{"answers":{"affected":"3 open source packages ship an affected version, including rencode. It affects 2 products.","exploited":"There is no known exploitation of CVE-2021-40839 in the wild and no public exploit code.","fix":"Upgrade to a fixed version.","what":"CVE-2021-40839 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 10 Sep 2021. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2021-40839 and fix it if it is affected.\n\nWhat it is: CVE-2021-40839 is a high-severity denial of service vulnerability in Fedoraproject Fedora, published on 10 Sep 2021. 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-2021-40839 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- rencode (PyPI): affected all versions; no fix listed\n- rencode (PyPI): affected all versions up to 1.0.6; no fix listed\n- rencode (PyPI): affected all versions up to 1.0.6; no fix listed\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-2021-40839/ (Markdown: https://insights.sbomify.com/CVE-2021-40839/index.md)","id":"CVE-2021-40839","markdown":"https://insights.sbomify.com/CVE-2021-40839/index.md","name":"CVE-2021-40839","record":{"aliases":["DEBIAN-CVE-2021-40839","GHSA-gh8j-2pgf-x458","MGASA-2022-0167","PYSEC-2021-345","UBUNTU-CVE-2021-40839"],"analysis":{"component_type":"library","fix_type":"upgrade","impacts":["denial_of_service"],"network_reachable":"yes","non_default_config":false,"product_category":"Python rencode library","requires_auth":"none","summary":"A remote attacker can cause a denial of service by triggering an infinite loop in the rencode Python library's typecode decoding.","user_interaction":"not_required","vuln_class":"denial_of_service"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"mitre","cpe":[{"product":"fedora","vendor":"fedoraproject"},{"product":"rencode","vendor":"rencode_project"}],"cvss":{"score":7.5,"severity":"high","source":"nvd","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-835","name":"Loop with Unreachable Exit Condition"}],"description":"The rencode package through 1.0.6 for Python allows an infinite loop in typecode decoding (such as via ;\\x2f\\x7f), enabling a remote attack that consumes CPU and memory.","ecosystems":["PyPI"],"exploits":{"exploitdb":0,"first_seen":"2021-12-13","github_poc":1,"max_poc_stars":1,"metasploit":0,"nuclei":0,"refs":[{"date":"2021-12-13T09:47:22Z","kind":"github_poc","ref":"https://github.com/itlabbet/CVE-2021-40839","stars":1,"title":"Dirty Cow kernel exploit without libcrypt dependency"}],"tier":"poc_unverified"},"has_fix":true,"headline":"Infinite Loop in rencode","id":"CVE-2021-40839","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"PyPI","product":"fedoraproject:fedora","products":["fedoraproject:fedora"],"type":"denial_of_service","year":"2021"},"n_packages":3,"n_references":7,"next":{"headline":"Cross-site scripting in n/a","id":"CVE-2021-40840"},"packages":[{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":[],"package":"rencode","purl":"pkg:pypi/rencode","source":"PYSEC-2021-345"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["1.0.6"],"package":"rencode","purl":null,"source":"GHSA-gh8j-2pgf-x458"},{"ecosystem":"PyPI","fixed":[],"introduced":["0"],"last_affected":["1.0.6"],"package":"rencode","purl":"pkg:pypi/rencode","source":"GHSA-gh8j-2pgf-x458"}],"prev":{"headline":"Denial-of-Service (DoS) Vulnerability","id":"CVE-2021-40837"},"products":["n/a"],"published":"2021-09-10","related":[{"cvss_score":9.8,"headline":"PHP-CGI OS Command Injection","id":"CVE-2024-4577","kev_date_added":"2024-06-12","published":"2024-06-09"},{"cvss_score":9.8,"headline":"Grafana Authentication Bypass","id":"CVE-2021-39226","kev_date_added":"2022-08-25","published":"2021-10-05"},{"cvss_score":9.8,"headline":"VMware ESXi and Horizon DaaS OpenSLP Heap-Based Buffer Overflow","id":"CVE-2019-5544","kev_date_added":"2021-11-03","published":"2019-12-06"},{"cvss_score":9.6,"headline":"Google Chromium V8 Type Confusion","id":"CVE-2024-4947","kev_date_added":"2024-05-20","published":"2024-05-15"},{"cvss_score":9.6,"headline":"Google Chromium Visuals Use-After-Free","id":"CVE-2024-4671","kev_date_added":"2024-05-13","published":"2024-05-09"},{"cvss_score":9.6,"headline":"Google Chromium Mojo Insufficient Data Validation","id":"CVE-2022-3075","kev_date_added":"2022-09-08","published":"2022-09-26"},{"cvss_score":9.6,"headline":"Google Chromium Indexed DB API Use-After-Free","id":"CVE-2021-30633","kev_date_added":"2021-11-03","published":"2021-10-08"}],"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":"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)"},{"class":"open","licence":"CC0","name":"PoC-in-GitHub"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["n/a"]},"summary":"A remote attacker can cause a denial of service by triggering an infinite loop in the rencode Python library's typecode decoding.","url":"https://insights.sbomify.com/CVE-2021-40839/"}