{"cve":"CVE-2026-70666","nvd":{"published":"2026-08-18T20:17:23.237","modified":"2026-10-22T22:10:00.250","status":"Deferred","description":"Lemur manages TLS certificate creation. Prior to 1.9.3, an authority-role member could update acme_url through PUT /api/1/authorities/ without revalidation and direct setup_acme_client_no_retry to an attacker-controlled ACME server. ACME directory and order responses contain newNonce, newOrder, authorizations, and finalize URLs chosen by that server. The Lemur ClientV2 followed those URLs without requiring their host to match the configured directory host, allowing JWS-signed requests to internal services or cloud metadata endpoints. The issue required an ACME authority and a user authorized for that authority, but did not require global administrator privileges. The fix revalidates updates and introduces _PinnedClientNetwork to enforce a single allowed host for the complete ACME flow. This issue is fixed in version 1.9.3.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:C/C:L/I:L/A:L","score":7.4},"cwes":["CWE-918"],"references":["https://github.com/Netflix/lemur/commit/6dcb19b6d6004e97796d6a0344b130b2ba57f050","https://github.com/Netflix/lemur/releases/tag/v1.9.3","https://github.com/Netflix/lemur/security/advisories/GHSA-xpmj-wjcp-6pww"],"products":[],"source":"nvd","synced_at":"2026-10-23T16:39:26.291718493+00:00"},"epss":{"cve":"CVE-2026-70666","score":0.00216,"percentile":0.11919,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-xpmj-wjcp-6pww","url":"https://osv.dev/vulnerability/GHSA-xpmj-wjcp-6pww","summary":"Lemur: Server-Side Request Forgery via the ACME client following server-controlled URLs","modified":"2026-08-19T12:55:40.814934801Z","packages":[{"ecosystem":"PyPI","name":"lemur","purl":"pkg:pypi/lemur","ranges":["<1.9.3"],"fixed":["1.9.3"]}]},{"id":"PYSEC-2026-3680","url":"https://osv.dev/vulnerability/PYSEC-2026-3680","summary":"Lemur: Server-Side Request Forgery via the ACME client following server-controlled URLs","modified":"2026-08-19T12:45:08.258250622Z","packages":[{"ecosystem":"PyPI","name":"lemur","purl":"pkg:pypi/lemur","ranges":["<1.9.3"],"fixed":["1.9.3"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}