CVE-2026-5766 Affecting authentik-2026.2 package, versions <2026.2.1-r9


Severity

Recommended
low

Based on default assessment until relevant scores are available.

Threat Intelligence

EPSS
0.42% (34th percentile)

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  • Snyk IDSNYK-CHAINGUARDLATEST-AUTHENTIK20262-16700871
  • published15 May 2026
  • disclosed5 May 2026

Introduced: 5 May 2026

CVE-2026-5766  (opens in a new tab)

How to fix?

Upgrade Chainguard authentik-2026.2 to version 2026.2.1-r9 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream authentik-2026.2 package and not the authentik-2026.2 package as distributed by Chainguard. See How to fix? for Chainguard relevant fixed versions and status.

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.

CVSS Base Scores

version 3.1