Denial of Service Vulnerability in Vikunja Product by Vikunja
CVE-2026-91971

7.1HIGH

Key Information:

Vendor

Go-vikunja

Status
Vikunja
Vendor
CVE Published:
15 September 2026

What is CVE-2026-91971?

Vikunja versions prior to 2.6.0 have a vulnerability that allows authenticated users to exploit avatar and project background upload endpoints. By bypassing pixel decode limits, attackers can upload images with extreme aspect ratios, leading to excessive CPU and memory consumption during processing. This can result in denial of service due to repeated or concurrent uploads, severely impacting system performance and availability.

Affected Version(s)

vikunja 0 < 2.6.0

vikunja 2.6.0

References

https://github.com/go-vikunja/vikunja/security/advisories...
vendor-advisory
https://www.vulncheck.com/advisories/vikunja-before-2.6.0...
third-party-advisory

CVSS V4

Score:
7.1
Severity:
HIGH
Confidentiality:
None
Integrity:
None
Availability:
High
Attack Vector:
Network
Attack Complexity:
Low
Attack Required:
None
Privileges Required:
Undefined
User Interaction:
None

Timeline

  • Vulnerability published

  • Vulnerability Reserved

Credit

Str1ckl4nd
7thParkk
JellowBeanz26
.