{"answers":{"affected":"2 open source packages ship an affected version, including activesupport.","exploited":"There is no known exploitation of CVE-2026-126080 in the wild and no public exploit code.","exposure":"","fix":"Upgrade activesupport to a fixed version for your release line: 8.0.5.2 or 8.1.4.1.","what":"CVE-2026-126080 is a high-severity vulnerability in rails, published on 10 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-126080 and fix it if it is affected.\n\nWhat it is: CVE-2026-126080 is a high-severity vulnerability in rails, published on 10 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-126080 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- activesupport (RubyGems): affected all versions; fixed in 8.0.5.2\n- activesupport (RubyGems): affected from 8.1.0.beta1; fixed in 8.1.4.1\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-2026-126080/ (Markdown: https://insights.sbomify.com/CVE-2026-126080/index.md)","id":"CVE-2026-126080","markdown":"https://insights.sbomify.com/CVE-2026-126080/index.md","name":"CVE-2026-126080","record":{"aliases":["DEBIAN-CVE-2026-126080","GHSA-8474-xrp6-wh69","UBUNTU-CVE-2026-126080"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"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:N/A:H","version":"3.1"},"cwes":[{"id":"CWE-74","name":"Improper Neutralization of Special Elements in Output Used by a Downstream Component"}],"description":"Active Support is a collection of utility classes and standard library extensions used by Rails and other Ruby projects. Prior to 8.1.4.1 and 8.0.5.2, when constant lookup raises LoadError, ActiveSupport::Inflector#safe_constantize (and String#safe_constantize) builds a regular expression from the requested constant name without escaping it, so a caller that passes untrusted input lets the attacker choose the source of a pattern that the application compiles. Crafted patterns can trigger defects in Ruby's regular expression compiler, possibly leading to a crash of the server process, and repeated requests could keep the application unavailable. Action Cable passes the channel value of each subscribe command to safe_constantize before any channel lookup, so an unauthenticated client can reach this code when the application mounts Action Cable and accepts connections from untrusted clients without an added authentication check. This issue is fixed in versions 8.1.4.1 and 8.0.5.2.","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":"Active Support: Possible DoS vulnerability in Active Support safe_constantize","id":"CVE-2026-126080","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":null,"products":[],"type":null,"year":"2026"},"n_packages":2,"n_references":5,"next":{"headline":"Action Pack: Possible Strong Parameters bypass in Parameters#each_key","id":"CVE-2026-126081"},"nickname":null,"packages":[{"ecosystem":"RubyGems","fixed":["8.0.5.2"],"introduced":["0"],"last_affected":[],"package":"activesupport","purl":null,"source":"GHSA-8474-xrp6-wh69"},{"ecosystem":"RubyGems","fixed":["8.1.4.1"],"introduced":["8.1.0.beta1"],"last_affected":[],"package":"activesupport","purl":null,"source":"GHSA-8474-xrp6-wh69"}],"prev":{"headline":"Action View: Possible XSS vulnerability in Action View text helpers","id":"CVE-2026-126079"},"products":["rails"],"published":"2026-11-10","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":"CWE Terms of Use","name":"CWE (MITRE)"},{"class":"attribution","licence":"FIRST CVSS licence","name":"CVSS (FIRST)"}],"ssvc":{"automatable":"yes","exploitation":"none","technical_impact":"partial"},"state":"PUBLISHED","updated":"2026-11-12","vendors":["rails"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-126080/"}