{"answers":{"affected":"2 open source packages ship an affected version, including league/commonmark.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105829 exists.","fix":"Upgrade league/commonmark to 2.10.2 or later.","what":"CVE-2026-105829 is a medium-severity cross-site scripting vulnerability in thephpleague commonmark, published on 8 Oct 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-2026-105829 and fix it if it is affected.\n\nWhat it is: CVE-2026-105829 is a medium-severity cross-site scripting vulnerability in thephpleague commonmark, published on 8 Oct 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: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-105829 exists.\n\nAffected packages and fixed versions:\n- league/commonmark (Packagist): affected from 1.3.0; fixed in 2.10.2\n- league/commonmark (Packagist): affected from 1.3.0; fixed in 2.10.2\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-2026-105829/ (Markdown: https://insights.sbomify.com/CVE-2026-105829/index.md)","id":"CVE-2026-105829","markdown":"https://insights.sbomify.com/CVE-2026-105829/index.md","name":"CVE-2026-105829","record":{"aliases":["CLSA-2026-1791458521","DEBIAN-CVE-2026-105829","GHSA-6vmm-7pc2-g2g6","GHSA-97jj-33gv-5xf9","UBUNTU-CVE-2026-105829"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Markdown parsing library","requires_auth":"none","summary":"Attackers can execute stored scripts in viewers' browsers by bypassing raw HTML restrictions in the League CommonMark Markdown parser.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:L/VI:L/VA:N/SC:L/SI:L/SA:N","version":"4.0"},"cwes":[{"id":"CWE-80","name":"Improper Neutralization of Script-Related HTML Tags in a Web Page"}],"description":"League CommonMark from 1.3.0 before 2.10.2 contains a cross-site scripting vulnerability that allows users posting Markdown to bypass the DisallowedRawHtml extension by ending raw HTML with a bare disallowed tag name. Attackers can place a lone \u003cscript or \u003ciframe line followed by a block supplying attributes like src or onload, executing stored scripts in viewers' browsers under default GFM settings.","ecosystems":["Packagist"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"League CommonMark 1.3.0 before 2.10.2 Stored XSS via DisallowedRawHtml Bypass","id":"CVE-2026-105829","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Packagist","product":null,"products":[],"type":"xss","year":"2026"},"n_packages":2,"n_references":2,"next":{"headline":"league/commonmark 2.0.0 before 2.10.2 Quadratic DoS via TableStartParser","id":"CVE-2026-105830"},"packages":[{"ecosystem":"Packagist","fixed":["2.10.2"],"introduced":["1.3.0"],"last_affected":[],"package":"league/commonmark","purl":null,"source":"GHSA-97jj-33gv-5xf9"},{"ecosystem":"Packagist","fixed":["2.10.2"],"introduced":["1.3.0"],"last_affected":[],"package":"league/commonmark","purl":"pkg:composer/league/commonmark","source":"GHSA-97jj-33gv-5xf9"}],"prev":{"headline":"Parse Server 9.0.0 before 9.10.1-alpha.12 Class Name Disclosure via GraphQL Errors","id":"CVE-2026-105828"},"products":["commonmark"],"published":"2026-10-08","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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"no","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-10-10","vendors":["thephpleague"]},"summary":"Attackers can execute stored scripts in viewers' browsers by bypassing raw HTML restrictions in the League CommonMark Markdown parser.","url":"https://insights.sbomify.com/CVE-2026-105829/"}