Potential denial-of-service vulnerability in URLField via Unicode normalization on Windows
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.0.3, 5.2.12, 4.2.29
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: yes
- Technical impact: partial
Summary
An issue was discovered in 6.0 before 6.0.3, 5.2 before 5.2.12, and 4.2 before 4.2.29. `URLField.to_python()` in Django calls `urllib.parse.urlsplit()`, which performs NFKC normalization on Windows that is disproportionately slow for certain Unicode characters, allowing a remote attacker to cause denial of service via large URL inputs containing these characters. Earlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected. Django would like to thank Seokchan Yoon for reporting this issue.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: yes · Technical impact: partial
- Record last updated
Affected versions
- django
From 6.0 · fixed in 6.0.3; From 5.2 · fixed in 5.2.12; From 4.2 · fixed in 4.2.29
- djangoPyPI
From 4.2 · fixed in 4.2.29; From 5.2 · fixed in 5.2.12; From 6.0 · fixed in 6.0.3
- djangoPyPI
From 6.0 · fixed in 6.0.3
- djangoPyPI
From 5.2 · fixed in 5.2.12
- djangoPyPI
From 4.2 · fixed in 4.2.29