{"cve":"CVE-2026-3902","nvd":{"published":"2026-04-07T15:17:46.353","modified":"2026-10-26T21:10:00.170","status":"Analyzed","description":"An issue was discovered in 6.0 before 6.0.4, 5.2 before 5.2.13, and 4.2 before 4.2.30.\n`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.\nEarlier, unsupported Django series (such as 5.0.x, 4.1.x, and 3.2.x) were not evaluated and may also be affected.\nDjango would like to thank Tarek Nakkouch for reporting this issue.","cvss_v4":null,"cvss_v3":{"version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N","score":7.5},"cwes":["CWE-290"],"references":["https://docs.djangoproject.com/en/dev/releases/security/","https://groups.google.com/g/django-announce","https://www.djangoproject.com/weblog/2026/apr/07/security-releases/"],"products":["djangoproject:django"],"source":"nvd","synced_at":"2026-10-26T21:38:48.864438205+00:00"},"epss":{"cve":"CVE-2026-3902","score":0.00436,"percentile":0.37604,"date":"2026-10-26"},"kev":null,"osv":[{"id":"GHSA-mvfq-ggxm-9mc5","url":"https://osv.dev/vulnerability/GHSA-mvfq-ggxm-9mc5","summary":"Django vulnerable to ASGI header spoofing via underscore/hyphen conflation","modified":"2026-09-10T03:50:44.836232007Z","packages":[{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=6.0 <6.0.4"],"fixed":["6.0.4"]},{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=5.2 <5.2.13"],"fixed":["5.2.13"]},{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=4.2 <4.2.30"],"fixed":["4.2.30"]}]},{"id":"PYSEC-2026-51","url":"https://osv.dev/vulnerability/PYSEC-2026-51","summary":"","modified":"2026-06-10T17:01:10.789764702Z","packages":[{"ecosystem":"PyPI","name":"django","purl":"pkg:pypi/django","ranges":[">=4.2 <4.2.30",">=5.2 <5.2.13",">=6.0 <6.0.4"],"fixed":["4.2.30","5.2.13","6.0.4"]}]}],"attribution":["This product uses the NVD API but is not endorsed or certified by the NVD.","EPSS scores: FIRST Exploit Prediction Scoring System, https://www.first.org/epss","Known exploited vulnerabilities: CISA Known Exploited Vulnerabilities Catalog, https://www.cisa.gov/known-exploited-vulnerabilities-catalog","Package advisories: OSV (https://osv.dev), from the GitHub Advisory Database, PyPA, Go, RustSec and other ecosystem databases, under CC-BY 4.0 or CC0","CVE records: the CVE Program's CVE List (https://www.cve.org), under its terms of use (https://www.cve.org/Legal/TermsOfUse). CVE is a registered trademark of The MITRE Corporation; this product is not affiliated with the CVE Program."]}