{"id":"CVE-2022-36087","aliases":["GHSA-3pgj-pg6c-r5p7","PYSEC-2022-269"],"url":"https://o3.security/vulnerability/CVE-2022-36087","summary":"OAuthLib vulnerable DoS when attacker provides malicious IPV6 URI","details":"### Impact\n- Attacker providing malicious redirect uri can cause DoS to oauthlib's web application.\n- Attacker can also leverage usage of `uri_validate` functions depending where it is used.\n\n_What kind of vulnerability is it? Who is impacted?_\n\nOauthlib applications using OAuth2.0 provider support or use directly `uri_validate` function.\n\n### Patches\n_Has the problem been patched? What versions should users upgrade to?_\n\nIssue fixed in 3.2.2 release.\n\n### Workarounds\n_Is there a way for users to fix or remediate the vulnerability without upgrading?_\n\nThe `redirect_uri` can be verified in web toolkit (i.e `bottle-oauthlib`, `django-oauth-toolkit`, ...) before oauthlib is called. A sample check if `:` is present to reject the request can prevent the DoS, assuming no port or IPv6 is fundamentally required.\n\n### References\nAttack Vector:\n- Attacker providing malicious redirect uri:\nhttps://github.com/oauthlib/oauthlib/blob/d4bafd9f1d0eba3766e933b1ac598cbbf37b8914/oauthlib/oauth2/rfc6749/grant_types/base.py#L232\n- Vulnerable `uri_validate` functions:\nhttps://github.com/oauthlib/oauthlib/blob/2b8a44855a51ad5a5b0c348a08c2564a2e197ea2/oauthlib/uri_validate.py\n\n### PoC\n```python\nis_absolute_uri(\"http://[:::::::::::::::::::::::::::::::::::::::]/path\")\n```\n\n### Acknowledgement\nSpecial thanks to Sebastian Chnelik - PyUp.io","published":"2022-09-09T00:00:00Z","modified":"2026-08-12T03:51:47.119802856Z","cvss":{"score":5.7,"severity":"MEDIUM","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:N/I:N/A:H"},"epss":null,"cisaKev":null,"exploitsKnown":3,"affectedPackages":[{"ecosystem":"PyPI","name":"oauthlib","fixedVersion":"3.2.2"}],"fix":{"url":"https://github.com/oauthlib/oauthlib/commit/2e40b412c844ecc4673c3fa3f72181f228bdbacd","label":"oauthlib/oauthlib@2e40b41"},"references":[{"type":"WEB","url":"https://github.com/oauthlib/oauthlib/blob/2b8a44855a51ad5a5b0c348a08c2564a2e197ea2/oauthlib/uri_validate.py"},{"type":"WEB","url":"https://github.com/oauthlib/oauthlib/blob/d4bafd9f1d0eba3766e933b1ac598cbbf37b8914/oauthlib/oauth2/rfc6749/grant_types/base.py#L232"},{"type":"WEB","url":"https://github.com/oauthlib/oauthlib/releases/tag/v3.2.1"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2022/36xxx/CVE-2022-36087.json"},{"type":"ADVISORY","url":"https://github.com/oauthlib/oauthlib/security/advisories/GHSA-3pgj-pg6c-r5p7"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/LXOPIA6M57CFQPUT6HHSNXCTV6QA3UDI/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/NBCQJR3ZF7FVNTJYRVPVSQEQRAYZIUHU/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/QRYLYHE5HWF6R2CRLJFUK4PILR47WXOE/"},{"type":"ADVISORY","url":"https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/X2CQZM5CKOUM4GW2GTAPQEQFPITQ6F7S/"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2022-36087"},{"type":"FIX","url":"https://github.com/oauthlib/oauthlib/commit/2e40b412c844ecc4673c3fa3f72181f228bdbacd"},{"type":"PACKAGE","url":"https://github.com/oauthlib/oauthlib"},{"type":"WEB","url":"https://github.com/pypa/advisory-database/tree/main/vulns/oauthlib/PYSEC-2022-269.yaml"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/LXOPIA6M57CFQPUT6HHSNXCTV6QA3UDI"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/NBCQJR3ZF7FVNTJYRVPVSQEQRAYZIUHU"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/QRYLYHE5HWF6R2CRLJFUK4PILR47WXOE"},{"type":"WEB","url":"https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/X2CQZM5CKOUM4GW2GTAPQEQFPITQ6F7S"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-08-12T03:51:47.119802856Z"}}