PatchTheCVECVE-2026-29955: The `/registercrd` endpoint in KubePlus 4.14 in the kubeconfiggenerator component is vulnerable to command inj
CVE-2026-29955 is a high-severity flaw (CVSS 8.8) affecting kubeplus. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.
The `/registercrd` endpoint in KubePlus 4.14 in the kubeconfiggenerator component is vulnerable to command injection. The component uses `subprocess.Popen()` with `shell=True` parameter to execute shell commands, and the user-supplied `chartName` parameter is directly concatenated into the command string without any sanitization or validation. An attacker can inject arbitrary shell commands by crafting a malicious `chartName` parameter value.
Why this priority
- High severity
- Public exploit reference
A fixed release or distro patch exists.
Risk facts
| CVSS score | 8.8 (High) |
| Attack vector | Network (remote) |
| Attack complexity | Low |
| Privileges needed | Low |
| User interaction | None |
| EPSS exploit chance | 2.2% (top 18%) |
| CISA exploited list | No |
| Weakness | CWE-94 |
| Published | 2026-04-13 |
| Last modified | 2026-06-17 |
Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score
Am I affected?
Timeline
- Published CVE record published
- Updated Record last modified
Exact fixes by distribution
Public exploits and detection
Public code exists for this CVE. Treat unpatched systems as at risk, and only run PoCs in a lab.
- GitHub PoC: b0b0haha/CVE-2026-29955 (0 stars)
- Write-up: gist.github.com/b0b0haha/f011fdd69adc3ae272a4e3b99af90163
- Write-up: github.com/b0b0haha/CVE-2026-29955/blob/main/README.md
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-2026-29955?
kubeplus: upgrade to newer than 4.2.0. Exact commands for each OS are on this page.
Is CVE-2026-29955 being exploited?
CVE-2026-29955 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-2026-29955 affect?
CVE-2026-29955 affects kubeplus. Severity is high (CVSS 8.8). The `/registercrd` endpoint in KubePlus 4.14 in the kubeconfiggenerator component is vulnerable to command injection. The component uses `subprocess.Popen()` with `shell=True` parameter to execute shell commands, and the user-supplied `char
How urgent is CVE-2026-29955?
Priority 56/100. High severity; Public exploit reference
Related CVEs
- CVE-2026-29954 HIGH 7.6 DOWNGRADE In KubePlus 4.1.4, the mutating webhook and kubeconfiggenerator components have an SSRF vulnerability when pro