Resource Exhaustion Affecting python-protego package, versions *
Threat Intelligence
The probability is the direct output of the EPSS model, and conveys an overall sense of the threat of exploitation in the wild. The percentile measures the EPSS probability relative to all known EPSS scores. Note: This data is updated daily, relying on the latest available EPSS model version. Check out the EPSS documentation for more details.
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Test your applications- Snyk IDSNYK-DEBIAN11-PYTHONPROTEGO-17496270
- published26 Jun 2026
- disclosed28 Aug 2026
Introduced: 26 Jun 2026
CVE-2026-55520 (opens in a new tab)How to fix?
There is no fixed version for Debian:11 python-protego.
NVD Description
Note: Versions mentioned in the description apply only to the upstream python-protego package and not the python-protego package as distributed by Debian.
See How to fix? for Debian:11 relevant fixed versions and status.
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.