{"answers":{"affected":"3 open source packages ship an affected version, including comrak. It affects 1 product.","exploited":"There is no known exploitation of CVE-2021-27671 in the wild and no public exploit code.","fix":"Upgrade comrak to 0.9.1 or later.","what":"CVE-2021-27671 is a medium-severity cross-site scripting vulnerability in n/a, published on 25 Feb 2021. 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-2021-27671 and fix it if it is affected.\n\nWhat it is: CVE-2021-27671 is a medium-severity cross-site scripting vulnerability in n/a, published on 25 Feb 2021. 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-2021-27671 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- comrak (crates.io): affected all versions; fixed in 0.9.1\n- comrak (crates.io): affected all versions; fixed in 0.9.1\n- comrak (crates.io): affected from 0.0.0-0; fixed in 0.9.1\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-2021-27671/ (Markdown: https://insights.sbomify.com/CVE-2021-27671/index.md)","id":"CVE-2021-27671","markdown":"https://insights.sbomify.com/CVE-2021-27671/index.md","name":"CVE-2021-27671","record":{"aliases":["GHSA-xmr7-v725-2jjr","RUSTSEC-2021-0026"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Rust Markdown Parser","requires_auth":"none","summary":"Attackers can execute arbitrary scripts via case-sensitive URI bypasses in the comrak Rust library, affecting applications rendering untrusted Markdown.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"comrak","vendor":"comrak_project"}],"cvss":{"score":6.1,"severity":"medium","source":"nvd","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"}],"description":"An issue was discovered in the comrak crate before 0.9.1 for Rust. XSS can occur because the protection mechanism for data: and javascript: URIs is case-sensitive, allowing (for example) Data: to be used in an attack.","ecosystems":["crates.io"],"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":"Cross site scripting in comrak","id":"CVE-2021-27671","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"crates.io","product":null,"products":[],"type":"xss","year":"2021"},"n_packages":3,"n_references":1,"next":{"headline":"SQL Injection in tribalsystems/zenario","id":"CVE-2021-27672"},"packages":[{"ecosystem":"crates.io","fixed":["0.9.1"],"introduced":["0"],"last_affected":[],"package":"comrak","purl":null,"source":"GHSA-xmr7-v725-2jjr"},{"ecosystem":"crates.io","fixed":["0.9.1"],"introduced":["0"],"last_affected":[],"package":"comrak","purl":"pkg:cargo/comrak","source":"GHSA-xmr7-v725-2jjr"},{"ecosystem":"crates.io","fixed":["0.9.1"],"introduced":["0.0.0-0"],"last_affected":[],"package":"comrak","purl":"pkg:cargo/comrak","source":"RUSTSEC-2021-0026"}],"prev":{"headline":"Server-side request forgery in n/a","id":"CVE-2021-27670"},"products":["n/a"],"published":"2021-02-25","related":[{"cvss_score":6.1,"headline":"Cross-site Scripting in comrak","id":"CVE-2021-38186","kev_date_added":null,"published":"2021-08-08"},{"cvss_score":5.3,"headline":"Quadratic runtime when parsing Markdown in comrak","id":"CVE-2023-28626","kev_date_added":null,"published":"2023-03-28"},{"cvss_score":5.3,"headline":"Attacker controlled data in AST nodes is not validated in comrak","id":"CVE-2023-28631","kev_date_added":null,"published":"2023-03-28"}],"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":"open","licence":"CC0 1.0","name":"RustSec","prefix":"RUSTSEC"},{"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-03","vendors":["n/a"]},"summary":"Attackers can execute arbitrary scripts via case-sensitive URI bypasses in the comrak Rust library, affecting applications rendering untrusted Markdown.","url":"https://insights.sbomify.com/CVE-2021-27671/"}