Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler
Published Apr 10, 2026
6.5
MEDIUMCVSS 3.1
EPSS 0.58%
Description
Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the addRepeatIntervalToTime function uses an O(n) loop that advances a date by the task's RepeatAfter duration until it exceeds the current time. By creating a repeating task with a 1-second interval and a due date far in the past, an attacker triggers billions of loop iterations, consuming CPU and holding a database connection for minutes per request. This vulnerability is fixed in 2.3.0.
Affected products
-
- Version < 2.3.0StatusaffectedConstraints-
- Version
Default status is the baseline for the product, each version can override it (e.g. patched versions marked unaffected).
| Vendor | Product | Default status | Versions | ||||||
|---|---|---|---|---|---|---|---|---|---|
| GO-Vikunja | Vikunja | n/a |
|
No data.
No Red Hat product state for this CVE.
code.vikunja.io/api
Go
Introduced 0 Fixed not fixed
| Ecosystem | Package | Introduced | Fixed |
|---|---|---|---|
| Go | code.vikunja.io/api | 0 | not fixed |
Remediation
No remediation recorded yet.
References (7)
- https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-21426 Advisory
- https://github.com/advisories/GHSA-r4fg-73rc-hhh7 Advisory
- https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b x_refsource_MISCPatch
- https://github.com/go-vikunja/vikunja/pull/2577 x_refsource_MISCIssue Tracking
- https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0 x_refsource_MISCRelease Notes
- https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7 x_refsource_CONFIRMExploitVendor Advisory
- https://nvd.nist.gov/vuln/detail/CVE-2026-35599
| Link | Providers | Tags |
|---|---|---|
| https://euvd.enisa.europa.eu/vulnerability/EUVD-2026-21426 | Advisory | |
| https://github.com/advisories/GHSA-r4fg-73rc-hhh7 | Advisory | |
| https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b | x_refsource_MISCPatch | |
| https://github.com/go-vikunja/vikunja/pull/2577 | x_refsource_MISCIssue Tracking | |
| https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0 | x_refsource_MISCRelease Notes | |
| https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7 | x_refsource_CONFIRMExploitVendor Advisory | |
| https://nvd.nist.gov/vuln/detail/CVE-2026-35599 |
Change history (0)
No recorded changes yet.