{"id":"CVE-2026-75583","summary":"keeper.sh Calendar version prior to 2.18.14 SSRF Guard Bypass via DNS Rebinding","details":"keeper.sh's calendar module version prior to 2.18.14 contains a server-side request forgery (SSRF) guard bypass vulnerability that allows authenticated attackers to reach private network addresses by exploiting a DNS rebinding attack against the two-phase URL validation and connection flow. The SSRF guard validates a hostname's resolved IP addresses but discards them before the actual HTTP connection is opened, allowing an attacker who controls authoritative DNS to return a public address during validation and a private address during the subsequent independent socket-level DNS resolution, causing the guard to pass while the outbound connection reaches internal infrastructure such as cloud instance metadata endpoints.","aliases":["GHSA-mxxg-qffg-j3p6"],"modified":"2026-08-22T03:31:08.978204438Z","published":"2026-08-19T16:35:53.999Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75583.json","cna_assigner":"VulnCheck","cwe_ids":["CWE-918"]},"references":[{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/75xxx/CVE-2026-75583.json"},{"type":"ADVISORY","url":"https://github.com/ridafkih/keeper.sh/security/advisories/GHSA-mxxg-qffg-j3p6"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-75583"},{"type":"ADVISORY","url":"https://www.vulncheck.com/advisories/keeper-sh-calendar-version-prior-to-ssrf-guard-bypass-via-dns-rebinding"},{"type":"FIX","url":"https://github.com/ridafkih/keeper.sh/commit/aea1cf537b850509e802b388f38cf1482cb6291b"},{"type":"PACKAGE","url":"https://github.com/ridafkih/keeper.sh"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://github.com/ridafkih/keeper.sh","events":[{"introduced":"0"},{"fixed":"aea1cf537b850509e802b388f38cf1482cb6291b"}],"database_specific":{"source":["AFFECTED_FIELD","REFERENCES"],"extracted_events":[{"introduced":"0"},{"fixed":"2.18.14"}]}}],"versions":["v2.18.13","v2.18.12","v2.18.11","v2.18.10","v2.18.9","v2.18.8","v2.18.7","v2.18.6","v2.18.5","v2.18.4","v2.18.3","v2.18.2","v2.18.1","v2.18.0","v2.17.0","v2.16.0","v2.15.1","v2.15.0","v2.14.12","v2.14.11","v2.14.10","v2.14.9","v2.14.8","v2.14.7","v2.14.6","v2.14.5","v2.14.4","v2.14.3","v2.14.2","v2.14.1","v2.14.0","v2.13.8","v2.13.7","v2.13.6","v2.13.5","v2.13.4","v2.13.3","v2.13.2","v2.13.1","v2.13.0","v2.12.2","v.2.12.2","v2.12.1","v2.12.0","v2.11.7","v2.11.6","v2.11.5","v2.11.4","v2.11.3","v2.11.2","v2.11.1","v2.11.0","v2.10.4","v2.10.3","v2.10.2","v2.10.1","v2.10.0","v2.9.36","v2.9.35","v2.9.34","v2.9.33","v2.9.32","v2.9.31","2.9.31","v2.9.30","v2.9.29","v2.9.28","v2.9.27","v2.9.26","v2.9.25","v2.9.24","v2.9.23","v2.9.22","v2.9.21","v2.9.20","v2.9.18","v2.9.17","v2.9.16","v2.9.15","v2.9.14","v2.9.13","v2.9.12","v2.9.11","v2.9.10","v2.9.9","v2.9.8","v2.9.7","v2.9.6","v2.9.5","v2.9.4","v2.9.3","v2.9.2","v2.9.1","v2.9.0","v2.8.12","v2.8.11","v2.8.10","v2.8.9","v2.8.8","v2.8.7","2.8.7","v2.8.6","v2.8.5","v2.8.4","v2.8.3","v2.8.2","v2.8.1","v2.8.0","v2.7.1","v2.7.0","v2.6.1","v2.6.0","v2.5.12","v2.5.11","v2.5.9","v2.5.10","v2.5.8","v2.5.7","v2.5.6","v2.5.5","v2.5.4","v2.5.3","v2.5.2","v2.5.1","v2.5.0","v2.4.7","v2.4.6","v2.4.5","v2.4.4","v2.4.3","v2.4.2","v2.4.1","v2.4.0","v2.3.1","v2.3.0","v2.2.20","v2.2.19","v2.2.18","v2.2.17","v2.2.16","v2.2.15","v2.2.14","v2.2.13","v2.2.12","v2.2.11","v2.2.10","v2.2.9","v2.2.8","v2.2.7","v2.2.6","v2.2.5","v2.2.4","v2.2.3","v2.2.2","v2.2.1","v2.2.0","v2.1.14","v2.1.13","v2.1.12","v2.1.11","v2.1.10","v2.1.9","v2.1.8","v2.1.7","v2.1.6","v2.1.5","v2.1.4","v2.1.3","v2.1.2","v2.1.1","v2.1.0","v2.0.1","v2.0.0","v1.11.6","v1.11.5","v1.11.4","v1.11.2","v1.11.1","v1.11.0","v1.11.0-beta.2","v1.10.9","v1.10.8","v1.10.7","v1.10.6","v1.10.5","v1.10.4","v1.10.3","v1.10.2","v1.10.1","v1.10.0","v1.9.0","v1.8.5","v1.8.4","v1.8.3","v1.8.2","v1.8.1","v1.8.0","v1.7.2","v1.7.1","v1.7.0","v1.6.1","v1.6.1-beta.1","v1.6.0","v1.5.3","v1.5.2","v1.5.1","v1.5.0","v1.5.0-beta.2","v1.5.0-beta.1","v1.4.2","v1.4.1","v1.4.0","v1.3.1-beta.1","v1.3.0","v1.2.12","v1.2.11","v1.2.10","v1.2.9","v1.2.8","v1.2.7","v1.2.6","v1.2.5","v1.2.4","v1.2.3","v1.2.2","v1.2.1","v1.2.0","v1.1.6","v1.1.5","v1.1.4"],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-75583.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V4","score":"CVSS:4.0/AV:N/AC:H/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:L/SI:N/SA:N"}]}