{"answers":{"affected":"","exploited":"There is no known exploitation of CVE-2026-86435 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2026-86435 is a high-severity denial of service vulnerability in thephpleague commonmark, published on 7 Sep 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-2026-86435 and fix it if it is affected.\n\nWhat it is: CVE-2026-86435 is a high-severity denial of service vulnerability in thephpleague commonmark, published on 7 Sep 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-2026-86435 in the wild and no public exploit code.\n\nAffected product: thephpleague commonmark. No package-level version data is available, so check the vendor advisory linked from the reference page.\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-2026-86435/ (Markdown: https://insights.sbomify.com/CVE-2026-86435/index.md)","id":"CVE-2026-86435","markdown":"https://insights.sbomify.com/CVE-2026-86435/index.md","name":"CVE-2026-86435","record":{"aliases":["DEBIAN-CVE-2026-86435","GHSA-2cmp-7fm4-4v9w","UBUNTU-CVE-2026-86435"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"PHP Markdown library","requires_auth":"none","summary":"Attackers can cause denial of service in commonmark by crafting documents with duplicate footnotes, leading to resource exhaustion.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"VulnCheck","cpe":[],"cvss":{"score":8.7,"severity":"high","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-407","name":"Inefficient Algorithmic Complexity"}],"description":"commonmark versions from 1.5.0 before 2.8.4 contain a denial of service vulnerability in the Footnote extension that fails to deduplicate footnote definitions. Attackers can craft documents with duplicate footnote definitions and references to create quadratic output expansion, consuming excessive memory and CPU to exhaust server resources.","ecosystems":[],"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":"commonmark 1.5.0 before 2.8.4 Denial of Service via Footnote","id":"CVE-2026-86435","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":null,"product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":0,"n_references":2,"next":{"headline":"Lara Dashboard before 1.3.2 Missing Authorization in Post-Builder Media Upload Endpoints","id":"CVE-2026-86436"},"packages":[],"prev":{"headline":"commonmark 2.0.0 through 2.8.3 Denial of Service via Slug Collision","id":"CVE-2026-86434"},"products":["commonmark"],"published":"2026-09-07","related":[],"sources":[{"class":"attribution","licence":"CVE Terms of Use (MITRE)","name":"CVE List","prefix":"CVE"},{"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":"2026-10-08","vendors":["thephpleague"]},"summary":"Attackers can cause denial of service in commonmark by crafting documents with duplicate footnotes, leading to resource exhaustion.","url":"https://insights.sbomify.com/CVE-2026-86435/"}