Vulnerability · Published Sep 15, 2026 · Assigned by VulnCheck
CVE-2026-91979Vikunja before 2.6.0 Denial of Service via Decompression Bomb
Medium 6.5
In plain English
A medium-severity uncontrolled resource consumption in vikunja from go-vikunja. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.4% (higher than 38% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.
Severity (CVSS 3.1)6.5Medium
Exploit odds (30 days)0.4%top 62.0% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known
Official description
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.
Affected packages & fixed versions
| Ecosystem | Package | Fixed in | Advisory |
|---|---|---|---|
| Go | code.vikunja.io/api | 2.6.0 | GHSA-w7jp-mf2v-8342 |
| Go | code.vikunja.io/api | no fix listed | GO-2026-6756 |
Affected products (as reported)
| Vendor | Product | Versions |
|---|---|---|
| go-vikunja | vikunja | 0 – before 2.6.0 |
Weakness: CWE-400 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
References
- GitHub Security Advisory (GHSA-w7jp-mf2v-8342) vendor-advisory
- VulnCheck Advisory: Vikunja before 2.6.0 Denial of Service via Decompression Bomb third-party-advisory