Potential denial-of-service vulnerability in check_for_language()

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-15337
StatePUBLISHED
AssignerDSF
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-04 17:16:46 UTC
Updated2026-08-04 18:16:44 UTC
DescriptionAn issue was discovered in Django 5.2 before 5.2.17 and 6.0 before 6.0.8. `django.utils.translation.check_for_language()` is subject to a potential denial-of-service attack when given many distinct, very long language codes, which are retained as keys in an in-memory cache and consume process memory. Such codes reach the function through the `django.views.i18n.set_language()` view, which is not routed by default. The consumed memory is bounded, since request data is limited by the `DATA_UPLOAD_MAX_MEMORY_SIZE` setting (default 2.5 MB) and the cache holds a fixed maximum number of entries. Earlier, unsupported Django series (such as 5.1.x, 5.0.x, and 4.2.x) were not evaluated and may also be affected. Django would like to thank Jaeyoung Jang for reporting this issue.

Risk And Classification

Primary CVSS: v4.0 6.9 MEDIUM from 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92

CVSS:4.0/AV:N/AC:L/AT:N/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

Problem Types: CWE-789 | CWE-789 CWE-789: Memory Allocation with Excessive Size Value

VersionSourceTypeScoreSeverityVector
4.06a34fbeb-21d4-45e7-8e0a-62b95bc12c92Secondary6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:X/C...
4.0CNADECLARED6.9MEDIUMCVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N
3.16a34fbeb-21d4-45e7-8e0a-62b95bc12c92Secondary5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L
3.1CNADECLARED5.3MEDIUMCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:L

CVSS v4.0 Breakdown

Attack Vector
Network
Attack Complexity
Low
Attack Requirements
None
Privileges Required
None
User Interaction
None
Confidentiality
None
Integrity
None
Availability
Low
Sub Conf.
None
Sub Integrity
None
Sub Availability
None

CVSS:4.0/AV:N/AC:L/AT:N/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

CVSS v3.1 Breakdown

Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
Low

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Djangoproject Django affected 6.0 6.0.8 python Not specified
CNA Djangoproject Django unaffected 6.0.8 python Not specified
CNA Djangoproject Django affected 5.2 5.2.17 python Not specified
CNA Djangoproject Django unaffected 5.2.17 python Not specified

References

ReferenceSourceLinkTags
github.com/django/django/commit/224dbc832586ad5cfb0237c2ff30d14baeaddc6f 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
github.com/django/django/commit/c72a5dbb64d0777f3f471f1be94e8b2ca91e0959 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
github.com/django/django/commit/5b3523d29be25948e1dd90b3863a002f00fc865f 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
www.djangoproject.com/weblog/2026/aug/04/security-releases 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 www.djangoproject.com
groups.google.com/g/django-announce 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 groups.google.com
docs.djangoproject.com/en/dev/releases/security 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 docs.djangoproject.com
github.com/django/django/commit/27137e655e442e81095f1f8f77ff3870d9fdf169 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92 github.com
CVE Program record CVE.ORG www.cve.org canonical
NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

Vendor Comments And Credit

Discovery Credit

CNA: Jaeyoung Jang (en)

CNA: Natalia Bidart (en)

CNA: Natalia Bidart (en)

Additional Advisory Data

SourceTimeEvent
CNA2026-07-02T00:00:00.000ZInitial report received.
CNA2026-07-21T00:00:00.000ZVulnerability confirmed.
CNA2026-08-04T10:00:00.000ZSecurity release issued.

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