Lemur: Server-Side Request Forgery via the ACME client following server-controlled URLs

Date Aug 18, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product PyPI · lemur

CVE CVE-2026-70666

High-risk advisory CVE-2026-70666

Summary

Lemur: Server-Side Request Forgery via the ACME client following server-controlled URLs

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-xpmj-wjcp-6pww NVD — CVE-2026-70666 Source reference

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

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