Lemur: ACME SSRF + creator-equality IDOR lead to AWS IAM/PKI compromise

Date Jun 25, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product PyPI · lemur

CVE CVE-2026-55166

High-risk advisory CVE-2026-55166

Summary

Lemur: ACME SSRF + creator-equality IDOR lead to AWS IAM/PKI compromise

Why it matters

GitHub has published a reviewed security advisory for lemur. Prioritize it with other application dependency updates.

Operator check

Check whether lemur is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available.

Sources

GitHub Advisory GHSA-v2wp-frmc-5q3v NVD — CVE-2026-55166 Source reference

PatchBrief uses public sources. It does not scan environments, verify exposure, or replace vendor guidance.

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