CVE-2025-14550 PUBLISHED

Potential denial-of-service vulnerability via repeated headers when using ASGI

Assigner: DSF
Reserved: 11.12.2025 Published: 03.02.2026 Updated: 03.02.2026

An issue was discovered in 6.0 before 6.0.2, 5.2 before 5.2.11, and 4.2 before 4.2.28. ASGIRequest allows a remote attacker to cause a potential denial-of-service via a crafted request with multiple duplicate headers. 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 Jiyong Yang for reporting this issue.

Product Status

Vendor djangoproject
Product Django
Versions Default: unaffected
  • affected from 6.0 to 6.0.2 (excl.)
  • Version 6.0.2 is unaffected
  • affected from 5.2 to 5.2.11 (excl.)
  • Version 5.2.11 is unaffected
  • affected from 4.2 to 4.2.28 (excl.)
  • Version 4.2.28 is unaffected
Vendor djangoproject
Product asgiref
Versions Default: unaffected
  • affected from 3 to 3.11.1 (excl.)
  • Version 3.11.1 is unaffected

Credits

  • Jiyong Yang reporter
  • Jake Howard remediation developer
  • Jacob Walls coordinator

References

Problem Types

  • CWE-407: Inefficient Algorithmic Complexity CWE

Impacts

  • CAPEC-130: Excessive Allocation