CVE-2026-91979

MEDIUM 6.5

Vikunja before 2.6.0 Denial of Service via Decompression Bomb

CVSS Score

6.5

EPSS Score

0.0%

EPSS Percentile

0th

Vikunja before 2.6.0 fails to limit archive expansion during data import, allowing authenticated users to cause denial of service. Attackers can upload highly compressed files that expand to tens of gigabytes in memory and disk, exhausting server resources and crashing the instance.

CWE	CWE-400
Vendor	go-vikunja
Product	vikunja
Published	Sep 15, 2026

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CVSS v3 Breakdown

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

Attack Vector

Network

Attack Complexity

Low

Privileges Required

Low

User Interaction

None

Scope

Unchanged

Confidentiality

None

Integrity

None

Availability

High

Affected Versions

go-vikunja / vikunja

0 < 2.6.0

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/go-vikunja/vikunja/security/advisories/GHSA-w7jp-mf2v-8342 vulncheck.com: https://www.vulncheck.com/advisories/vikunja-before-2.6.0-denial-of-service-via-decompression-bomb

Credits

🔍 Str1ckl4nd 🔍 7thParkk 🔍 0xcelien 🔍 JellowBeanz26