EUVD-2026-27381
GHSA-w26r-rmm8-9c29
Severity by source
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
Primary rating from NVD.
CVSS VectorNVD
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
Lifecycle Timeline
2Blast Radius
ecosystem impact- 12 pypi packages depend on django (12 direct, 0 indirect)
Ecosystem-wide dependent count for version 5.2.
DescriptionCVE.org
An issue was discovered in 6.0 before 6.0.5 and 5.2 before 5.2.14. ASGI requests with a missing or understated Content-Length header can bypass the FILE_UPLOAD_MAX_MEMORY_SIZE limit, potentially loading large files into memory and causing service degradation.
As a reminder, Django expects a limit to be configured at the web server level rather than solely relying on FILE_UPLOAD_MAX_MEMORY_SIZE. 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 Kyle Agronick for reporting this issue.
AnalysisAI
Django 6.0 before 6.0.5 and 5.2 before 5.2.14 allow remote attackers to bypass the FILE_UPLOAD_MAX_MEMORY_SIZE limit by submitting ASGI requests with missing or understated Content-Length headers, potentially loading large files into memory and causing denial of service through resource exhaustion. No active exploitation confirmed, but the vulnerability requires only network access and no authentication, making it trivially exploitable once the bypass is understood.
Technical ContextAI
Django's file upload handling in ASGI mode relies on the Content-Length header to enforce the FILE_UPLOAD_MAX_MEMORY_SIZE setting, which limits in-memory file storage to prevent memory exhaustion attacks. CWE-130 (Improper Handling of Length Parameters) identifies the root cause: the framework fails to validate or enforce upload size limits when the Content-Length header is absent, malformed, or intentionally understated by a client. This affects ASGI deployments specifically, as the ASGI specification requires servers to parse headers from incoming requests. When Content-Length is missing or incorrect, Django does not fall back to an alternative size-checking mechanism, allowing attackers to stream arbitrarily large payloads into memory buffers without triggering the intended protective limit.
RemediationAI
Upgrade Django to version 6.0.5 or later for Django 6.0 users, or 5.2.14 or later for Django 5.2 users. Apply the security releases from the Django project's May 2026 security release announcement. As a compensating control, configure file upload limits at the web server layer (nginx, Apache, or equivalent), independent of Django's FILE_UPLOAD_MAX_MEMORY_SIZE setting-this is Django's recommended practice and will prevent exploitation even on unpatched or unsupported versions. Additionally, deploy a reverse proxy or load balancer that validates and enforces Content-Length constraints before requests reach the Django application, ensuring malformed or missing headers trigger rejection rather than processing. Monitor application memory usage and implement per-request memory quotas to detect and halt anomalously large uploads in real time.
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View allVendor StatusVendor
SUSE
Severity: Medium| Product | Status |
|---|---|
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | Fixed |
| openSUSE Leap 16.0 | Fixed |
| openSUSE Tumbleweed | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP7 | Fixed |
| SUSE Linux Enterprise Module for Package Hub 15 SP6 | Fixed |
| openSUSE Leap 15.6 | Fixed |
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External POC / Exploit Code
Leaving vuln.today