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IPv6 clients controlling a typical /64 allocation could rotate through 2^64 distinct source addresses without exhausting the per-address counter, defeating rate limiting on /sign-in/email, /sign-up/email, /forget-password, and every other path the limiter protects. The same bug allowed a single client to vary the textual encoding of one IPv6 address (uppercase, compression, IPv4-mapped, hex-encoded IPv4-in-IPv6) and produce multiple distinct keys. This vulnerability is fixed in 1.4.17 and 1.5.0-beta.9.","references":[{"reference_url":"https://api.first.org/data/v1/epss?cve=CVE-2026-45364","reference_id":"","reference_type":"","scores":[{"value":"0.00083","scoring_system":"epss","scoring_elements":"0.24258","published_at":"2026-06-11T12:55:00Z"}],"url":"https://api.first.org/data/v1/epss?cve=CVE-2026-45364"},{"reference_url":"https://github.com/better-auth/better-auth","reference_id":"","reference_type":"","scores":[{"value":"7.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://github.com/better-auth/better-auth"},{"reference_url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45364","reference_id":"","reference_type":"","scores":[{"value":"7.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""}],"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-45364"},{"reference_url":"https://github.com/better-auth/better-auth/commit/43e719bcc0c223c7079fa0c611a9cf7ea1188254","reference_id":"43e719bcc0c223c7079fa0c611a9cf7ea1188254","reference_type":"","scores":[{"value":"7.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-29T19:05:14Z/"}],"url":"https://github.com/better-auth/better-auth/commit/43e719bcc0c223c7079fa0c611a9cf7ea1188254"},{"reference_url":"https://github.com/better-auth/better-auth/commit/57af0f7b910dcf7b1a5c0615d10b9bd56bb69bef","reference_id":"57af0f7b910dcf7b1a5c0615d10b9bd56bb69bef","reference_type":"","scores":[{"value":"7.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-29T19:05:14Z/"}],"url":"https://github.com/better-auth/better-auth/commit/57af0f7b910dcf7b1a5c0615d10b9bd56bb69bef"},{"reference_url":"https://github.com/better-auth/better-auth/pull/7470","reference_id":"7470","reference_type":"","scores":[{"value":"7.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-29T19:05:14Z/"}],"url":"https://github.com/better-auth/better-auth/pull/7470"},{"reference_url":"https://github.com/better-auth/better-auth/pull/7509","reference_id":"7509","reference_type":"","scores":[{"value":"7.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-29T19:05:14Z/"}],"url":"https://github.com/better-auth/better-auth/pull/7509"},{"reference_url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-p6v2-xcpg-h6xw","reference_id":"GHSA-p6v2-xcpg-h6xw","reference_type":"","scores":[{"value":"7.3","scoring_system":"cvssv3.1","scoring_elements":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"},{"value":"HIGH","scoring_system":"generic_textual","scoring_elements":""},{"value":"Track","scoring_system":"ssvc","scoring_elements":"SSVCv2/E:N/A:Y/T:P/P:M/B:A/M:M/D:T/2026-05-29T19:05:14Z/"}],"url":"https://github.com/better-auth/better-auth/security/advisories/GHSA-p6v2-xcpg-h6xw"}],"fixed_packages":[{"url":"http://public2.vulnerablecode.io/api/packages/375773?format=json","purl":"pkg:npm/better-auth@1.4.17","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/better-auth@1.4.17"},{"url":"http://public2.vulnerablecode.io/api/packages/375774?format=json","purl":"pkg:npm/better-auth@1.5.0-beta.9","is_vulnerable":false,"affected_by_vulnerabilities":[],"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/better-auth@1.5.0-beta.9"}],"aliases":["CVE-2026-45364","GHSA-p6v2-xcpg-h6xw"],"risk_score":null,"exploitability":null,"weighted_severity":null,"resource_url":"http://public2.vulnerablecode.io/vulnerabilities/VCID-k4mt-mvkc-27hn"}],"risk_score":null,"resource_url":"http://public2.vulnerablecode.io/packages/pkg:npm/better-auth@1.5.0-beta.9"}