Service interruption via unbounded domain-label validation
Published Jul 3, 2023 · Updated Nov 4, 2025
ReDoS in Django 3.2 before 3.2.20, 4.1 before 4.1.10, and 4.2 before 4.2.3 allows remote attackers to interrupt services. EmailValidator and URLValidator apply regular expressions to unbounded values containing very large numbers of domain labels, causing excessive CPU-consuming match work. Exploitation requires an application to pass attacker-controlled email or URL data to either validator; the impact is request delay or service interruption, not data disclosure or modification.
Summary
What happened
ReDoS in Django 3.2 before 3.2.20, 4.1 before 4.1.10, and 4.2 before 4.2.3 allows remote attackers to interrupt services. EmailValidator and URLValidator apply regular expressions to unbounded values containing very large numbers of domain labels, causing excessive CPU-consuming match work. Exploitation requires an application to pass attacker-controlled email or URL data to either validator; the impact is request delay or service interruption, not data disclosure or modification.
The record
- CVE
- CVE-2023-36053
- Published
- Jul 3, 2023
- Updated
- Nov 4, 2025
- Vendor
- Debian
- Product
- Debian GNU/Linux
- Classifications
- CWE-1333, T1499.002
- Attack vector
- network
- Privileges
- unauthenticated
Timeline
How it unfolded
- Jul 3, 2023CVE publishedPublication date reported by the CVE source.
- Nov 4, 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?
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- Affected versionversion=10.0
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What is affected?
Published CVSS scores
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Attacks
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Public exploit references
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Technologies
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Your stack
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