How severe is CVE-2026-3902?

CVE-2026-3902 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.

Is CVE-2026-3902 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-3902?

CVE-2026-3902 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-3902?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.

Does CVE-2026-3902 have an EU (EUVD) identifier?

Yes. CVE-2026-3902 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19686.

When was CVE-2026-3902 published?

CVE-2026-3902 was published on 2026-04-07 and last updated on 2026-06-17.

CVE-2026-3902

CVE-2026-3902 is a high-severity vulnerability in Djangoproject Django with a CVSS 3.x base score of 7.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-290.

Key facts

Severity: High (CVSS 3.x base score 7.5)
EPSS exploit prediction: 0% (35th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-19686
Weakness: CWE-290
Affected product: Djangoproject Django
Published: 2026-04-07
Last modified: 2026-06-17

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.

Frequently asked questions

What is 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.
How severe is CVE-2026-3902?: CVE-2026-3902 has a CVSS 3.x base score of 7.5, rated high severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability none.
Is CVE-2026-3902 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (35th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-3902?: CVE-2026-3902 affects Djangoproject Django. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-3902?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its high severity, prioritise patching exposed systems.
Does CVE-2026-3902 have an EU (EUVD) identifier?: Yes. CVE-2026-3902 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-19686.
When was CVE-2026-3902 published?: CVE-2026-3902 was published on 2026-04-07 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:djangoproject:django:*:*:*:*:*:*:*:*

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