DEBIAN-CVE-2021-33503

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Source
https://security-tracker.debian.org/tracker/CVE-2021-33503
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-33503.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2021-33503
Upstream
Published
2021-06-29T11:15:07Z
Modified
2026-10-21T18:03:14Z
Summary
[none]
Details

An issue was discovered in urllib3 before 1.26.5. When provided with a URL containing many @ characters in the authority component, the authority regular expression exhibits catastrophic backtracking, causing a denial of service if a URL were passed as a parameter or redirected to via an HTTP redirect.

References

Affected packages

Debian:12 / python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/debian/python-urllib3?arch=source&distro=bookworm

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.26.5-1~exp1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-33503.json"

Debian:13 / python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/debian/python-urllib3?arch=source&distro=trixie

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.26.5-1~exp1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-33503.json"

Debian:14 / python-urllib3

Package

Name
python-urllib3
Purl
pkg:deb/debian/python-urllib3?arch=source&distro=forky

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected
Fixed
1.26.5-1~exp1

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2021-33503.json"