# CVE-2026-113593: Potential exposure of private data via empty and missing Vary headers

Status: published. Published: 2026-11-03. Updated: 2026-11-03.

An issue was discovered in Django 6.1 before 6.1.3, 6.0 before 6.0.10, and 5.2 before 5.2.19.
The `django.middleware.cache.UpdateCacheMiddleware` and the `django.views.decorators.cache.cache_page()` decorator generate identical cache keys for requests that omit a header listed in the response’s `Vary` header and requests that include that header with an empty value, potentially allowing remote attackers to access private data cached for another request.
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 Andrew Gonzalez for reporting this issue.

## Remediation

- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: DSF) — https://github.com/django/django/commit/c0b7e5e4e4546e8ddc58262f1945938bb9d9ac2d
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: DSF) — https://github.com/django/django/commit/55e2e009b4f3996e5c55af7b22a8c41eb826e892
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: DSF) — https://github.com/django/django/commit/2006a2b068766bf332f1afcc32b7614d8e5759a2
- fix: The reporting source identifies this reference as a patch. Check the advisory for affected versions and supported release branches. (source: CNA: DSF) — https://github.com/django/django/commit/9007fecd3633cfd90b093ebe106af564347c8aee

## Affected products and versions

- djangoproject / Django (django): ≥ 6.1; < 6.1.3 (affected, python); 6.1.3 (unaffected, python); ≥ 6.0; < 6.0.10 (affected, python); 6.0.10 (unaffected, python); ≥ 5.2; < 5.2.19 (affected, python); 5.2.19 (unaffected, python). Source: CNA: DSF

## Severity and prioritization

- CVSS 3.1: 3.1 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N; source: CNA: DSF

- CVSS 4.0: 2.3 (low); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N; source: CNA: DSF

- CVSS 4.0: 2.3 (low); CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:L/VI:N/VA:N/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; source: NVD: 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92

- CVSS 3.1: 3.1 (low); CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:L/I:N/A:N; source: NVD: 6a34fbeb-21d4-45e7-8e0a-62b95bc12c92

- CISA KEV: No listing in collected sources

- EPSS: Not available

- SSVC: exploitation none; automatable no; technical impact partial; source ADP: CISA-ADP

- Weaknesses: CWE-524

## Exploit evidence

No exploit evidence in collected sources. This is not proof of no exploitation.

## References

- https://docs.djangoproject.com/en/dev/releases/security/ (CNA: DSF; vendor-advisory)

- https://groups.google.com/g/django-announce (CNA: DSF; mailing-list)

- https://github.com/django/django/commit/c0b7e5e4e4546e8ddc58262f1945938bb9d9ac2d (CNA: DSF; patch)

- https://github.com/django/django/commit/55e2e009b4f3996e5c55af7b22a8c41eb826e892 (CNA: DSF; patch)

- https://github.com/django/django/commit/2006a2b068766bf332f1afcc32b7614d8e5759a2 (CNA: DSF; patch)

- https://github.com/django/django/commit/9007fecd3633cfd90b093ebe106af564347c8aee (CNA: DSF; patch)

- https://www.djangoproject.com/weblog/2026/nov/03/security-releases/ (CNA: DSF; vendor-advisory)

- https://docs.djangoproject.com/en/dev/releases/security/ (6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

- https://github.com/django/django/commit/2006a2b068766bf332f1afcc32b7614d8e5759a2 (6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

- https://github.com/django/django/commit/55e2e009b4f3996e5c55af7b22a8c41eb826e892 (6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

- https://github.com/django/django/commit/9007fecd3633cfd90b093ebe106af564347c8aee (6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

- https://github.com/django/django/commit/c0b7e5e4e4546e8ddc58262f1945938bb9d9ac2d (6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

- https://groups.google.com/g/django-announce (6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

- https://www.djangoproject.com/weblog/2026/nov/03/security-releases/ (6a34fbeb-21d4-45e7-8e0a-62b95bc12c92)

## Provenance

- CNA: DSF: https://www.cve.org/CVERecord?id=CVE-2026-113593; retrieved 2026-11-03; source updated 2026-11-03

- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-113593; retrieved 2026-11-03; source updated 2026-11-03

Revision: 0c1c10a7694c0536517eb0350de15022b0b3fec43b856e39fb27e7643cb212fc

Canonical: https://y2.dev/cve/CVE-2026-113593

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