CVE-2026-29905Public exploitNetwork attack vector

Disputed denial of service via malformed image upload

Published Mar 26, 2026 · Updated Mar 26, 2026

Reported denial of service in Kirby CMS through 5.1.4 allows remote authenticated users to disrupt pages via a malformed image upload. The reported path continues image processing after getimagesize() returns false, treating the result as image data and triggering a fatal TypeError during metadata or thumbnail generation. Editor permissions are required, and GitHub withdrew the advisory after determining that the reported behavior is not a vulnerability, leaving applicability disputed.

CVSS severity6.5
Medium
EPSS probability0.45%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Reported denial of service in Kirby CMS through 5.1.4 allows remote authenticated users to disrupt pages via a malformed image upload. The reported path continues image processing after getimagesize() returns false, treating the result as image data and triggering a fatal TypeError during metadata or thumbnail generation. Editor permissions are required, and GitHub withdrew the advisory after determining that the reported behavior is not a vulnerability, leaving applicability disputed.

The record

CVE
CVE-2026-29905
Published
Mar 26, 2026
Updated
Mar 26, 2026
Vendor
Unknown vendor
Product
Unknown product
Classifications
CWE-252, CWE-20, T1499.004
Attack vector
network
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 26, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Affected buildAffected product and version details are unavailable.

What conditions does exploitation require?

Attack vectornetwork
Required privilegesauthenticated

What is affected?

Affected products and versions are unavailable in this record.

Published CVSS scores

6.5CISA-ADPCVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-252Unchecked Return Value
CWE-20Improper Input Validation
T1499.004Application or System Exploitation

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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