CVE-2026-4867

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{"bugzilla": {"description": "path-to-regexp: path-to-regexp: Denial of Service via catastrophic backtracking from malformed URL parameters", "id": "2451783", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2451783"}, "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:N/I:N/A:L", "status": "draft"}, "cwe": "CWE-1333", "details": ["A flaw was found in path-to-regexp. A remote attacker could exploit this vulnerability by crafting a malicious URL with three or more parameters in a single segment, separated by non-period characters. This causes the component to generate a bad regular expression, leading to catastrophic backtracking. The overlapping capture groups can consume excessive processing resources, resulting in a Denial of Service (DoS) for the affected application."], "mitigation": {"lang": "en:us", "value": "To mitigate this issue, applications using `path-to-regexp` can implement custom regular expressions for parameters beyond the first in a single URL segment. For example, a route like `/:a-:b-:c` can be rewritten as `/:a-:b([^-/]+)-:c([^-/]+)`. Alternatively, limiting the maximum length of incoming URLs can also reduce the risk of exploitation. These changes require application-level configuration and may necessitate a service restart to take effect."}, "name": "CVE-2026-4867", "package_state": [{"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Fix deferred", "package_name": "cryostat/cryostat-openshift-console-plugin-rhel9", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:cryostat:4", "fix_state": "Fix deferred", "package_name": "path-to-regexp", "product_name": "Cryostat 4"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Fix deferred", "package_name": "openshift-logging/elasticsearch6-rhel9", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Fix deferred", "package_name": "openshift-logging/elasticsearch-operator-bundle", "product_name": "Logging Subsystem for Red Hat OpenShift"}, {"cpe": "cpe:/a:redhat:logging:5", "fix_state": "Fix deferred", "package_name": "openshift-logging/elasticsearch-proxy-rhel9", "product_name": "Logging Subsystem for Red Hat 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OpenShift Virtualization 4"}, {"cpe": "cpe:/a:redhat:container_native_virtualization:4", "fix_state": "Fix deferred", "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": "Fix deferred", "package_name": "path-to-regexp", "product_name": "Red Hat Process Automation 7"}, {"cpe": "cpe:/a:redhat:quay:3", "fix_state": "Fix deferred", "package_name": "quay/quay-rhel8", "product_name": "Red Hat Quay 3"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "nodejs-react-router", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:satellite:6", "fix_state": "Fix deferred", "package_name": "nodejs-react-router-dom", "product_name": "Red Hat Satellite 6"}, {"cpe": "cpe:/a:redhat:red_hat_single_sign_on:7", "fix_state": "Fix deferred", "package_name": "path-to-regexp", "product_name": "Red Hat Single Sign-On 7"}, {"cpe": "cpe:/a:redhat:trusted_artifact_signer:1", "fix_state": "Fix deferred", "package_name": "rhtas/rhtas-console-ui-rhel9", "product_name": "Red Hat Trusted Artifact Signer"}, {"cpe": "cpe:/a:redhat:trusted_profile_analyzer:2", "fix_state": "Fix deferred", "package_name": "rhtpa/rhtpa-trustification-service-rhel9", "product_name": "Red Hat Trusted Profile Analyzer"}, {"cpe": "cpe:/a:redhat:ansible_portal:2", "fix_state": "Fix deferred", "package_name": "ansible-automation-platform/automation-portal", "product_name": "Self-service automation portal 2"}], "public_date": "2026-03-26T16:16:25Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4867\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4867\nhttps://blakeembrey.com/posts/2024-09-web-redos\nhttps://cna.openjsf.org/security-advisories.html\nhttps://github.com/advisories/GHSA-9wv6-86v2-598j"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[0,0.1.13)"}}], "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": "2026-03-26T17:52:04.609202+00:00", "value": {"mitigation_remediation": ["Upgrade the path-to-regexp package to version 0.1.13 or later", "Modify any route definitions that use three or more dynamic parameters in a single segment to include explicit regex patterns for subsequent parameters (e.g., :b([^-/]+))", "If rewriting routes is not possible, limit the maximum allowed URL length to prevent excessively long request paths"], "summary": {"action": "Immediate Patch", "impact": "Regular Expression Denial of Service"}, "threat_synthesis": {"affected_systems": "The affected library is the path-to-regexp npm package. Versions up to and including 0.1.12 generate the problematic regular expression. Applications that import this package and use route patterns with three or more dynamic parameters in a single segment\u2014without custom regex overrides\u2014are at risk.\n", "description_and_impact": "The path-to-regexp library constructs a regular expression that becomes vulnerable when three or more dynamic parameters are present in a single path segment separated by non\u2011dot characters. In such cases, the generated lookahead does not block single separator characters, causing capture groups to overlap and trigger catastrophic backtracking during URL matching. An attacker can exploit this by sending a request URL containing many characters, leading the server to expend excessive CPU resources and become unresponsive, thereby impacting application availability.\n", "risk_and_exploitability": "The CVSS score of 7.5 classifies this issue as high severity, indicating significant potential for service disruption. The EPSS score is not provided, so the likelihood of exploitation is uncertain, yet the attack does not require special privileges; any user able to craft a request can trigger the denial of service. This vulnerability is not listed in the CISA KEV catalog. Adopting the fix or a mitigating workaround quickly reduces the risk to application availability."}}}}, "created": "2026-03-27T08:34:01.347116+00:00", "updated": "2026-03-27T09:26:27.985344+00:00", "vendors": ["path-to-regexp", "path-to-regexp$PRODUCT$path-to-regexp"]}