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{"bugzilla": {"description": "path-to-regexp: path-to-regexp: Denial of Service via crafted regular expressions", "id": "2451867", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451867"}, "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": ["Impact:\nA bad regular expression is generated any time you have multiple sequential optional groups (curly brace syntax), such as `{a}{b}{c}:z`. The generated regex grows exponentially with the number of groups, causing denial of service.\nPatches:\nFixed in version 8.4.0.\nWorkarounds:\nLimit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.", "A flaw was found in path-to-regexp. A remote attacker could exploit this vulnerability by providing specially crafted input that generates a regular expression with multiple sequential optional groups. 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"cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-console-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-monitoring-plugin-rhel8", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift:4", "fix_state": "Affected", "package_name": "openshift4/ose-monitoring-plugin-rhel9", "product_name": "Red Hat OpenShift Container Platform 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/mcg-core-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/ocs-client-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/odf-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_data_foundation:4", "fix_state": "Affected", "package_name": "odf4/odf-multicluster-console-rhel9", "product_name": "Red Hat Openshift Data Foundation 4"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/code-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_devspaces:3", "fix_state": "Affected", "package_name": "devspaces/jetbrains-ide-rhel9", "product_name": "Red Hat OpenShift Dev Spaces"}, {"cpe": "cpe:/a:redhat:openshift_distributed_tracing:3", "fix_state": "Affected", "package_name": "rhosdt/tempo-jaeger-query-rhel9", "product_name": "Red Hat OpenShift distributed tracing 3"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Affected", "package_name": "openshift-gitops-1/argocd-rhel8", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Affected", "package_name": "openshift-gitops-1/argocd-rhel9", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:openshift_gitops:1", "fix_state": "Affected", "package_name": "openshift-gitops-1/console-plugin-rhel8", "product_name": "Red Hat OpenShift GitOps"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Not affected", "package_name": "container-native-virtualization/kubevirt-console-plugin", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Affected", "package_name": "container-native-virtualization/kubevirt-console-plugin-rhel9", "product_name": "Red Hat OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_bpms_platform:7", "fix_state": "Affected", "package_name": "org.kie-process-migration-service", "product_name": "Red Hat Process Automation 7"}, {"cpe": "cpe:/a:redhat:jboss_enterprise_bpms_platform:7", "fix_state": "Affected", "package_name": "org.uberfire-uberfire-parent", "product_name": "Red Hat Process Automation 7"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Affected", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "nodejs-react-router", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Affected", "package_name": "nodejs-react-router-dom", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Affected", "package_name": "org.keycloak-keycloak-parent", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Affected", "package_name": "rhtas/rhtas-console-ui-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:2", "fix_state": "Not affected", "package_name": "rhtpa/rhtpa-trustification-service-rhel9", "product_name": "Red Hat Trusted Profile Analyzer"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Affected", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}], "public_date": "2026-03-26T18:59:38Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4926\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4926\nhttps://cna.openjsf.org/security-advisories.html"], "statement": "This is an Important flaw in `path-to-regexp` that can lead to a Denial of Service. The vulnerability occurs when specially crafted input containing multiple sequential optional groups is used to generate regular expressions, causing exponential resource consumption. Red Hat products utilizing `path-to-regexp` that process untrusted input as route patterns may be affected.", "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "semver", "value": "[8.0.0,8.4.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "8.4.0"}}], "enrichment": {"confidence": 100.0, "confidence_source": "cna", "scores": [{"score": 100.0, "source": "cna"}]}, "original": {"product": "path-to-regexp", "source": "cna", "vendor": "path-to-regexp"}, "product": "path-to-regexp", "vendor": "path-to-regexp"}], "analysis": {"en": {"generated_at": "2026-03-26T20:35:51.074535+00:00", "value": {"mitigation_remediation": ["Upgrade the path-to-regexp package to version 8.4.0 or later.", "Reduce the number of sequential optional groups in all route patterns.", "Avoid using user-provided data directly to build route patterns; validate or sanitize input before use.", "Monitor application performance for signs of regex compilation delays or high CPU usage.", "Apply temporary throttling or circuit-breaking mechanisms to mitigate denial of service attacks."], "summary": {"action": "Immediate Patch", "impact": "Denial of Service"}, "threat_synthesis": {"affected_systems": "The vulnerability affects the path-to-regexp package, a JavaScript routing utility used in many web frameworks. Any deployment using a version prior to 8.4.0 is susceptible, especially when route definitions include more than one consecutive optional group. Products that embed path-to-regexp directly or indirectly must verify the version they are running.", "description_and_impact": "A misuse of the regular expression engine in the path-to-regexp library causes a denial of service when route patterns contain multiple sequential optional groups. The algorithm that transforms these patterns into a regular expression expands exponentially as more optional groups are added, which can overload the server with time to compile or match the pattern. This weakness reduces the availability of applications that rely on path-to-regexp for routing.", "risk_and_exploitability": "With a CVSS score of 7.5 the risk is moderate to high. Exploitation requires crafting a route pattern with sequential optional groups, which is feasible if the application author uses dynamic route construction from user input. Attackers can trigger CPU exhaustion by repeatedly accessing such URLs, leading to denial of service. Because the EPSS score is unavailable, the probability cannot be quantified, and the vulnerability is not listed in the CISA KEV catalog, but the severity remains significant for exposed applications."}}}}, "created": "2026-03-27T08:33:19.313377+00:00", "updated": "2026-03-27T09:25:40.044036+00:00", "vendors": ["path-to-regexp", "path-to-regexp$PRODUCT$path-to-regexp"]}