How severe is CVE-2026-35599?

CVE-2026-35599 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.

Is CVE-2026-35599 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-35599?

CVE-2026-35599 affects Vikunja. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-35599?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.

Does CVE-2026-35599 have an EU (EUVD) identifier?

Yes. CVE-2026-35599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21426.

When was CVE-2026-35599 published?

CVE-2026-35599 was published on 2026-04-10 and last updated on 2026-06-17.

CVE-2026-35599

CVE-2026-35599 is a medium-severity vulnerability in Vikunja with a CVSS 3.x base score of 6.5. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-407.

Key facts

Severity: Medium (CVSS 3.x base score 6.5)
EPSS exploit prediction: 0% (27th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-21426
Weakness: CWE-407
Affected product: Vikunja
Published: 2026-04-10
Last modified: 2026-06-17

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.

Frequently asked questions

What is CVE-2026-35599?: 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.
How severe is CVE-2026-35599?: CVE-2026-35599 has a CVSS 3.x base score of 6.5, rated medium severity. It is exploitable over network with low attack complexity, requires low privileges and no user interaction. Impact on confidentiality is none, integrity none, and availability high.
Is CVE-2026-35599 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (27th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-35599?: CVE-2026-35599 affects Vikunja. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-35599?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround.
Does CVE-2026-35599 have an EU (EUVD) identifier?: Yes. CVE-2026-35599 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-21426.
When was CVE-2026-35599 published?: CVE-2026-35599 was published on 2026-04-10 and last updated on 2026-06-17.

References

Affected products (1)

cpe:2.3:a:vikunja:vikunja:*:*:*:*:*:*:*:*

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