{"answers":{"affected":"2 open source packages ship an affected version, including md-to-pdf. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-23639 in the wild and no public exploit code.","fix":"Upgrade md-to-pdf to 5.0.0 or later.","what":"CVE-2021-23639 is a critical code injection vulnerability in md-to-pdf, published on 10 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-23639 and fix it if it is affected.\n\nWhat it is: CVE-2021-23639 is a critical code injection vulnerability in md-to-pdf, published on 10 Dec 2021. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: There is no known exploitation of CVE-2021-23639 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- md-to-pdf (npm): affected all versions; fixed in 5.0.0\n- md-to-pdf (npm): affected all versions; fixed in 5.0.0\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-2021-23639/ (Markdown: https://insights.sbomify.com/CVE-2021-23639/index.md)","id":"CVE-2021-23639","markdown":"https://insights.sbomify.com/CVE-2021-23639/index.md","name":"CVE-2021-23639","record":{"aliases":["GHSA-x949-7cm6-fm6p","SNYK-JS-MDTOPDF-1657880"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Node.js PDF generator","requires_auth":"none","summary":"Attackers can execute arbitrary code via malicious front matter in Markdown files due to unsafe JS engine usage in the md-to-pdf library.","user_interaction":"not_required","vuln_class":"code_injection"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"snyk","cpe":[{"product":"markdown_to_pdf","vendor":"markdown_to_pdf_project"}],"cvss":{"score":9.8,"severity":"critical","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","version":"3.1"},"cwes":[],"description":"The package md-to-pdf before 5.0.0 are vulnerable to Remote Code Execution (RCE) due to utilizing the library gray-matter to parse front matter content, without disabling the JS engine.","ecosystems":["npm"],"exploits":{"exploitdb":0,"first_seen":"2024-10-04","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2024-10-04T14:02:46Z","kind":"github_poc","ref":"https://github.com/MohandAcherir/CVE-2021-23639","stars":0,"title":"Exploit of CVE-2021-23639 for the vulnerable library 'md-to-pdf' in JS"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Remote Code Execution (RCE)","id":"CVE-2021-23639","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"npm","product":null,"products":[],"type":"code_injection","year":"2021"},"n_packages":2,"n_references":3,"next":{"headline":"Cross-site Scripting (XSS)","id":"CVE-2021-23648"},"packages":[{"ecosystem":"npm","fixed":["5.0.0"],"introduced":["0"],"last_affected":[],"package":"md-to-pdf","purl":null,"source":"GHSA-x949-7cm6-fm6p"},{"ecosystem":"npm","fixed":["5.0.0"],"introduced":["0"],"last_affected":[],"package":"md-to-pdf","purl":"pkg:npm/md-to-pdf","source":"GHSA-x949-7cm6-fm6p"}],"prev":{"headline":"Remote Code Execution (RCE)","id":"CVE-2021-23632"},"products":["md-to-pdf"],"published":"2021-12-10","related":[],"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":"US public information, NVD API terms","name":"NVD"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-09-17","vendors":["n/a"]},"summary":"Attackers can execute arbitrary code via malicious front matter in Markdown files due to unsafe JS engine usage in the md-to-pdf library.","url":"https://insights.sbomify.com/CVE-2021-23639/"}