{"cve":"CVE-2026-55162","nvd":{"published":"2026-08-18T19:16:58.217","modified":"2026-10-22T22:10:00.250","status":"Deferred","description":"Lemur manages TLS certificate creation. Prior to 1.9.2, lemur/certificates/verify.py accepted CRL Distribution Point and OCSP responder URLs from uploaded certificate extensions and used them in crl_verify and ocsp_verify without adequate destination validation. An authenticated operator could submit a certificate through POST /api/1/certificates/upload and cause verify_string to reach loopback, RFC1918, link-local, or instance-metadata destinations such as 169.254.169.254. The requests could probe internal services and create side effects from the Lemur host network position. The CRL path also used an unbounded cache, allowing attacker-controlled entries to persist and consume memory. The fix validates destinations, supports explicit trusted-host allowlists, and bounds the CRL cache. This issue is fixed in version 1.9.2.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:L","score":6.3},"cwes":["CWE-918"],"references":["https://github.com/Netflix/lemur/commit/733714a2b00b2f72c3d460e440770e46a3ea9d6a","https://github.com/Netflix/lemur/releases/tag/v1.9.2","https://github.com/Netflix/lemur/security/advisories/GHSA-54vg-pfh7-jq95","https://github.com/Netflix/lemur/security/advisories/GHSA-54vg-pfh7-jq95"],"products":[],"source":"nvd","synced_at":"2026-10-23T16:39:26.291718493+00:00"},"epss":{"cve":"CVE-2026-55162","score":0.00216,"percentile":0.11919,"date":"2026-10-25"},"kev":null,"osv":[{"id":"GHSA-54vg-pfh7-jq95","url":"https://osv.dev/vulnerability/GHSA-54vg-pfh7-jq95","summary":"Lemur: Crafted CRL/OCSP URLs in uploaded certificates lead to post-authentication SSRF","modified":"2026-08-20T04:05:00.546161932Z","packages":[{"ecosystem":"PyPI","name":"lemur","purl":"pkg:pypi/lemur","ranges":["<1.9.2"],"fixed":["1.9.2"]}]},{"id":"PYSEC-2026-2586","url":"https://osv.dev/vulnerability/PYSEC-2026-2586","summary":"Lemur: Crafted CRL/OCSP URLs in uploaded certificates lead to post-authentication SSRF","modified":"2026-07-13T16:32:02.487758586Z","packages":[{"ecosystem":"PyPI","name":"lemur","purl":"pkg:pypi/lemur","ranges":["<1.9.2"],"fixed":["1.9.2"]}]}],"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."]}