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{"configurations": [{"nodes": [{"cpeMatch": [{"criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*", "matchCriteriaId": "AD5DE7DE-3A8B-4064-A7D5-1E117A101E81", "versionEndExcluding": "2.2.23", "vulnerable": true}, {"criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*", "matchCriteriaId": "6948AAA6-873D-46BA-AA22-4C81138128E1", "versionEndExcluding": "3.1.21", "versionStartIncluding": "3.0.0", "vulnerable": true}, {"criteria": "cpe:2.3:a:rack:rack:*:*:*:*:*:ruby:*:*", "matchCriteriaId": "3FB592AD-E826-49BE-AC6D-E5F55FDCC96E", "versionEndExcluding": "3.2.6", "versionStartIncluding": "3.2.0", "vulnerable": true}], "negate": false, "operator": "OR"}]}], "cveTags": [], "descriptions": [{"lang": "en", "value": "Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Sendfile#map_accel_path interpolates the value of the X-Accel-Mapping request header directly into a regular expression when rewriting file paths for X-Accel-Redirect. Because the header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex metacharacters and control the generated X-Accel-Redirect response header. In deployments using Rack::Sendfile with x-accel-redirect, this can allow an attacker to cause nginx to serve unintended files from configured internal locations. This issue has been patched in versions 2.2.23, 3.1.21, and 3.2.6."}], "id": "CVE-2026-34830", "lastModified": "2026-04-16T16:50:50.290", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "HIGH", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 5.9, "baseSeverity": "MEDIUM", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 2.2, "impactScore": 3.6, "source": "security-advisories@github.com", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "nvd@nist.gov", "type": "Primary"}]}, "published": "2026-04-02T17:16:26.267", "references": [{"source": "security-advisories@github.com", "tags": ["Vendor Advisory"], "url": "https://github.com/rack/rack/security/advisories/GHSA-qv7j-4883-hwh7"}], "sourceIdentifier": "security-advisories@github.com", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-625"}], "source": "security-advisories@github.com", "type": "Primary"}]}

{"bugzilla": {"description": "rack: Rack: Information disclosure via regular expression injection in X-Accel-Mapping header", "id": "2454510", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2454510"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.9", "cvss3_scoring_vector": "CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:H/I:N/A:N", "status": "draft"}, "cwe": "CWE-625", "details": ["Rack is a modular Ruby web server interface. Prior to versions 2.2.23, 3.1.21, and 3.2.6, Rack::Sendfile#map_accel_path interpolates the value of the X-Accel-Mapping request header directly into a regular expression when rewriting file paths for X-Accel-Redirect. Because the header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex metacharacters and control the generated X-Accel-Redirect response header. In deployments using Rack::Sendfile with x-accel-redirect, this can allow an attacker to cause nginx to serve unintended files from configured internal locations. 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 can exploit this vulnerability by injecting regular expression metacharacters into the X-Accel-Mapping request header. This improper input validation in Rack::Sendfile#map_accel_path allows the attacker to control the generated X-Accel-Redirect response header. Consequently, in deployments using Rack::Sendfile with x-accel-redirect, this can cause nginx to serve unintended files from configured internal locations, leading to information disclosure."], "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-2026-34830", "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": 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"cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "rhel9/ruby-33", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "ubi9/ruby-30", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "ubi9/ruby-33", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-04-02T16:47:40Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-34830\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-34830\nhttps://github.com/rack/rack/security/advisories/GHSA-qv7j-4883-hwh7"], "threat_severity": "Moderate"}

{"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": "2026-04-02T22:34:57.806552+00:00", "value": {"mitigation_remediation": ["Upgrade Rack to version 2.2.23 or later, 3.1.21 or later, or 3.2.6 or later to remove the vulnerability."], "summary": {"action": "Immediate Patch", "impact": "Arbitrary File Read"}, "threat_synthesis": {"affected_systems": "The affected component is Rack, the Ruby web server interface library. The vulnerability affects all releases of Rack older than 2.2.23, 3.1.21, and 3.2.6. These versions are widely used in Ruby applications that rely on Rack::Sendfile with nginx's X-Accel-Redirect feature.", "description_and_impact": "Rack is a modular Ruby web server interface. In versions prior to 2.2.23, 3.1.21, and 3.2.6, the Rack::Sendfile#map_accel_path method interpolates the value of the X-Accel-Mapping request header directly into a regular expression used for rewriting file paths for X-Accel-Redirect. Because this header value is not escaped, an attacker who can supply X-Accel-Mapping to the backend can inject regex metacharacters and control the generated X-Accel-Redirect response header, leading to arbitrary file reads from internal locations, a pattern consistent with CWE-625.", "risk_and_exploitability": "The CVSS score for this issue is 5.9, indicating moderate severity. EPSS data is not provided, and the vulnerability is not listed in CISA\u2019s KEV catalog. The most likely attack vector is a crafted HTTP request containing a malicious X-Accel-Mapping header sent to a Rack application sitting behind nginx configured for X-Accel-Redirect. If exploited, the attacker could cause nginx to serve unintended files from configured internal locations, potentially exposing sensitive data. Because the attack requires only the ability to supply request headers, it can be performed over the public network, but it is mitigated by the patch."}}}}, "created": "2026-04-03T07:32:31.022335+00:00", "updated": "2026-04-03T09:18:22.143846+00:00", "vendors": ["rack", "rack$PRODUCT$rack"]}