{"answers":{"affected":"3 open source packages ship an affected version, including mistune. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-59929 in the wild and no public exploit code.","fix":"Upgrade mistune to 3.3.0 or later.","what":"CVE-2026-59929 is a medium-severity cross-site scripting vulnerability in lepture mistune, published on 8 Jul 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 CVE-2026-59929 and fix it if it is affected.\n\nWhat it is: CVE-2026-59929 is a medium-severity cross-site scripting vulnerability in lepture mistune, published on 8 Jul 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 CVE-2026-59929 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- mistune (PyPI): affected all versions; fixed in 3.3.0\n- mistune (PyPI): affected all versions; fixed in 3.3.0\n- mistune (PyPI): affected all versions; fixed in 3.3.0\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/CVE-2026-59929/ (Markdown: https://insights.sbomify.com/CVE-2026-59929/index.md)","id":"CVE-2026-59929","markdown":"https://insights.sbomify.com/CVE-2026-59929/index.md","name":"CVE-2026-59929","record":{"aliases":["DEBIAN-CVE-2026-59929","ECHO-714c-15f5-a448","GHSA-qfrw-5rxm-mhh2","PYSEC-2026-2217","UBUNTU-CVE-2026-59929"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Python Markdown parser","requires_auth":"none","summary":"Attackers can inject malicious scripts via unsafe URL schemes in rendered Markdown, leading to code execution in user browsers.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"mistune","vendor":"mistune_project"}],"cvss":{"score":6.1,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:C/C:L/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"},{"id":"CWE-184","name":"Incomplete List of Disallowed Inputs"}],"description":"Mistune is a Python Markdown parser with renderers and plugins. Prior to 3.3.0, the safe_url filter in src/mistune/renderers/html.py blocks only javascript:, vbscript:, file:, and data: schemes, allowing legacy or chained schemes such as feed:, view-source:, jar:, livescript:, mocha:, ms-its:, mk:, and res: to reach rendered href and src attributes and potentially execute script in affected user agents. This issue is fixed in version 3.3.0.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"none_known"},"has_fix":true,"headline":"Mistune renderers/html.safe_url: HARMFUL_PROTOCOLS list misses legacy and chained schemes that historically chain to `javascript:` execution","id":"CVE-2026-59929","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":3,"n_references":3,"next":{"headline":"Mistune toc / TableOfContents directive: heading IDs use predictable `toc_N` numbering with no slugification, allowing collision with attacker-controlled `id=\"toc_N\"` content","id":"CVE-2026-59930"},"packages":[{"ecosystem":"PyPI","fixed":["3.3.0"],"introduced":["0"],"last_affected":[],"package":"mistune","purl":null,"source":"GHSA-qfrw-5rxm-mhh2"},{"ecosystem":"PyPI","fixed":["3.3.0"],"introduced":["0"],"last_affected":[],"package":"mistune","purl":"pkg:pypi/mistune","source":"GHSA-qfrw-5rxm-mhh2"},{"ecosystem":"PyPI","fixed":["3.3.0"],"introduced":["0"],"last_affected":[],"package":"mistune","purl":"pkg:pypi/mistune","source":"PYSEC-2026-2217"}],"prev":{"headline":"Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions","id":"CVE-2026-59928"},"products":["mistune"],"published":"2026-07-08","related":[{"cvss_score":7.5,"headline":"Mistune plugins/formatting: quadratic-time parsing on long runs of `~~x~~`, `==x==`, and `^^x^^` markers (strikethrough / mark / insert)","id":"CVE-2026-59922","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":7.5,"headline":"inline_parser: quadratic-time parsing on long runs of `**x**` and `***x***` emphasis pairs","id":"CVE-2026-59925","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":7.5,"headline":"Mistune block_parser: quadratic-time parsing on long lists of repeated reference-link definitions","id":"CVE-2026-59928","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":6.1,"headline":"Mistune: XSS via percent-encoded javascript URI bypass in safe_url()","id":"CVE-2026-59923","kev_date_added":null,"published":"2026-07-08"},{"cvss_score":6.1,"headline":"Mistune Math Plugin XSS Escape Bypass","id":"CVE-2026-44708","kev_date_added":null,"published":"2026-05-26"},{"cvss_score":6.1,"headline":"Mistune Heading ID Attribute Injection XSS","id":"CVE-2026-44897","kev_date_added":null,"published":"2026-05-26"}],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"class":"attribution","licence":"CC BY 4.0","name":"GitHub Advisory Database","prefix":"GHSA"},{"class":"attribution","licence":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-07-09","vendors":["lepture"]},"summary":"Attackers can inject malicious scripts via unsafe URL schemes in rendered Markdown, leading to code execution in user browsers.","url":"https://insights.sbomify.com/CVE-2026-59929/"}