{"answers":{"affected":"3 open source packages ship an affected version, including mistune.","exploited":"It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-33079 exists.","fix":"Upgrade mistune to 3.2.1 or later.","what":"CVE-2026-33079 is a high-severity denial of service vulnerability in lepture mistune, published on 6 May 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-2026-33079 and fix it if it is affected.\n\nWhat it is: CVE-2026-33079 is a high-severity denial of service vulnerability in lepture mistune, published on 6 May 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-2026-33079 exists.\n\nAffected packages and fixed versions:\n- mistune (PyPI): affected from 3.0.0a1; fixed in 3.2.1\n- mistune (PyPI): affected from 3.0.0a1; fixed in 3.2.1\n- mistune (PyPI): affected from 3.0.0a1; fixed in 3.2.1\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-2026-33079/ (Markdown: https://insights.sbomify.com/CVE-2026-33079/index.md)","id":"CVE-2026-33079","markdown":"https://insights.sbomify.com/CVE-2026-33079/index.md","name":"CVE-2026-33079","record":{"aliases":["AZL-86318","CLEANSTART-2026-LT48571","CLEANSTART-2026-RE32707","DEBIAN-CVE-2026-33079","GHSA-8mp2-v27r-99xp","PYSEC-2026-2651","UBUNTU-CVE-2026-33079"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python Markdown parser","requires_auth":"none","summary":"Attackers can cause denial of service in applications using Mistune by supplying crafted Markdown that triggers catastrophic regex backtracking.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","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-1333","name":"Inefficient Regular Expression Complexity"}],"description":"In versions 3.0.0a1 through 3.2.0 of Mistune, there is a ReDoS (Regular Expression Denial of Service) vulnerability in `LINK_TITLE_RE` that allows an attacker who can supply Markdown for parsing to cause denial of service. The regular expression used for parsing link titles contains overlapping alternatives that can trigger catastrophic backtracking. In both the double-quoted and single-quoted branches, a backslash followed by punctuation can be matched either as an escaped punctuation sequence or as two ordinary characters, creating an ambiguous pattern inside a repeated group. If an attacker supplies Markdown containing repeated ! sequences with no closing quote, the regex engine explores an exponential number of backtracking paths. This is reachable through normal Markdown parsing of inline links and block link reference definitions. A small crafted input can therefore cause significant CPU consumption and make applications using Mistune unresponsive.","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":"Mistune ReDoS in LINK_TITLE_RE allows denial of service with crafted Markdown titles","id":"CVE-2026-33079","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":"Filament: Unvalidated Range and Values summarizer values can be used for XSS","id":"CVE-2026-33080"},"packages":[{"ecosystem":"PyPI","fixed":["3.2.1"],"introduced":["3.0.0a1"],"last_affected":[],"package":"mistune","purl":null,"source":"GHSA-8mp2-v27r-99xp"},{"ecosystem":"PyPI","fixed":["3.2.1"],"introduced":["3.0.0a1"],"last_affected":[],"package":"mistune","purl":"pkg:pypi/mistune","source":"GHSA-8mp2-v27r-99xp"},{"ecosystem":"PyPI","fixed":["3.2.1"],"introduced":["3.0.0a1"],"last_affected":[],"package":"mistune","purl":"pkg:pypi/mistune","source":"PYSEC-2026-2651"}],"prev":{"headline":"Roxy-WI has SQL Injection in haproxy_section_save Endpoint via Unsanitized server_ip Parameter","id":"CVE-2026-33078"},"products":["mistune"],"published":"2026-05-06","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":"2026-08-28","vendors":["lepture"]},"summary":"Attackers can cause denial of service in applications using Mistune by supplying crafted Markdown that triggers catastrophic regex backtracking.","url":"https://insights.sbomify.com/CVE-2026-33079/"}