{"answers":{"affected":"2 open source packages ship an affected version, including activestorage.","exploited":"There is no known exploitation of CVE-2026-126085 in the wild and no public exploit code.","exposure":"","fix":"Upgrade activestorage to a fixed version for your release line: 8.0.5.2 or 8.1.4.1.","what":"CVE-2026-126085 is a medium-severity vulnerability in rails, published on 10 Nov 2026."},"fix_prompt":"Check this codebase for CVE-2026-126085 and fix it if it is affected.\n\nWhat it is: CVE-2026-126085 is a medium-severity vulnerability in rails, published on 10 Nov 2026. \nExploitation: There is no known exploitation of CVE-2026-126085 in the wild and no public exploit code.\n\nAffected packages and fixed versions:\n- activestorage (RubyGems): affected all versions; fixed in 8.0.5.2\n- activestorage (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-2026-126085/ (Markdown: https://insights.sbomify.com/CVE-2026-126085/index.md)","id":"CVE-2026-126085","markdown":"https://insights.sbomify.com/CVE-2026-126085/index.md","name":"CVE-2026-126085","record":{"aliases":["DEBIAN-CVE-2026-126085","GHSA-hfr4-8rjc-97m2","UBUNTU-CVE-2026-126085"],"analysis":null,"analysis_generated_by":null,"assigner":"GitHub_M","cpe":[],"cvss":{"score":5.3,"severity":"medium","source":"cna","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:N","version":"3.1"},"cwes":[{"id":"CWE-602","name":"Client-Side Enforcement of Server-Side Security"}],"description":"Active Storage makes it simple to upload and reference files in cloud services and attach those files to Active Record objects. Prior to 8.1.4.1 and 8.0.5.2, ActiveStorage::Service::GCSService#url_for_direct_upload does not bind the declared content length into the signed direct-upload URL, and #headers_for_direct_upload returns no length constraint, so the URL authorizes an upload body of any size. A direct-upload client could store a file larger than the byte_size it declared, and the resulting blob keeps the declared size, possibly bypassing application file size validations and quotas. This is the weakness that CVE-2020-8162 fixed in the S3 service. Applications that store files in Google Cloud Storage and accept direct uploads are affected. 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 Storage: Possible circumvention of file size limits in Active Storage direct uploads to Google Cloud Storage","id":"CVE-2026-126085","indexable":true,"kev":null,"kind":"cve","links":{"ecosystem":"RubyGems","product":null,"products":[],"type":null,"year":"2026"},"n_packages":2,"n_references":5,"next":{"headline":"Untrusted search path in the cross-user process launcher in Open Job Description (OpenJD) Sessions for Python before 0.11.0, as used in the","id":"CVE-2026-126087"},"nickname":null,"packages":[{"ecosystem":"RubyGems","fixed":["8.0.5.2"],"introduced":["0"],"last_affected":[],"package":"activestorage","purl":null,"source":"GHSA-hfr4-8rjc-97m2"},{"ecosystem":"RubyGems","fixed":["8.1.4.1"],"introduced":["8.1.0.beta1"],"last_affected":[],"package":"activestorage","purl":null,"source":"GHSA-hfr4-8rjc-97m2"}],"prev":{"headline":"Active Storage: Unsigned Content-Type in Active Storage GCS direct uploads with cache_control","id":"CVE-2026-126084"},"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":null,"exploitation":null,"technical_impact":null},"state":"PUBLISHED","updated":"2026-11-10","vendors":["rails"]},"summary":null,"url":"https://insights.sbomify.com/CVE-2026-126085/"}