CVE Watch28 ago 2026

CVE-2026-55520

Protego is a pure-Python robots.txt parser with support for modern conventions. Prior to 0.6.2, protego._urlpattern._URLPattern._prepare_pat

CVSS

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Sin CVSS

EPSS

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KEV

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Exploit Today

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0-100

Publicado: 28 ago 2026 · Última mod.: 28 ago 2026 · CWE-400 · CWE-1333

EPSS · 30d

Sin historial EPSS suficiente todavía.

Descripción técnica

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.

Referencias oficiales

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