{"items":[{"id":"NVI-00018540","kind":"vulnerability","title":"Bleach: URI sanitization allows disallowed URI schemes with Unicode > U+00A0 in output","revision":1,"unknowns":["Customer inventory, deployment, reachability and exploitation have not been inspected."],"lifecycle":"active","identifiers":["GHSA-8rfp-98v4-mmr6"],"plain_summary":"GitHub lists this reviewed advisory for bleach. Published version ranges and source prerequisites are shown below; this is not an inspection of a visitor’s application.","review_status":"source_listed","control_topics":[],"public_actions":[{"summary":"Identify the exact component and deployed version, examine the linked publisher’s conditions, and retain evidence of any mitigation.","source_ids":["sr-38d88c641ea0cb262c4bc5ad8977e08f"],"action_type":"investigate","limitations":"Confirm current vendor support, compatibility and deployment evidence. This report has not tested a fix in your system.","current_supported_target":null}],"schema_version":"1.1.0","source_metrics":[],"why_it_matters":"Published affected context helps an owner decide what evidence to gather. This report has not examined your application.","related_sources":[{"id":"sr-38d88c641ea0cb262c4bc5ad8977e08f","url":"https://github.com/advisories/GHSA-8rfp-98v4-mmr6","basis":"vendor_advisory","notes":"GitHub Advisory Database; CC-BY-4.0. Each advisory links its original attribution. Null normalizes fields.","title":"GHSA-8rfp-98v4-mmr6","publisher":"GitHub Advisory Database","observed_at":"2026-11-06T07:20:20.042Z"}],"affected_context":[{"certainty":"source_listed","source_ids":["sr-38d88c641ea0cb262c4bc5ad8977e08f"],"technology":"bleach","known_exclusions":[],"conditions_summary":"### Impact\n\nA possible XSS bypass affects users calling `bleach.clean` with all of:\n\n* `a` in the allowed tags\n* `href` in allowed attributes\n\nThe `bleach.clean` sanitizer outputs URIs containing disallowed scheme patterns that it should be stripping. However, because the inserted Unicode characters make the scheme invalid per RFC 3986, modern browsers do not execute these as javascript: URIs. The practical security impact is limited to:\n\n- Bleach's output contains URI values that violate the caller's protocol allowlist, breaking the sanitizer's contract.\n- If a downstream system performs its own Unicode normalization on bleach's output (stripping invisible characters before rendering), the javascript: scheme could become valid. This is a non-standard processing chain but represents a theoretical secondary risk.\n\nThis is not a direct XSS vulnerability.\n\nPython code example from reporter with Bleach v6.3.0 and Python 3.13:\n\n```\nimport bleach\npayload1 = 'Click me'\nresult1 = bleach.clean(payload1)\nprint(f\"(ZWSP): {repr(result1)}\")\n```\n\nOutput:\n\n```\n(ZWSP): 'Click me'\n```\n\n### Pa","public_affected_ranges":["<= 6.3.0"]}],"null_published_at":"2026-11-07T07:07:39.850Z","source_updated_at":"2026-06-16T14:06:31.000Z","source_disclosed_at":"2026-06-16T14:06:29.000Z","is_synthetic_fixture":false,"null_last_reviewed_at":null,"public_change_summary":"First indexed by Null; source disclosure date is shown separately.","null_first_observed_at":"2026-11-06T07:20:20.042Z"}],"next_cursor":null,"snapshot_revision":"42594"}