CVE-2026-91979 json
Vikunja before 2.6.0 Denial of Service via Decompression Bomb
published last mo. modified 23d ago also EUVD-2026-78650 , GHSA-w7jp-mf2v-8342 , GO-2026-6756
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.4%
- EPSS 0.4% chance of exploitation in 30 days, percentile 38%
- public exploits
- 0
- none known
Summary
Vikunja before 2.6.0 fails to limit archive expansion during data import, allowing authenticated users to cause denial of service. Attackers can upload highly compressed files that expand to tens of gigabytes in memory and disk, exhausting server resources and crashing the instance.
Patch / fix
- go code.vikunja.io/api 2.6.0
- go-vikunja vikunja 2.6.0
- github.com/go-vikunja/vikunja#3688 pull request
- github.com/go-vikunja/vikunja/releases/tag/v2.6.0 release
Is CVE-2026-91979 in your dependencies? Fencer shows which of your repositories are affected as soon as an advisory lands, and opens the fix as a pull request.
Check with FencerCISA SSVC
- Exploitation
- none
- Automatable
- no
- Technical impact
- partial
- Assessed
- last mo.
Exploit prediction
0.44% chance of exploitation in the next 30 days, higher than 38% of all scored CVEs (FIRST EPSS, 2026-11-11).
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| CNA | 4.0 | 7.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N |
| CNA | 4.0 | 7.1 | CVSS:4.0/AV:N/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X |
Affected packages
| ecosystem | package | affected | fixed in |
|---|---|---|---|
| go | code.vikunja.io/api | <2.6.0 all versions |
2.6.0 |
Affected products
- go-vikunja vikunja
Classification
References
-
github.com
/go-vikunja/vikunja/pull/3688
web
-
github.com
/go-vikunja/vikunja/security/advisories/GHSA-w7jp-mf2v-8342
vendor-advisory, web, advisory
-
vulncheck.com
/advisories/vikunja-before-2.6.0-denial-of-service-via-decompression-bomb
third-party-advisory, web
-
nvd.nist.gov
/vuln/detail/CVE-2026-91979
advisory
-
github.com
/go-vikunja/vikunja
package
-
github.com
/go-vikunja/vikunja/releases/tag/v2.6.0
web
Sources
- CVE List CVE-2026-91979
- GitHub Advisory GHSA-w7jp-mf2v-8342
- NVD CVE-2026-91979
- OSV GO-2026-6756
Fencer Intel keeps one entry per vulnerability: the CVE id wins, then GHSA, and records that alias each other are merged, except that two CVEs always keep separate entries. The same data is available as JSON.
CPEs and fixed versions use Anchore's correction of NVD's data: Added CPE configurations because not yet analyzed by NVD.