CVE-2026-35599: Vikunja is an open-source self-hosted task management platform

Q: How do I fix CVE-2026-35599?

vikunja: upgrade to 2.3.0. Exact commands for each OS are on this page.

Q: Is CVE-2026-35599 being exploited?

CVE-2026-35599 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-35599 affect?

CVE-2026-35599 affects vikunja. Severity is medium (CVSS 6.5). 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

Q: How urgent is CVE-2026-35599?

Priority 35/100. Public exploit reference

Routine

MEDIUM 6.5UPGRADE

CVE-2026-35599 is a medium-severity flaw (CVSS 6.5) affecting vikunja. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 vulnerabil

Why this priority

Public exploit reference

A fixed release or distro patch exists.

Risk facts

CVSS score	6.5 (Medium)
Attack vector	Network (remote)
Attack complexity	Low
Privileges needed	Low
User interaction	None
EPSS exploit chance	0.3% (top 72%)
CISA exploited list	No
Weakness	CWE-407
Published	2026-04-10
Last modified	2026-10-26

Publisher (CNA): GitHub, Inc. · Vendor: vikunja

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-10 17:17 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

vikunja vikunja UPGRADE

Affected: < 2.3.0

Fixed in: 2.3.0

Safe to downgrade to: no unaffected older release

1. Check installed version

apt-cache policy vikunja || rpm -q vikunja || vikunja --version

2. UPGRADE to 2.3.0 (Debian / Ubuntu)

sudo apt update && sudo apt install --only-upgrade vikunja

2. UPGRADE (RHEL / Amazon Linux / Fedora)

sudo dnf upgrade vikunja

Note

Distros often backport fixes without changing the version number. Confirm with the distro advisory or changelog.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-35599?

vikunja: upgrade to 2.3.0. Exact commands for each OS are on this page.

Is CVE-2026-35599 being exploited?

CVE-2026-35599 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-35599 affect?

CVE-2026-35599 affects vikunja. Severity is medium (CVSS 6.5). 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

How urgent is CVE-2026-35599?

Priority 35/100. Public exploit reference

Related CVEs

CVE-2026-35597 MEDIUM 5.9 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35596 MEDIUM 4.3 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35594 MEDIUM 6.5 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35595 HIGH 8.3 UPGRADE Vikunja is an open-source self-hosted task management platform
CVE-2026-35602 MEDIUM 5.4 UPGRADE Vikunja is an open-source self-hosted task management platform

References

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