{"answers":{"affected":"4 open source packages ship an affected version, including puma. It affects 3 products.","exploited":"There is no known exploitation of CVE-2020-11076 in the wild and no public exploit code.","fix":"Upgrade puma to a fixed version for your release line: 3.12.5 or 4.3.4.","what":"CVE-2020-11076 is a high-severity vulnerability in Debian Debian Linux, published on 22 May 2020. An attacker can exploit it over the internet without logging in, with no action from the victim."},"fix_prompt":"Check this codebase for CVE-2020-11076 and fix it if it is affected.\n\nWhat it is: CVE-2020-11076 is a high-severity vulnerability in Debian Debian Linux, published on 22 May 2020. 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-2020-11076 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- puma (RubyGems): affected all versions; fixed in 3.12.5\n- puma (RubyGems): affected all versions; fixed in 3.12.5\n- puma (RubyGems): affected from 4.0.0; fixed in 4.3.4\n- puma (RubyGems): affected from 4.0.0; fixed in 4.3.4\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-2020-11076/ (Markdown: https://insights.sbomify.com/CVE-2020-11076/index.md)","id":"CVE-2020-11076","markdown":"https://insights.sbomify.com/CVE-2020-11076/index.md","name":"CVE-2020-11076","record":{"aliases":["DEBIAN-CVE-2020-11076","GHSA-x7jg-6pwg-fx5h","UBUNTU-CVE-2020-11076"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["data_read","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Ruby web server","requires_auth":"none","summary":"Attackers can smuggle HTTP responses via invalid Transfer-Encoding headers, potentially bypassing security controls or accessing unauthorized data.","user_interaction":"not_required","vuln_class":"other"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"debian_linux","vendor":"debian"},{"product":"fedora","vendor":"fedoraproject"},{"product":"puma","vendor":"puma"}],"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:H/A:N","version":"3.1"},"cwes":[{"id":"CWE-444","name":"Inconsistent Interpretation of HTTP Requests"}],"description":"In Puma (RubyGem) before 4.3.4 and 3.12.5, an attacker could smuggle an HTTP response, by using an invalid transfer-encoding header. The problem has been fixed in Puma 3.12.5 and Puma 4.3.4.","ecosystems":["RubyGems"],"exploits":{"exploitdb":0,"first_seen":"2020-05-21","github_poc":1,"max_poc_stars":0,"metasploit":0,"nuclei":0,"refs":[{"date":"2020-05-21T10:55:22Z","kind":"github_poc","ref":"https://github.com/dentarg/cougar","stars":0,"title":"Puma, CVE-2020-11076 and CVE-2020-11077"}],"tier":"poc_unverified"},"has_fix":true,"headline":"HTTP Smuggling via Transfer-Encoding Header in Puma","id":"CVE-2020-11076","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":"debian:debian_linux","products":["debian:debian_linux","fedoraproject:fedora"],"type":"other","year":"2020"},"n_packages":4,"n_references":7,"next":{"headline":"HTTP Smuggling via Transfer-Encoding Header in Puma","id":"CVE-2020-11077"},"packages":[{"ecosystem":"RubyGems","fixed":["3.12.5"],"introduced":["0"],"last_affected":[],"package":"puma","purl":null,"source":"GHSA-x7jg-6pwg-fx5h"},{"ecosystem":"RubyGems","fixed":["3.12.5"],"introduced":["0"],"last_affected":[],"package":"puma","purl":"pkg:gem/puma","source":"GHSA-x7jg-6pwg-fx5h"},{"ecosystem":"RubyGems","fixed":["4.3.4"],"introduced":["4.0.0"],"last_affected":[],"package":"puma","purl":null,"source":"GHSA-x7jg-6pwg-fx5h"},{"ecosystem":"RubyGems","fixed":["4.3.4"],"introduced":["4.0.0"],"last_affected":[],"package":"puma","purl":"pkg:gem/puma","source":"GHSA-x7jg-6pwg-fx5h"}],"prev":{"headline":"Shell Escape in Anchore Engine","id":"CVE-2020-11075"},"products":["puma"],"published":"2020-05-22","related":[{"cvss_score":10,"headline":"ProFTPD Improper Access Control","id":"CVE-2015-3306","kev_date_added":"2026-10-08","published":"2015-05-18"},{"cvss_score":9.9,"headline":"RoundCube Webmail Deserialization of Untrusted Data","id":"CVE-2025-49113","kev_date_added":"2026-02-20","published":"2025-06-02"},{"cvss_score":9.8,"headline":"GNU InetUtils Argument Injection","id":"CVE-2026-24061","kev_date_added":"2026-01-26","published":"2026-01-21"},{"cvss_score":9.8,"headline":"Linux Kernel Improper Check for Unusual or Exceptional Conditions","id":"CVE-2025-39682","kev_date_added":"2026-09-18","published":"2025-09-05"},{"cvss_score":9.8,"headline":"Mozilla Firefox Use-After-Free","id":"CVE-2024-9680","kev_date_added":"2024-10-15","published":"2024-10-09"},{"cvss_score":9.8,"headline":"RARLAB UnRAR Directory Traversal","id":"CVE-2022-30333","kev_date_added":"2022-08-09","published":"2022-05-09"},{"cvss_score":9.8,"headline":"Roundcube Webmail SQL Injection","id":"CVE-2021-44026","kev_date_added":"2023-06-22","published":"2021-11-19"}],"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":"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":["puma"]},"summary":"Attackers can smuggle HTTP responses via invalid Transfer-Encoding headers, potentially bypassing security controls or accessing unauthorized data.","url":"https://insights.sbomify.com/CVE-2020-11076/"}