{"id":"CVE-2026-102277","revision":"099cfc8fbe3c4d5f86f5c861c272904f","records":[{"revision":"099cfc8fbe3c4d5f86f5c861c272904f","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-102277","aliases":[],"title":"brace-expansion: Quadratic-time expansion of the `{a},b}` rewrite causes CPU denial of service","description":"The brace-expansion library generates arbitrary strings containing a common prefix and suffix. Prior to 1.1.21, 2.1.7, 3.0.9, and 5.0.12, the expand function handles untrusted {a},b}-shaped patterns with many trailing closing braces by restarting its scan once for each trailing closing brace. The successive full-input rescans with linear working-string growth cause quadratic CPU time and memory pressure that can block the Node.js event loop. The process eventually recovers, making the impact a recoverable CPU denial of service. This issue is fixed in versions 1.1.21, 2.1.7, 3.0.9, and 5.0.12.","state":0,"publishedAt":"2026-09-28T20:54:46.16+00:00","modifiedAt":"2026-09-29T19:38:56.637+00:00","affected":[{"ecosystem":"Vendor product","name":"brace-expansion","ranges":[],"versions":[],"rawVersionEvidence":"{\n                    \"vendor\": \"juliangruber\",\n                    \"product\": \"brace-expansion\",\n                    \"versions\": [\n                        {\n                            \"version\": \">= 4.0.0, < 5.0.12\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 3.0.0, < 3.0.9\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \">= 2.0.0, < 2.1.7\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"< 1.1.21\",\n                            \"status\": \"affected\"\n                        }\n                    ]\n                }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L","score":5.3,"severity":"MEDIUM"}],"references":["https://github.com/juliangruber/brace-expansion/security/advisories/GHSA-q2hr-2g5m-vwhr","https://github.com/juliangruber/brace-expansion/commit/33a5ef17b8d800bbfa8c52b14c39043b6aac1a96","https://github.com/juliangruber/brace-expansion/commit/bdff773f98e5988616b7039cc9b508df5d640b22","https://github.com/juliangruber/brace-expansion/commit/c55e67d8d8b1c56a2474afff15c2891166b2d364","https://github.com/juliangruber/brace-expansion/commit/ffdfa3e3806bed17c0874b8f1439b084de354a7e"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-102277","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-102277","identifiers":["CVE-2026-102277"]},"retained":false,"historicalAffected":[]}],"coverage":[]}