{"id":"CVE-2026-35599","state":"PUBLISHED","title":"Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler","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.","publishedAt":"2026-04-10T16:05:57.581Z","updatedAt":"2026-04-10T18:28:29.310Z","severity":{"score":6.5,"label":"Medium","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","source":"GitHub_M"},"assigner":"GitHub_M","products":["go-vikunja vikunja"],"affected":[{"vendor":"go-vikunja","product":"vikunja","versions":[{"version":"< 2.3.0","status":"affected"}]}],"references":["https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7","https://github.com/go-vikunja/vikunja/pull/2577","https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b","https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0"],"weaknesses":["CWE-407"],"ingestedAt":"2026-10-29T20:11:40.391Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/35xxx/CVE-2026-35599.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-35599","state":"PUBLISHED","datePublished":"2026-04-10T16:05:57.581Z","dateUpdated":"2026-04-10T18:28:29.310Z","assignerShortName":"GitHub_M","assignerOrgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateReserved":"2026-04-03T21:25:12.162Z"},"containers":{"cna":{"title":"Vikunja has an Algorithmic Complexity DoS in Repeating Task Handler","descriptions":[{"lang":"en","value":"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":[{"vendor":"go-vikunja","product":"vikunja","versions":[{"version":"< 2.3.0","status":"affected"}]}],"references":[{"url":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7","name":"https://github.com/go-vikunja/vikunja/security/advisories/GHSA-r4fg-73rc-hhh7","tags":["x_refsource_CONFIRM"]},{"url":"https://github.com/go-vikunja/vikunja/pull/2577","name":"https://github.com/go-vikunja/vikunja/pull/2577","tags":["x_refsource_MISC"]},{"url":"https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b","name":"https://github.com/go-vikunja/vikunja/commit/6df0d6c8f54b01db6464c42810e40e55f12b481b","tags":["x_refsource_MISC"]},{"url":"https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0","name":"https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0","tags":["x_refsource_MISC"]}],"metrics":[{"cvssV3_1":{"attackComplexity":"LOW","attackVector":"NETWORK","availabilityImpact":"HIGH","baseScore":6.5,"baseSeverity":"MEDIUM","confidentialityImpact":"NONE","integrityImpact":"NONE","privilegesRequired":"LOW","scope":"UNCHANGED","userInteraction":"NONE","vectorString":"CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H","version":"3.1"}}],"problemTypes":[{"descriptions":[{"cweId":"CWE-407","lang":"en","description":"CWE-407: Inefficient Algorithmic Complexity","type":"CWE"}]}],"providerMetadata":{"shortName":"GitHub_M","orgId":"a0819718-46f1-4df5-94e2-005712e83aaa","dateUpdated":"2026-04-10T16:05:57.581Z"},"source":{"advisory":"GHSA-r4fg-73rc-hhh7","discovery":"UNKNOWN"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"timestamp":"2026-04-10T18:27:47.907031Z","id":"CVE-2026-35599","options":[{"Exploitation":"poc"},{"Automatable":"no"},{"Technical Impact":"partial"}],"role":"CISA Coordinator","version":"2.0.3"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-04-10T18:28:29.310Z"}}]}}}