{"answers":{"affected":"2 open source packages ship an affected version, including bleach.","exploited":"There is no known exploitation of GHSA-8rfp-98v4-mmr6 in the wild and no public exploit code.","fix":"Upgrade bleach to 6.4.0 or later.","what":"GHSA-8rfp-98v4-mmr6 is a cross-site scripting vulnerability in bleach, published on 16 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for GHSA-8rfp-98v4-mmr6 and fix it if it is affected.\n\nWhat it is: GHSA-8rfp-98v4-mmr6 is a cross-site scripting vulnerability in bleach, published on 16 Jun 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of GHSA-8rfp-98v4-mmr6 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- bleach (PyPI): affected all versions; fixed in 6.4.0\n- bleach (PyPI): affected all versions; fixed in 6.4.0\n\nTask:\n1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.\n2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.\n3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.\n4. Run the tests and summarise what changed and why.\n5. If nothing in the project is affected, say so and change nothing.\n\nReference: https://insights.sbomify.com/GHSA-8rfp-98v4-mmr6/ (Markdown: https://insights.sbomify.com/GHSA-8rfp-98v4-mmr6/index.md)","id":"GHSA-8rfp-98v4-mmr6","markdown":"https://insights.sbomify.com/GHSA-8rfp-98v4-mmr6/index.md","name":"GHSA-8rfp-98v4-mmr6","record":{"aliases":[],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Python HTML sanitizer","requires_auth":"none","summary":"Bleach sanitizer fails to strip disallowed URI schemes containing Unicode characters, potentially allowing XSS if downstream systems normalize the output.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":null,"cpe":[],"cvss":{"score":null,"severity":null,"source":null,"vector":null,"version":null},"cwes":[],"description":"### 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 = '\u003ca href=\"javascript\\u200b:alert(document.cookie)\"\u003eClick me\u003c/a\u003e'\nresult1 = bleach.clean(payload1)\nprint(f\"(ZWSP): {repr(result1)}\")\n```\n\nOutput:\n\n```\n(ZWSP): '\u003ca href=\"javascript\\u200b:alert(document.cookie)\"\u003eClick me\u003c/a\u003e'\n```\n\n### Patches\n\nUsers should upgrade to Bleach 6.4.0.\n\n### Workarounds\n\nPre-process content removing non-ASCII characters from URI schemes before sanitizing with `bleach.clean`.\n\nA strong[ Content-Security-Policy](https://developer.mozilla.org/en-US/docs/Web/HTTP/CSP) without unsafe-inline and unsafe-eval[ script-srcs](https://developer.mozilla.org/en-US/docs/Web/HTTP/Headers/Content-Security-Policy/script-src) will also help mitigate the risk.\n\n### References\n\n* https://bugzilla.mozilla.org/show_bug.cgi?id=2023812\n* RFC 3986, Section 3.1 (URI Scheme syntax): scheme characters are restricted to ALPHA *( ALPHA / DIGIT / \"+\" / \"-\" / \".\" )\n\n### Reported by \n\nReported by codeant from CodeAnt AI.","ecosystems":["PyPI"],"exploits":{"exploitdb":null,"first_seen":null,"github_poc":null,"max_poc_stars":null,"metasploit":null,"nuclei":null,"refs":[],"tier":null},"has_fix":true,"headline":"Bleach: URI sanitization allows disallowed URI schemes with Unicode \u003e U+00A0 in output","id":"GHSA-8rfp-98v4-mmr6","indexable":true,"kev":null,"kind":"advisory","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":null,"packages":[{"ecosystem":"PyPI","fixed":["6.4.0"],"introduced":["0"],"last_affected":[],"package":"bleach","purl":null,"source":"GHSA-8rfp-98v4-mmr6"},{"ecosystem":"PyPI","fixed":["6.4.0"],"introduced":["0"],"last_affected":[],"package":"bleach","purl":"pkg:pypi/bleach","source":"GHSA-8rfp-98v4-mmr6"}],"products":null,"published":"2026-06-16","related":[],"sources":[{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":null,"updated":null,"vendors":null},"summary":"Bleach sanitizer fails to strip disallowed URI schemes containing Unicode characters, potentially allowing XSS if downstream systems normalize the output.","url":"https://insights.sbomify.com/GHSA-8rfp-98v4-mmr6/"}