CVE-2026-55520
HighCVSS 7.1Exploitation Probability (EPSS)
Low risk30th percentile - higher than 30% of all known CVEs
Summary
Protego before version 0.6.2 translates every asterisk in Allow or Disallow directives into a lazy regex wildcard, causing exponential backtracking with many asterisks. Processing a crafted robots.txt can cause long URL matching and denial of service.
Risk Assessment
An attacker can slow down or halt a crawler, leading to unavailability of indexing services.
Recommendation
Update Protego to version 0.6.2 which contains the fix.
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Original NVD description (English source)
Protego is a pure-Python robots.txt parser with support for modern conventions. Prior to 0.6.2, protego._urlpattern._URLPattern._prepare_pattern_for_regex translates every asterisk in an Allow or Disallow directive into a lazy regular-expression wildcard, so a directive containing many asterisks creates exponential backtracking. After protego.Protego.parse processes a crafted robots.txt file, protego.Protego.can_fetch can spend an attacker-controlled period matching a near-miss URL and deny service to the crawler. The vulnerable path is src/protego/_urlpattern.py in the _URLPattern match logic. This issue is fixed in version 0.6.2.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS

