CVE-2026-126080

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{}

{"affected": [{"affectedData": [{"product": "rails", "vendor": "rails", "versions": [{"status": "affected", "version": ">= 8.1, < 8.1.4.1"}, {"status": "affected", "version": "< 8.0.5.2"}]}], "source": "security-advisories@github.com"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "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."}], "id": "CVE-2026-126080", "lastModified": "2026-11-12T22:09:39.233", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-126080", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-11-12T19:08:45.685836Z", "version": "2.0.3"}}]}, "published": "2026-11-10T21:19:26.663", "references": [{"source": "security-advisories@github.com", "url": "https://github.com/rails/rails/commit/210ac22d446c8e2625b091e79256806b836eee20"}, {"source": "security-advisories@github.com", "url": "https://github.com/rails/rails/commit/95aa9e416016524956d4904fed96eaed079580bb"}, {"source": "security-advisories@github.com", "url": "https://github.com/rails/rails/releases/tag/v8.0.5.2"}, {"source": "security-advisories@github.com", "url": "https://github.com/rails/rails/releases/tag/v8.1.4.1"}, {"source": "security-advisories@github.com", "url": "https://github.com/rails/rails/security/advisories/GHSA-8474-xrp6-wh69"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Awaiting Analysis", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-74"}], "source": "security-advisories@github.com", "type": "Secondary"}]}

{"bugzilla": {"description": "activesupport: Active Support: Denial of Service via unescaped regular expressions in safe_constantize", "id": "2571285", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2571285"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.5", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in Active Support. An unauthenticated remote attacker can cause a Denial of Service (DoS) by submitting crafted input that is handled during constant lookup, such as through channel subscription requests. Because untrusted constant names are compiled into regular expressions without proper sanitization, specially constructed input can crash the underlying server process and render the application unavailable."], "mitigation": {"lang": "en:us", "value": "For applications that do not require Action Cable functionality, disable the endpoint by setting the mount path to nil in the application configuration:\nconfig.action_cable.mount_path = nil\nFor applications requiring Action Cable, enforce authentication by rejecting unauthorized connections in the connection handler:\n# In app/channels/application_cable/connection.rb\nmodule ApplicationCable\nclass Connection < ActionCable::Connection::Base\ndef connect\nreject_unauthorized_connection unless current_user\nend\nend\nend\nCaveats: Disabling the mount path disables all Action Cable WebSocket endpoints. Enforcing authentication limits exposure to verified users only and does not eliminate risk from untrusted authenticated users.\nWarning: Modifying application configuration or channel connection files requires restarting the application service to take effect."}, "name": "CVE-2026-126080", "package_state": [{"cpe": "cpe:/a:redhat:3scale:2.13", "fix_state": "Affected", "package_name": "3scale-amp2/backend-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:3scale:2.13", "fix_state": "Affected", "package_name": "3scale-amp2/system-rhel8", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:3scale:2.13", "fix_state": "Affected", "package_name": "3scale-amp2/system-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:3scale:2.13", "fix_state": "Affected", "package_name": "3scale-amp2/toolbox-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:3scale:2.13", "fix_state": "Affected", "package_name": "3scale-amp2/zync-rhel9", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "ruby", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-11-10T21:04:44Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-126080\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-126080\nhttps://github.com/rails/rails/commit/210ac22d446c8e2625b091e79256806b836eee20\nhttps://github.com/rails/rails/commit/95aa9e416016524956d4904fed96eaed079580bb\nhttps://github.com/rails/rails/releases/tag/v8.0.5.2\nhttps://github.com/rails/rails/releases/tag/v8.1.4.1\nhttps://github.com/rails/rails/security/advisories/GHSA-8474-xrp6-wh69"], "statement": "This vulnerability is rated as Important because an unauthenticated remote attacker can crash the application server by providing malicious channel subscription parameters to exposed Action Cable endpoints, causing a persistent denial of service. The impact primarily threatens availability in deployments that permit unauthenticated connections to Action Cable endpoints. Services that disable Action Cable or enforce strict user verification prior to channel subscription face significantly reduced exposure.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[8.1,8.1.4.1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,8.0.5.2)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "rails", "source": "cna", "vendor": "rails"}, "product": "rails", "vendor": "rails"}], "created": "2026-11-12T01:00:09.863737+00:00", "updated": "2026-11-13T11:30:07.805069+00:00", "vendors": ["rails", "rails$PRODUCT$rails"]}