Injection via unsanitized URL control characters
Published Feb 9, 2022 · Updated Dec 17, 2025
Injection in CPython urllib.parse before 3.10.0b1, 3.9.5, 3.8.11, 3.7.11, and 3.6.14 allows attackers to alter downstream URL handling. The urlsplit parser, which underpins urlparse, fails to remove ASCII carriage returns, line feeds, and tabs before splitting and returning URL components. Exploitation requires an application to parse an attacker-controlled URL and pass the result to a downstream component, where the control characters can alter interpretation.
Summary
What happened
Injection in CPython urllib.parse before 3.10.0b1, 3.9.5, 3.8.11, 3.7.11, and 3.6.14 allows attackers to alter downstream URL handling. The urlsplit parser, which underpins urlparse, fails to remove ASCII carriage returns, line feeds, and tabs before splitting and returning URL components. Exploitation requires an application to parse an attacker-controlled URL and pass the result to a downstream component, where the control characters can alter interpretation.
The record
- CVE
- CVE-2022-0391
- Published
- Feb 9, 2022
- Updated
- Dec 17, 2025
- Vendor
- Python Software Foundation
- Product
- CPython
- Classifications
- CWE-74
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Feb 9, 2022CVE publishedPublication date reported by the CVE source.
- Dec 17, 2025Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=python 3.10.0b1, python 3.9.5, python 3.8.11, python 3.7.11, python 3.6.14
What conditions does exploitation require?
What is affected?
Attacks
What attackers are doing with it
Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.
Weakness, pattern, technique
Public exploit references
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Technologies
Your stack
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Your stack
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