CVE-2026-4923

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This backtracking vulnerability requires the second wildcard to be somewhere other than the end of the path.\nUnsafe examples:\n/*foo-*bar-:baz\n/*a-:b-*c-:d\n/x/*a-:b/*c/y\nSafe examples:\n/*foo-:bar\n/*foo-:bar-*baz\nPatches:\nUpgrade to version 8.4.0.\nWorkarounds:\nIf you are using multiple wildcard parameters, you can check the regex output with a tool such as https://makenowjust-labs.github.io/recheck/playground/ to confirm whether a path is vulnerable.", "A flaw was found in path-to-regexp. This vulnerability allows a remote attacker to cause a Denial of Service (DoS) by sending a specially crafted request. The issue arises when multiple wildcards are used with parameters in a way that creates a vulnerable regular expression, leading to excessive processing time and system unresponsiveness."], "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-2026-4923", "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": "io.cryostat-cryostat", "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"}, 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"package_name": "org.keycloak-keycloak-parent", "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": "2026-03-26T19:02:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-4923\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-4923\nhttps://cna.openjsf.org/security-advisories.html"], "threat_severity": "Moderate"}

{"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": "2026-03-26T20:35:39.165556+00:00", "value": {"mitigation_remediation": ["Apply the vendor patch by upgrading path-to-regexp to version 8.4.0 or later", "If upgrading is not immediately possible, use a regex checking tool such as https://makenowjust-labs.github.io/recheck/playground/ to review generated regexes for paths with multiple wildcards", "Avoid or limit the use of multiple wildcard parameters within routing definitions to prevent construction of vulnerable patterns"], "summary": {"action": "Patch", "impact": "Regular Expression Denial of Service"}, "threat_synthesis": {"affected_systems": "The affected component is the path-to-regexp library, an npm package used for routing in JavaScript applications. All versions before the 8.4.0 release are vulnerable. The library is commonly embedded in web frameworks that build request routing patterns, so any application that includes a vulnerable version of path-to-regexp is at risk.", "description_and_impact": "The vulnerability allows an attacker to trigger a regular expression backtracking condition by crafting a path that contains multiple wildcards together with at least one parameter. The resulting regular expression can consume excessive CPU resources, leading to a denial of service for the application without providing any other direct compromise. The weakness is classified as Date Regular Expression Denial of Service (CWE-1333).", "risk_and_exploitability": "The CVSS score of 5.9 indicates a medium severity impact. No EPSS score is available, and the vulnerability is not listed in the CISA Known Exploited Vulnerabilities catalog, implying no publicly known exploits yet. The likely attack vector is an HTTP request containing a specially crafted URL that triggers the inefficient regular expression during routing. Because the vulnerability only affects internal pattern matching, remediation typically involves updating the dependency or avoiding multiple wildcard parameters in routes."}}}}, "created": "2026-03-27T08:33:17.550295+00:00", "updated": "2026-03-27T09:25:37.750391+00:00", "vendors": ["path-to-regexp", "path-to-regexp$PRODUCT$path-to-regexp"]}