{"answers":{"affected":"2 open source packages ship an affected version, including league/commonmark. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-33347 in the wild and no public exploit code.","fix":"Upgrade league/commonmark to 2.8.2 or later.","what":"CVE-2026-33347 is a medium-severity vulnerability in thephpleague commonmark, published on 24 Mar 2026. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2026-33347 and fix it if it is affected.\n\nWhat it is: CVE-2026-33347 is a medium-severity vulnerability in thephpleague commonmark, published on 24 Mar 2026. 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-2026-33347 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- league/commonmark (Packagist): affected from 2.3.0; fixed in 2.8.2\n- league/commonmark (Packagist): affected from 2.3.0; fixed in 2.8.2\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-2026-33347/ (Markdown: https://insights.sbomify.com/CVE-2026-33347/index.md)","id":"CVE-2026-33347","markdown":"https://insights.sbomify.com/CVE-2026-33347/index.md","name":"CVE-2026-33347","record":{"aliases":["DEBIAN-CVE-2026-33347","GHSA-hh8v-hgvp-g3f5","UBUNTU-CVE-2026-33347"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["security_bypass","code_execution"],"network_reachable":"yes","non_default_config":true,"product_category":"PHP Markdown parser","requires_auth":"none","summary":"Attackers can bypass domain allowlists in the Embed extension, potentially enabling SSRF or XSS via malicious domains.","user_interaction":"not_required","vuln_class":"security_feature_bypass"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"commonmark","vendor":"thephpleague"}],"cvss":{"score":6.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-918","name":"Server-Side Request Forgery"},{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"},{"id":"CWE-185","name":"Incorrect Regular Expression"}],"description":"league/commonmark is a PHP Markdown parser. From version 2.3.0 to before version 2.8.2, the DomainFilteringAdapter in the Embed extension is vulnerable to an allowlist bypass due to a missing hostname boundary assertion in the domain-matching regex. An attacker-controlled domain like youtube.com.evil passes the allowlist check when youtube.com is an allowed domain. This issue has been patched in version 2.8.2.","ecosystems":["Packagist"],"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":"league/commonmark has an embed extension allowed_domains bypass","id":"CVE-2026-33347","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"security_feature_bypass","year":"2026"},"n_packages":2,"n_references":3,"next":{"headline":"OpenEMR has Stored XSS in patient encounter Eye Exam form $CHRONIC2 and $CHRONIC3","id":"CVE-2026-33348"},"packages":[{"ecosystem":"Packagist","fixed":["2.8.2"],"introduced":["2.3.0"],"last_affected":[],"package":"league/commonmark","purl":null,"source":"GHSA-hh8v-hgvp-g3f5"},{"ecosystem":"Packagist","fixed":["2.8.2"],"introduced":["2.3.0"],"last_affected":[],"package":"league/commonmark","purl":"pkg:composer/league/commonmark","source":"GHSA-hh8v-hgvp-g3f5"}],"prev":{"headline":"OpenEMR has stored XSS in portal_payment.php via Unescaped table_args","id":"CVE-2026-33346"},"products":["commonmark"],"published":"2026-03-24","related":[{"cvss_score":8.7,"headline":"commonmark 1.5.0 before 2.10.0 Denial of Service via Attributes","id":"CVE-2026-86428","kev_date_added":null,"published":"2026-09-07"},{"cvss_score":8.7,"headline":"commonmark before 2.9.1 Denial of Service via SmartPunct and Attributes","id":"CVE-2026-86429","kev_date_added":null,"published":"2026-09-07"},{"cvss_score":8.7,"headline":"league/commonmark before 2.9.1 Denial of Service via parsing","id":"CVE-2026-86430","kev_date_added":null,"published":"2026-09-07"},{"cvss_score":6.9,"headline":"commonmark before 2.9.1 XSS via AttributesExtension form feed bypass","id":"CVE-2026-86431","kev_date_added":null,"published":"2026-09-07"},{"cvss_score":6.1,"headline":"Moderate severity vulnerability that affects league/commonmark","id":"CVE-2019-10010","kev_date_added":null,"published":"2019-03-24"},{"cvss_score":6.1,"headline":"PHP League CommonMark vulnerable to Cross-Site Scripting (XSS)","id":"CVE-2018-20583","kev_date_added":null,"published":"2018-12-30"}],"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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-26","vendors":["thephpleague"]},"summary":"Attackers can bypass domain allowlists in the Embed extension, potentially enabling SSRF or XSS via malicious domains.","url":"https://insights.sbomify.com/CVE-2026-33347/"}