Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass

{
  "id": "50d689ee1a53e4028126f8e53c7e99e4a38025b393a34565821aeb5783374df8",
  "url": "https://osv.dev/vulnerability/CVE-2026-52842",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "Lightpanda:URL parser misidentifies page origin for URLs containing @ in the path - Same-Origin Policy bypass",
    "summary": "Lightpanda is a headless browser designed for AI and automation. Prior to 0.3.1, Lightpanda searched for @ across the entire URL string instead of only the authority component when computing a page origin, so a URL such as `http://attacker.com/@victim.com/` was fetched from attacker.com but treated as `http://victim.com`, allowing a complete Same-Origin Policy bypass. This issue is fixed in version 0.3.1.",
    "evidence": "osv:CVE-2026-52842",
    "products": [],
    "severity": "critical",
    "structured": {
      "id": "CVE-2026-52842",
      "aliases": [
        "CVE-2026-52842",
        "GHSA-mq6p-m9cc-q432"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:H/I:H/A:N"
        }
      ],
      "affected": [
        {
          "ranges": [
            {
              "repo": "https://github.com/lightpanda-io/browser",
              "type": "GIT",
              "events": [
                {
                  "introduced": "0"
                },
                {
                  "fixed": "85d84c296ed592a0a924c8dee3426dbf7881b560"
                },
                {
                  "fixed": "0588cc374d4af9687cf6f45a7d52f7af04bbacfb"
                }
              ],
              "database_specific": {
                "extracted_events": [
                  {
                    "range": [
                      {
                        "introduced": "0"
                      },
                      {
                        "fixed": "0.3.1"
                      }
                    ],
                    "source": "AFFECTED_FIELD",
                    "strategy": "StringRangeExpression"
                  },
                  {
                    "range": [
                      {
                        "fixed": "0588cc374d4af9687cf6f45a7d52f7af04bbacfb"
                      }
                    ],
                    "source": "REFERENCES_COMMIT"
                  },
                  {
                    "range": [
                      {
                        "fixed": "85d84c296ed592a0a924c8dee3426dbf7881b560"
                      }
                    ],
                    "source": "REFERENCES_TAG",
                    "original_tag": "0.3.1"
                  }
                ]
              }
            }
          ],
          "versions": [
            "0.3.0",
            "0.2.9",
            "0.2.8",
            "0.2.7",
            "v0.2.6",
            "v0.2.5",
            "v0.2.4",
            "v0.2.3",
            "v0.2.2",
            "v0.2.1",
            "v0.2.0",
            "beta",
            "nightly",
            "alpha"
          ],
          "database_specific": {
            "source": "https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-52842.json"
          }
        }
      ],
      "modified": "2026-10-28T02:30:49.708361840Z",
      "provider": "osv",
      "references": [
        "https://github.com/lightpanda-io/browser/releases/tag/0.3.1",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52842.json",
        "https://github.com/lightpanda-io/browser/security/advisories/GHSA-mq6p-m9cc-q432",
        "https://nvd.nist.gov/vuln/detail/CVE-2026-52842",
        "https://github.com/lightpanda-io/browser/commit/0588cc374d4af9687cf6f45a7d52f7af04bbacfb",
        "https://github.com/lightpanda-io/browser/pull/1998"
      ],
      "provider_metadata": {
        "cwe_ids": [
          "CWE-346"
        ],
        "cna_assigner": "GitHub_M",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/52xxx/CVE-2026-52842.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2026-52842",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 518141,
  "published_at": "2026-07-15T16:18:26.157+00:00"
}