{"answers":{"affected":"6 open source packages ship an affected version, including puma, ruby and ruby-min. It affects 4 products.","exploited":"There is no known exploitation of CVE-2020-5247 in the wild and no public exploit code.","fix":"Upgrade puma to a fixed version for your release line: 3.12.4 or 4.3.3.","what":"CVE-2020-5247 is a medium-severity vulnerability in Debian Debian Linux, published on 28 Feb 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2020-5247 and fix it if it is affected.\n\nWhat it is: CVE-2020-5247 is a medium-severity vulnerability in Debian Debian Linux, published on 28 Feb 2020. Any signed-in user can exploit it over the network, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2020-5247 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- puma (RubyGems): affected all versions; fixed in 3.12.4\n- puma (RubyGems): affected all versions; fixed in 3.12.4\n- puma (RubyGems): affected from 4.0.0; fixed in 4.3.3\n- puma (RubyGems): affected from 4.0.0; fixed in 4.3.3\n- ruby (Bitnami): affected all versions; fixed in 2.3.1, 2.4.8, 2.5.7, 2.6.5\n- ruby-min (Bitnami): affected all versions; fixed in 2.3.1, 2.4.8, 2.5.7, 2.6.5\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-2020-5247/ (Markdown: https://insights.sbomify.com/CVE-2020-5247/index.md)","id":"CVE-2020-5247","markdown":"https://insights.sbomify.com/CVE-2020-5247/index.md","name":"CVE-2020-5247","record":{"aliases":["BIT-ruby-2020-5247","BIT-ruby-min-2020-5247","DEBIAN-CVE-2020-5247","GHSA-84j7-475p-hp8v"],"analysis":{"component_type":"server_software","fix_type":"upgrade","impacts":["code_execution","security_bypass"],"network_reachable":"yes","non_default_config":false,"product_category":"Ruby web server","requires_auth":"low_privilege","summary":"Attackers can inject malicious content into HTTP responses via newline characters in headers, potentially leading to XSS or cache poisoning.","user_interaction":"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"},{"product":"ruby","vendor":"ruby-lang"}],"cvss":{"score":6.5,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:R/S:C/C:L/I:L/A:L","version":"3.1"},"cwes":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component"},{"id":"CWE-113","name":"Improper Neutralization of CRLF Sequences in HTTP Headers"}],"description":"In Puma (RubyGem) before 4.3.2 and before 3.12.3, if an application using Puma allows untrusted input in a response header, an attacker can use newline characters (i.e. `CR`, `LF` or`/r`, `/n`) to end the header and inject malicious content, such as additional headers or an entirely new response body. This vulnerability is known as HTTP Response Splitting. While not an attack in itself, response splitting is a vector for several other attacks, such as cross-site scripting (XSS). This is related to CVE-2019-16254, which fixed this vulnerability for the WEBrick Ruby web server. This has been fixed in versions 4.3.2 and 3.12.3 by checking all headers for line endings and rejecting headers with those characters.","ecosystems":["Bitnami","RubyGems"],"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":"HTTP Response Splitting in Puma","id":"CVE-2020-5247","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"Bitnami","product":"debian:debian_linux","products":["debian:debian_linux","fedoraproject:fedora","ruby-lang:ruby"],"type":"other","year":"2020"},"n_packages":6,"n_references":7,"next":{"headline":"Public GLPIKEY can be used to decrypt any data in GLPI","id":"CVE-2020-5248"},"packages":[{"ecosystem":"Bitnami","fixed":["2.3.1","2.4.8","2.5.7","2.6.5"],"introduced":["0","2.4.0","2.5.0","2.6.0"],"last_affected":[],"package":"ruby","purl":"pkg:bitnami/ruby","source":"BIT-ruby-2020-5247"},{"ecosystem":"Bitnami","fixed":["2.3.1","2.4.8","2.5.7","2.6.5"],"introduced":["0","2.4.0","2.5.0","2.6.0"],"last_affected":[],"package":"ruby-min","purl":"pkg:bitnami/ruby-min","source":"BIT-ruby-min-2020-5247"},{"ecosystem":"RubyGems","fixed":["3.12.4"],"introduced":["0"],"last_affected":[],"package":"puma","purl":null,"source":"GHSA-84j7-475p-hp8v"},{"ecosystem":"RubyGems","fixed":["3.12.4"],"introduced":["0"],"last_affected":[],"package":"puma","purl":"pkg:gem/puma","source":"GHSA-84j7-475p-hp8v"},{"ecosystem":"RubyGems","fixed":["4.3.3"],"introduced":["4.0.0"],"last_affected":[],"package":"puma","purl":null,"source":"GHSA-84j7-475p-hp8v"},{"ecosystem":"RubyGems","fixed":["4.3.3"],"introduced":["4.0.0"],"last_affected":[],"package":"puma","purl":"pkg:gem/puma","source":"GHSA-84j7-475p-hp8v"}],"prev":{"headline":"LDAP injection vulnerability in Traccar GPS Tracking System","id":"CVE-2020-5246"},"products":["Puma"],"published":"2020-02-28","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":"Apache-2.0","name":"Bitnami","prefix":"BIT"},{"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)"}],"ssvc":{"automatable":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2024-08-04","vendors":["puma"]},"summary":"Attackers can inject malicious content into HTTP responses via newline characters in headers, potentially leading to XSS or cache poisoning.","url":"https://insights.sbomify.com/CVE-2020-5247/"}