PYSEC-2021-108

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Import Source
https://github.com/pypa/advisory-database/blob/main/vulns/urllib3/PYSEC-2021-108.yaml
JSON Data
https://api.osv.dev/v1/vulns/PYSEC-2021-108
Aliases
Published
2021-06-29T11:15:00Z
Modified
2026-06-08T10:15:12.134263625Z
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

PyPI / urllib3

Package

Name
urllib3
View open source insights on deps.dev
Purl
pkg:pypi/urllib3

Affected ranges

Type
GIT
Repo
https://github.com/urllib3/urllib3
Events
Introduced
0 Unknown introduced commit / All previous commits are affected
Fixed
2d4a3fee6de2fa45eb82169361918f759269b4ec
Type
ECOSYSTEM
Events
Introduced
1.25.4
Fixed
1.26.5

Affected versions

0.*
0.3
0.3.1
0.4
0.4.1
1.*
1.1
1.2
1.2.1
1.3
1.4
1.5
1.6
1.7
1.7.1
1.25
1.25.1
1.25.2
1.25.3
1.25.4
1.25.5
1.25.6
1.25.7
1.25.8
1.25.9
1.25.10
1.25.11
1.26.0
1.26.1
1.26.2
1.26.3
1.26.4

Database specific

source 
"https://github.com/pypa/advisory-database/blob/main/vulns/urllib3/PYSEC-2021-108.yaml"