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{"bugzilla": {"description": "rack: Rack: Information disclosure via regular expression metacharacters in root path", "id": "2454498", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454498"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.3", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:N", "status": "draft"}, "cwe": "CWE-41", "details": ["Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Directory interpolates the configured root path directly into a regular expression when deriving the displayed directory path. If root contains regex metacharacters such as +, *, or ., the prefix stripping can fail and the generated directory listing may expose the full filesystem path in the HTML output. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6.", "A flaw was found in Rack. A remote attacker could exploit a vulnerability in Rack::Directory's handling of root paths. When the configured root path contains special regular expression characters, the directory listing generation can fail to properly strip the path prefix. This can lead to the exposure of the full filesystem path in the HTML output, potentially revealing sensitive system information."], "mitigation": {"lang": "en:us", "value": "Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base or stability."}, "name": "CVE-2026-34763", "package_state": [{"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Fix deferred", "package_name": "openshift-logging/cluster-logging-operator-bundle", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Fix deferred", "package_name": "openshift-logging/cluster-logging-rhel9-operator", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Fix deferred", "package_name": "openshift-logging/eventrouter-rhel9", "product_name": "Logging Subsystem for 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"cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp22/zync", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp24/backend", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp24/system", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp24/zync", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp25/backend", "product_name": "Red Hat 3scale API Management Platform 2"}, {"cpe": "cpe:/a:redhat:red_hat_3scale_amp:2", "fix_state": "Fix deferred", "package_name": "3scale-amp25/system", "product_name": "Red 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{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[0,2.2.23)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.0.0.beta1,3.1.21)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[3.2.0,3.2.6)"}}], "enrichment": {"confidence": 100.0, "confidence_source": "matching", "scores": [{"score": 100.0, "source": "matching"}]}, "original": {"product": "rack", "source": "cna", "vendor": "rack"}, "product": "rack", "vendor": "rack"}], "analysis": {"en": {"generated_at": "2026-04-04T04:23:33.530430+00:00", "value": {"mitigation_remediation": ["Upgrade Rack to version 2.2.23 or newer (this includes 3.1.21 and 3.2.6) to apply the official patch.", "If an upgrade is not immediately feasible, avoid using Rack::Directory with root paths that contain regex metacharacters until the patch can be applied."], "summary": {"action": "Immediate Patch", "impact": "Information Disclosure and Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects all releases of Rack prior to 2.2.23, 3.1.21, and 3.2.6 when the Rack::Directory middleware is used to browse directories. Applications that rely on earlier versions of Rack and configure a root path containing regex metacharacters are susceptible.", "description_and_impact": "Rack::Directory builds a regular expression by interpolating the configured root path. When that path contains regex metacharacters such as +, *, or ., the regex is malformed and prefix stripping fails. The generated directory listing may then expose the full filesystem path in the HTML output, and the malformed regex can trigger a denial\u2011of\u2011service condition by causing unexpected errors. This vulnerability is a form of improper input processing, reflected in the listed weaknesses.", "risk_and_exploitability": "The CVSS score of 5.3 represents moderate severity, while the EPSS score below 1% suggests a low, though present, likelihood of exploitation. The issue is not documented in the KER catalog. An attacker can trigger the flaw through an unauthenticated HTTP request that causes Rack::Directory to process a root path with regex metacharacters, leading to information disclosure and potential service interruption. Evidence of a direct exploitation pathway is implied by the nature of the vulnerability, but no public exploit has been identified."}}}}, "created": "2026-04-03T07:36:06.443878+00:00", "updated": "2026-04-07T07:56:00.612336+00:00", "vendors": ["rack", "rack$PRODUCT$rack"]}