Protego has exponential backtracking ReDoS in robots.txt URL wildcard matching

Date Aug 28, 2026

Type Vendor advisory

Signal High-risk advisory

Vendor / Product PyPI · Protego

CVE CVE-2026-55520

High-risk advisory CVE-2026-55520

Summary

Protego has exponential backtracking ReDoS in robots.txt URL wildcard matching

Why it matters

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

Operator check

Check whether Protego is present in application dependency manifests, lockfiles, or build images. Review the GitHub advisory and upgrade to a patched version where available. CVSS score: 7.1.

Sources

GitHub Advisory GHSA-wjmf-p669-5m5p NVD — CVE-2026-55520 Source reference

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

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