{"answers":{"affected":"3 open source packages ship an affected version, including pymdown-extensions.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67422 exists.","fix":"Upgrade pymdown-extensions to 11.0.1 or later.","what":"CVE-2026-67422 is a high-severity denial of service vulnerability in facelessuser pymdown-extensions, published on 6 Aug 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-2026-67422 and fix it if it is affected.\n\nWhat it is: CVE-2026-67422 is a high-severity denial of service vulnerability in facelessuser pymdown-extensions, published on 6 Aug 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.\nExploitation: It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-67422 exists.\n\nAffected packages and fixed versions:\n- pymdown-extensions (PyPI): affected all versions; fixed in 11.0.1\n- pymdown-extensions (PyPI): affected all versions; fixed in 11.0.1\n- pymdown-extensions (PyPI): affected all versions; fixed in 11.0.1\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-2026-67422/ (Markdown: https://insights.sbomify.com/CVE-2026-67422/index.md)","id":"CVE-2026-67422","markdown":"https://insights.sbomify.com/CVE-2026-67422/index.md","name":"CVE-2026-67422","record":{"aliases":["DEBIAN-CVE-2026-67422","ECHO-bc8f-97a6-da0b","GHSA-gm37-52c6-37mw","PYSEC-2026-3654","ROOT-APP-PYPI-CVE-2026-67422","UBUNTU-CVE-2026-67422"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python Markdown extension","requires_auth":"none","summary":"An attacker can cause denial of service via exponential backtracking in regular expressions when rendering untrusted Markdown input.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[],"cvss":{"score":7.5,"severity":"high","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-1333","name":"Inefficient Regular Expression Complexity"}],"description":"pymdown-extensions is a collection of extensions for the Python Markdown library. In versions up to and including 11.0, four inline processors (caret, tilde, betterem, and magiclink) use regular expressions whose content groups can partition a run of delimiter characters in exponentially many ways, causing catastrophic backtracking. As a result, a single untrusted Markdown line under 50 bytes rendered with markdown.markdown() in each extension's default configuration drives the rendering thread into unbounded CPU usage that grows exponentially with input length, enabling an unauthenticated remote attacker who can submit Markdown to cause denial of service. The exposure is concrete for web applications that render user-supplied Markdown (comments, wikis, issue bodies, live preview), including any app using pymdownx.extra which bundles the vulnerable betterem default, as well as hosted docs/CI systems that build untrusted Markdown. The issue has been fixed in version 11.0.1.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":null,"github_poc":0,"max_poc_stars":null,"metasploit":0,"nuclei":0,"refs":[],"tier":"weaponised"},"has_fix":true,"headline":"pymdown-extensions: Exponential-backtracking ReDoS in caret, tilde, betterem, and magiclink inline processors","id":"CVE-2026-67422","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":null,"products":[],"type":"denial_of_service","year":"2026"},"n_packages":3,"n_references":2,"next":{"headline":"Flyto2 Core: Guarded HTTP modules follow redirects into internal space without per-hop SSRF revalidation","id":"CVE-2026-67424"},"packages":[{"ecosystem":"PyPI","fixed":["11.0.1"],"introduced":["0"],"last_affected":[],"package":"pymdown-extensions","purl":null,"source":"GHSA-gm37-52c6-37mw"},{"ecosystem":"PyPI","fixed":["11.0.1"],"introduced":["0"],"last_affected":[],"package":"pymdown-extensions","purl":"pkg:pypi/pymdown-extensions","source":"GHSA-gm37-52c6-37mw"},{"ecosystem":"PyPI","fixed":["11.0.1"],"introduced":["0"],"last_affected":[],"package":"pymdown-extensions","purl":"pkg:pypi/pymdown-extensions","source":"PYSEC-2026-3654"}],"prev":{"headline":"RabbitMQ: Stored HTML Injection in RabbitMQ Management OAuth Error Handling","id":"CVE-2026-67421"},"products":["pymdown-extensions"],"published":"2026-08-06","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":"CC BY 4.0","name":"PyPA Advisory Database","prefix":"PYSEC"},{"class":"attribution","licence":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"poc","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-08-07","vendors":["facelessuser"]},"summary":"An attacker can cause denial of service via exponential backtracking in regular expressions when rendering untrusted Markdown input.","url":"https://insights.sbomify.com/CVE-2026-67422/"}