x86_64 (bsc#1256316)\n","status":"published","published":"2026-06-26T07:40:20Z","modified":"2026-07-02T18:24:14.942601309Z","updated_at":"2026-11-02T15:54:03.080707Z"},{"id":"SUSE-SU-2026:2982-1","title":"Security update for python-WebOb","description":"This update for python-WebOb fixes the following issue\n\n- CVE-2026-44889: Location header normalization during redirect leads to open redirect (bsc#1268324).\n","status":"published","published":"2026-07-14T13:15:38Z","modified":"2026-07-15T10:00:08.837560552Z","updated_at":"2026-11-02T15:54:04.987808Z"},{"id":"USN-8759-1","title":"python-webob vulnerabilities","description":"It was discovered that WebOb incorrectly handled certain URLs. An\nattacker could possibly use this issue to control a redirect or forward\nto another URL. This issue was only addressed in Ubuntu 16.04 LTS and\nUbuntu 18.04 LTS. (CVE-2024-42353)\n\nCaleb Brown discovered that WebOb incorrectly handled certain URLs. An\nattacker could possibly use this issue to control a redirect or forward\nto another URL. (CVE-2026-44889)","status":"published","published":"2026-09-15T06:58:35Z","modified":"2026-09-16T14:12:34.855135711Z","updated_at":"2026-11-02T16:58:26.907654Z"}]}}