{"url":"http://public2.vulnerablecode.io/api/vulnerabilities/73727?format=json","vulnerability_id":"VCID-nmfc-rcv8-gyb8","summary":"Impact:\n\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.\n\nPatches:\n\nFixed in version 8.4.0.\n\nWorkarounds:\n\nLimit the number of sequential optional groups in route patterns. Avoid passing user-controlled input as route patterns.","aliases":[{"alias":"CVE-2026-4926"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/96652?format=json","purl":"pkg:deb/debian/node-path-to-regexp@8.4.0-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-path-to-regexp@8.4.0-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/96648?format=json","purl":"pkg:deb/debian/node-path-to-regexp@8.4.2-1?distro=trixie","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-path-to-regexp@8.4.2-1%3Fdistro=trixie"}],"affected_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/96646?format=json","purl":"pkg:deb/debian/node-path-to-regexp@6.2.0-1?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-cgsq-eu5m-1qfy"},{"vulnerability":"VCID-csfk-swqf-8fe6"},{"vulnerability":"VCID-nmfc-rcv8-gyb8"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-path-to-regexp@6.2.0-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/96647?format=json","purl":"pkg:deb/debian/node-path-to-regexp@6.2.1-1?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-cgsq-eu5m-1qfy"},{"vulnerability":"VCID-csfk-swqf-8fe6"},{"vulnerability":"VCID-nmfc-rcv8-gyb8"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-path-to-regexp@6.2.1-1%3Fdistro=trixie"},{"url":"http://public2.vulnerablecode.io/api/packages/96649?format=json","purl":"pkg:deb/debian/node-path-to-regexp@6.3.0-1?distro=trixie","is_vulnerable":true,"affected_by_vulnerabilities":[{"vulnerability":"VCID-cgsq-eu5m-1qfy"},{"vulnerability":"VCID-nmfc-rcv8-gyb8"}],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:deb/debian/node-path-to-regexp@6.3.0-1%3Fdistro=trixie"}],"references":[{"reference_url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-4926","reference_id":"","reference_type":"","scores":[],"url":"https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2026-4926"},{"reference_url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1132020","reference_id":"1132020","reference_type":"","scores":[],"url":"https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=1132020"},{"reference_url":"https://cna.openjsf.org/security-advisories.html","reference_id":"security-advisories.html","reference_type":"","scores":[{"value":"7.5","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-03-27T19:44:44Z/"}],"url":"https://cna.openjsf.org/security-advisories.html"}],"weaknesses":[{"cwe_id":400,"name":"Uncontrolled Resource Consumption","description":"The product does not properly control the allocation and maintenance of a limited resource, thereby enabling an actor to influence the amount of resources consumed, eventually leading to the exhaustion of available resources."},{"cwe_id":1333,"name":"Inefficient Regular Expression Complexity","description":"The product uses a regular expression with an inefficient, possibly exponential worst-case computational complexity that consumes excessive CPU cycles."}],"exploits":[],"severity_range_score":"7.5 - 7.5","exploitability":null,"weighted_severity":null,"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-nmfc-rcv8-gyb8"}