{"answers":{"affected":"6 open source packages ship an affected version, including activesupport. It affects 1 product.","exploited":"There is no known exploitation of CVE-2026-33170 in the wild and no public exploit code.","fix":"Upgrade activesupport to a fixed version for your release line: 7.2.3.1, 8.0.4.1 or 8.1.2.1.","what":"CVE-2026-33170 is a medium-severity cross-site scripting vulnerability in Rubyonrails Rails, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link."},"fix_prompt":"Check this codebase for CVE-2026-33170 and fix it if it is affected.\n\nWhat it is: CVE-2026-33170 is a medium-severity cross-site scripting vulnerability in Rubyonrails Rails, published on 23 Mar 2026. An attacker can exploit it over the internet without logging in, and only if a user opens a file or follows a link.\nExploitation: There is no known exploitation of CVE-2026-33170 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- activesupport (RubyGems): affected all versions; fixed in 7.2.3.1\n- activesupport (RubyGems): affected all versions; fixed in 7.2.3.1\n- activesupport (RubyGems): affected from 8.0.0.beta1; fixed in 8.0.4.1\n- activesupport (RubyGems): affected from 8.0.0.beta1; fixed in 8.0.4.1\n- activesupport (RubyGems): affected from 8.1.0.beta1; fixed in 8.1.2.1\n- activesupport (RubyGems): affected from 8.1.0.beta1; fixed in 8.1.2.1\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-2026-33170/ (Markdown: https://insights.sbomify.com/CVE-2026-33170/index.md)","id":"CVE-2026-33170","markdown":"https://insights.sbomify.com/CVE-2026-33170/index.md","name":"CVE-2026-33170","record":{"aliases":["DEBIAN-CVE-2026-33170","GHSA-89vf-4333-qx8v","MINI-9vj3-xj58-j29g","MINI-pxrv-47vx-xg3p","MINI-r9x8-q49h-x8mq","UBUNTU-CVE-2026-33170"],"analysis":{"component_type":"library","fix_type":"patch","impacts":["code_execution"],"network_reachable":"yes","non_default_config":false,"product_category":"Ruby on Rails library","requires_auth":"none","summary":"Attackers can inject malicious scripts via SafeBuffer formatting, bypassing auto-escaping and leading to XSS in Rails applications.","user_interaction":"required","vuln_class":"xss"},"analysis_generated_by":"qwen3.8-flash-next","assigner":"GitHub_M","cpe":[{"product":"rails","vendor":"rubyonrails"}],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:P/VC:N/VI:L/VA:N/SC:N/SI:N/SA:N","version":"4.0"},"cwes":[{"id":"CWE-79","name":"Improper Neutralization of Input During Web Page Generation"}],"description":"Active Support is a toolkit of support libraries and Ruby core extensions extracted from the Rails framework. Prior to versions 8.1.2.1, 8.0.4.1, and 7.2.3.1, `SafeBuffer#%` does not propagate the `@html_unsafe` flag to the newly created buffer. If a `SafeBuffer` is mutated in place (e.g. via `gsub!`) and then formatted with `%` using untrusted arguments, the result incorrectly reports `html_safe? == true`, bypassing ERB auto-escaping and possibly leading to XSS. Versions 8.1.2.1, 8.0.4.1, and 7.2.3.1 contain a patch.","ecosystems":["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":"Rails Active Support has a possible XSS vulnerability in SafeBuffer#%","id":"CVE-2026-33170","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":"rubyonrails:rails","products":["rubyonrails:rails"],"type":"xss","year":"2026"},"n_packages":6,"n_references":7,"next":{"headline":"Statamic has a path traversal in file dictionary fieldtype","id":"CVE-2026-33171"},"packages":[{"ecosystem":"RubyGems","fixed":["7.2.3.1"],"introduced":["0"],"last_affected":[],"package":"activesupport","purl":null,"source":"GHSA-89vf-4333-qx8v"},{"ecosystem":"RubyGems","fixed":["7.2.3.1"],"introduced":["0"],"last_affected":[],"package":"activesupport","purl":"pkg:gem/activesupport","source":"GHSA-89vf-4333-qx8v"},{"ecosystem":"RubyGems","fixed":["8.0.4.1"],"introduced":["8.0.0.beta1"],"last_affected":[],"package":"activesupport","purl":null,"source":"GHSA-89vf-4333-qx8v"},{"ecosystem":"RubyGems","fixed":["8.0.4.1"],"introduced":["8.0.0.beta1"],"last_affected":[],"package":"activesupport","purl":"pkg:gem/activesupport","source":"GHSA-89vf-4333-qx8v"},{"ecosystem":"RubyGems","fixed":["8.1.2.1"],"introduced":["8.1.0.beta1"],"last_affected":[],"package":"activesupport","purl":null,"source":"GHSA-89vf-4333-qx8v"},{"ecosystem":"RubyGems","fixed":["8.1.2.1"],"introduced":["8.1.0.beta1"],"last_affected":[],"package":"activesupport","purl":"pkg:gem/activesupport","source":"GHSA-89vf-4333-qx8v"}],"prev":{"headline":"Rails Active Support has a possible ReDoS vulnerability in number_to_delimited","id":"CVE-2026-33169"},"products":["activesupport"],"published":"2026-03-23","related":[{"cvss_score":10,"headline":"Active Record contains deserialization of arbitrary YAML","id":"CVE-2013-0277","kev_date_added":null,"published":"2013-02-13"},{"cvss_score":8.1,"headline":"SQL injection in n/a","id":"CVE-2017-17916","kev_date_added":null,"published":"2017-12-29"},{"cvss_score":8.1,"headline":"SQL injection in n/a","id":"CVE-2017-17917","kev_date_added":null,"published":"2017-12-29"},{"cvss_score":8,"headline":"Rails Active Storage has possible Path Traversal in DiskService","id":"CVE-2026-33195","kev_date_added":null,"published":"2026-03-23"},{"cvss_score":7.5,"headline":"Rails possible ReDoS vulnerability in Accept header parsing in Action Dispatch","id":"CVE-2024-26142","kev_date_added":null,"published":"2024-02-27"},{"cvss_score":7.5,"headline":"ReDoS based DoS vulnerability in Action Dispatch","id":"CVE-2023-22792","kev_date_added":null,"published":"2023-02-09"},{"cvss_score":7.5,"headline":"Denial of Service in Action Dispatch","id":"CVE-2021-22902","kev_date_added":null,"published":"2021-06-11"}],"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)"}],"ssvc":{"automatable":"no","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-03-25","vendors":["rails"]},"summary":"Attackers can inject malicious scripts via SafeBuffer formatting, bypassing auto-escaping and leading to XSS in Rails applications.","url":"https://insights.sbomify.com/CVE-2026-33170/"}