DEBIAN-CVE-2026-55520

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Source
https://security-tracker.debian.org/tracker/CVE-2026-55520
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55520.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-55520
Upstream
Published
2026-08-28T20:18:28Z
Modified
2026-10-01T01:03:28Z
Summary
[none]
Details

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.

References

Affected packages

Debian:12 / python-protego

Package

Name
python-protego
Purl
pkg:deb/debian/python-protego?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.2.1+dfsg-1
0.3.0+dfsg-1
0.3.1+dfsg-1
0.4.0+dfsg-1
0.5.0+dfsg-1
0.6.0+dfsg-1
0.6.2+dfsg-1
0.7.0+dfsg-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55520.json"

Debian:13 / python-protego

Package

Name
python-protego
Purl
pkg:deb/debian/python-protego?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

0.*
0.4.0+dfsg-1
0.5.0+dfsg-1
0.6.0+dfsg-1
0.6.2+dfsg-1
0.7.0+dfsg-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55520.json"

Debian:14 / python-protego

Package

Name
python-protego
Purl
pkg:deb/debian/python-protego?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
0.6.2+dfsg-1

Affected versions

0.*
0.4.0+dfsg-1
0.5.0+dfsg-1
0.6.0+dfsg-1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-55520.json"