CVE-2026-29905 json
Withdrawn Advisory: Kirby CMS has Persistent DoS via Malformed Image Upload
published 2026-03-26 7 mo ago modified 2026-09-10 1 mo ago also GHSA-cw7v-45wm-mcf2 , EUVD-2026-16232
- cvss
- 6.5
- version 3.1, CNA
- cisa kev
- Not listed
- not in CISA's catalog
- epss
- 0.5%
- EPSS 0.5% chance of exploitation in 30 days, percentile 40%
- public exploits
- 0
- none known
Summary
Kirby CMS through 5.1.4 allows an authenticated user with 'Editor' permissions to cause a persistent Denial of Service (DoS) via a malformed image upload. The application fails to properly validate the return value of the PHP getimagesize() function. When the system attempts to process this file for metadata or thumbnail generation, it triggers a fatal TypeError.
Patch / fix
CISA SSVC
- Exploitation
- Proof of concept is public
- Automatable
- no
- Technical impact
- partial
- Assessed
- 7 mo ago
Exploit prediction
0.46% chance of exploitation in the next 30 days, higher than 40% of all scored CVEs (FIRST EPSS, 2026-11-08).
Exploits and checks
- drive.google.com https://drive.google.com/file/d/1MwvvSYIwnC8kOIzjycGMQZw4d2K2ef8h/view?usp=sharing referenced PoC, tagged "exploit" by a source, unverified
CVSS scores
| assigned by | version | score | vector |
|---|---|---|---|
| CISA ADP | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| CNA | 3.1 | 6.5 | CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
Classification
References
-
drive.google.com
/file/d/1MwvvSYIwnC8kOIzjycGMQZw4d2K2ef8h/view?usp=sharing
web, exploit
-
github.com
/getkirby/kirby/releases/tag/5.2.0-rc.1
web, product
-
github.com
/Stalin-143/CVE-2026-29905
package, third-party-advisory
-
github.com
/Stalin-143/CVE-2026-29905/security/advisories/GHSA-cw7v-45wm-mcf2
web
-
nvd.nist.gov
/vuln/detail/CVE-2026-29905
advisory
-
github.com
/github/advisory-database/pull/7503
web
Sources
- CVE List CVE-2026-29905
- GitHub Advisory GHSA-cw7v-45wm-mcf2
- NVD CVE-2026-29905
Fencer Vulns 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.