{
   "document": {
      "aggregate_severity": {
         "text": "medium"
      },
      "category": "csaf_security_advisory",
      "csaf_version": "2.0",
      "distribution": {
         "tlp": {
            "label": "WHITE",
            "url": "https://www.first.org/tlp/"
         }
      },
      "lang": "en",
      "notes": [
         {
            "category": "description",
            "text": "Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter.\n\noauth2_login reads the return parameter from the initiation request, runs same_origin_path over it, and stores the survivor in the session flow record as the post-login redirect target. That check rejects a value that does not begin with a slash, one with a slash as its second byte, and one containing CR or LF. A backslash and a tab pass. The URL Standard treats a backslash as equivalent to a slash for special schemes, so `/\\evil.example` parses with the authority `evil.example`. It also strips ASCII tab before parsing, so a tab between two leading slashes leaves `//evil.example`.\n\nA crafted link to the application's own login route lands the victim on the attacker's site after a genuine authentication. The redirect carries no authorization code or access token.",
            "title": "Vulnerability Description"
         }
      ],
      "publisher": {
         "category": "other",
         "contact_details": "gdt@cpan.org",
         "name": "giterlizzi",
         "namespace": "https://github.com/giterlizzi/"
      },
      "references": [
         {
            "category": "self",
            "summary": "CPANSA-Punk-OAuth2-2026-75628 JSON",
            "url": "https://raw.githubusercontent.com/giterlizzi/perl-CPANSA-CSAF/develop/csaf/white/2026/cpansa-punk-oauth2-2026-75628.json"
         },
         {
            "category": "external",
            "summary": "https://datatracker.ietf.org/doc/html/rfc9700#section-4.11.1",
            "url": "https://datatracker.ietf.org/doc/html/rfc9700#section-4.11.1"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/LNATION/Punk-OAuth2-0.02/source/include/pox/pox_util.h#L94",
            "url": "https://metacpan.org/release/LNATION/Punk-OAuth2-0.02/source/include/pox/pox_util.h#L94"
         },
         {
            "category": "external",
            "summary": "https://metacpan.org/release/LNATION/Punk-OAuth2-0.03/changes",
            "url": "https://metacpan.org/release/LNATION/Punk-OAuth2-0.03/changes"
         },
         {
            "category": "external",
            "summary": "https://url.spec.whatwg.org/#concept-basic-url-parser",
            "url": "https://url.spec.whatwg.org/#concept-basic-url-parser"
         },
         {
            "category": "external",
            "summary": "https://url.spec.whatwg.org/#relative-slash-state",
            "url": "https://url.spec.whatwg.org/#relative-slash-state"
         },
         {
            "category": "external",
            "summary": "http://www.openwall.com/lists/oss-security/2026/08/20/1",
            "url": "http://www.openwall.com/lists/oss-security/2026/08/20/1"
         },
         {
            "category": "external",
            "summary": "CVE-2026-75628 (NVD)",
            "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-75628"
         }
      ],
      "title": "Punk-OAuth2 vulnerability",
      "tracking": {
         "current_release_date": "2026-08-20T00:00:00",
         "generator": {
            "engine": {
               "name": "CSAF Perl Toolkit",
               "version": "0.26"
            }
         },
         "id": "CPANSA-Punk-OAuth2-2026-75628",
         "initial_release_date": "2026-08-20T00:00:00",
         "revision_history": [
            {
               "date": "2026-08-20T00:00:00",
               "number": "1",
               "summary": "First release"
            }
         ],
         "status": "final",
         "version": "1"
      }
   },
   "product_tree": {
      "branches": [
         {
            "branches": [
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/<0.03",
                  "product": {
                     "name": "Punk-OAuth2 less than 0.03",
                     "product_id": "CSAFPID-0001",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Punk-OAuth2"
                     }
                  }
               },
               {
                  "category": "product_version_range",
                  "name": "vers:cpan/>=0.03",
                  "product": {
                     "name": "Punk-OAuth2 greater than or equal 0.03",
                     "product_id": "CSAFPID-0002",
                     "product_identification_helper": {
                        "purl": "pkg:cpan/Punk-OAuth2"
                     }
                  }
               }
            ],
            "category": "product_name",
            "name": "Punk-OAuth2"
         }
      ]
   },
   "vulnerabilities": [
      {
         "cve": "CVE-2026-75628",
         "cwe": {
            "id": "CWE-601",
            "name": "URL Redirection to Untrusted Site ('Open Redirect')"
         },
         "notes": [
            {
               "category": "description",
               "text": "Punk::OAuth2 versions before 0.03 for Perl allow an attacker-chosen off-site redirect after login because same_origin_path accepts a backslash or tab in the return parameter.\n\noauth2_login reads the return parameter from the initiation request, runs same_origin_path over it, and stores the survivor in the session flow record as the post-login redirect target. That check rejects a value that does not begin with a slash, one with a slash as its second byte, and one containing CR or LF. A backslash and a tab pass. The URL Standard treats a backslash as equivalent to a slash for special schemes, so `/\\evil.example` parses with the authority `evil.example`. It also strips ASCII tab before parsing, so a tab between two leading slashes leaves `//evil.example`.\n\nA crafted link to the application's own login route lands the victim on the attacker's site after a genuine authentication. The redirect carries no authorization code or access token.",
               "title": "Vulnerability Description"
            }
         ],
         "product_status": {
            "fixed": [
               "CSAFPID-0002"
            ],
            "known_affected": [
               "CSAFPID-0001"
            ]
         },
         "scores": [
            {
               "cvss_v3": {
                  "baseScore": 5.7,
                  "baseSeverity": "MEDIUM",
                  "vectorString": "CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:N/A:N",
                  "version": "3.1"
               },
               "products": [
                  "CSAFPID-0001"
               ]
            }
         ]
      }
   ]
}