ASGI header spoofing via underscore/hyphen conflation_CVE-2026-3902

7.5 / 10

HIGH

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N

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.
`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.

Basic Information

ID CVE-2026-3902

Source DSF

Published Apr 7, 2026 at 14:22

Modified Apr 7, 2026 at 16:14

Affected Product

Vendor djangoproject

Product Django

Version 6.0

Affected Versions djangoproject Django 6.0
djangoproject Django 5.2
djangoproject Django 4.2

CWE Classification

CWE-290

References

{
    "lastseen": "",
    "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.",
    "published": "2026-04-07T14:22:07.190Z",
    "modified": "2026-04-07T16:14:07.198Z",
    "type": "cve",
    "title": "ASGI header spoofing via underscore/hyphen conflation",
    "source": "DSF",
    "references": "https://docs.djangoproject.com/en/dev/releases/security/\nhttps://groups.google.com/g/django-announce\nhttps://www.djangoproject.com/weblog/2026/apr/07/security-releases/",
    "id": "CVE-2026-3902",
    "bulletinFamily": "",
    "cwe": [
        "CWE-290"
    ],
    "cvelist": null,
    "sourceData": "djangoproject Django 6.0\ndjangoproject Django 5.2\ndjangoproject Django 4.2",
    "sourceHref": "",
    "cvss": {
        "score": 7.5,
        "severity": "HIGH",
        "vector": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N",
        "version": "3.1"
    },
    "cvss2": [],
    "cvss3": {
        "version": "",
        "vectorString": "",
        "baseScore": 0,
        "baseSeverity": "",
        "attackVector": "",
        "attackComplexity": "",
        "privilegesRequired": "",
        "userInteraction": "",
        "scope": "",
        "confidentialityImpact": "",
        "integrityImpact": "",
        "availabilityImpact": "",
        "cvssV3": {
            "version": "",
            "vectorString": "",
            "baseScore": 0,
            "baseSeverity": "",
            "attackVector": "",
            "attackComplexity": "",
            "privilegesRequired": "",
            "userInteraction": "",
            "scope": "",
            "confidentialityImpact": "",
            "integrityImpact": "",
            "availabilityImpact": ""
        }
    },
    "href": "",
    "category_name": "CVE",
    "post_link": "",
    "product": "Django",
    "version": "6.0",
    "vendor": "djangoproject",
    "ai_description": "",
    "ai_severity": "",
    "ai_vendor": "",
    "ai_product": "",
    "ai_version": "",
    "ai_score": 0
}