Vulnerability · Published Apr 10, 2026 · Assigned by GitHub_M

CVE-2026-35602Vikunja has a File Size Limit Bypass via Vikunja Import

Medium 5.4

In plain English

A medium-severity resource allocation without limits in vikunja from go-vikunja. Proof-of-concept exploit code is public. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 27% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)5.4Medium

Exploit odds (30 days)0.3%top 72.7% of all CVEs

Exploited in the wildNo reportsCISA SSVC: poc

Attack toolingNoneno public tooling known

Official description

Vikunja is an open-source self-hosted task management platform. Prior to 2.3.0, the Vikunja file import endpoint uses the attacker-controlled Size field from the JSON metadata inside the import zip instead of the actual decompressed file content length for the file size enforcement check. By setting Size to 0 in the JSON while including large compressed file entries in the zip, an attacker bypasses the configured maximum file size limit. This vulnerability is fixed in 2.3.0.

Affected packages & fixed versions

Ecosystem	Package	Fixed in	Advisory
Go	code.vikunja.io/api	2.3.0	GHSA-qh78-rvg3-cv54
Go	code.vikunja.io/api	no fix listed	GO-2026-5582

Affected products (as reported)

Vendor	Product	Versions
go-vikunja	vikunja	< 2.3.0

Weakness: CWE-770 · Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:L/A:L

References

https://github.com/go-vikunja/vikunja/security/advisories/GHSA-qh78-rvg3-cv54 x_refsource_CONFIRM
https://github.com/go-vikunja/vikunja/pull/2575 x_refsource_MISC
https://github.com/go-vikunja/vikunja/releases/tag/v2.3.0 x_refsource_MISC