CVE-2026-3902
An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30. `ASGIRequest` allows a remote attacker to spoof headers by exploiting an ambiguous mapping of two header variants (with hyphens or with underscores) to a single version with underscores. 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 Tarek Nakkouch for reporting this issue.
- CVSS 3.1
- 7.5
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N - EPSS
- 0.4% chance of exploitation in the next 30 days; higher than 37% of CVEs (scores of 2026-10-26)
- CWE
- CWE-290
- Published
- Modified
- Record from
- the NVD, synced
Affected
- djangoproject:django
Packages (OSV)
| Advisory | Ecosystem | Package | Affected | Fixed in |
|---|---|---|---|---|
| GHSA-mvfq-ggxm-9mc5 | PyPI | django | >=6.0 <6.0.4 | 6.0.4 |
| GHSA-mvfq-ggxm-9mc5 | PyPI | django | >=5.2 <5.2.13 | 5.2.13 |
| GHSA-mvfq-ggxm-9mc5 | PyPI | django | >=4.2 <4.2.30 | 4.2.30 |
| PYSEC-2026-51 | PyPI | django | >=4.2 <4.2.30 >=5.2 <5.2.13 >=6.0 <6.0.4 | 4.2.30, 5.2.13, 6.0.4 |