CVE-2026-4156: ChargePoint Home Flex OCPP getpreq Stack-based Buffer Overflow Remote Code Execution Vulnerability

Q: How do I fix CVE-2026-4156?

home flex cph50 firmware: upgrade to 5.5.4.22. Exact commands for each OS are on this page.

Q: Is CVE-2026-4156 being exploited?

CVE-2026-4156 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-4156 affect?

CVE-2026-4156 affects home flex cph50 firmware. Severity is high (CVSS 7.5). ChargePoint Home Flex OCPP getpreq Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of ChargePoint Home Flex EV charger

Routine

HIGH 7.5UPGRADE

CVE-2026-4156 is a high-severity flaw (CVSS 7.5) affecting home flex cph50 firmware. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

ChargePoint Home Flex OCPP getpreq Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of ChargePoint Home Flex EV chargers. Authentication is not required to exploit this vulnerability. The specific flaw exists within the handling of OCPP messages. The issue results from the lack of proper validation of the length of user-suppli

Why this priority

High severity

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Adjacent network
Attack complexity	High
Privileges needed	None
User interaction	None
EPSS exploit chance	0.4% (top 64%)
CISA exploited list	No
Weakness	CWE-121
Published	2026-04-11
Last modified	2026-10-26

Publisher (CNA): Zero Day Initiative · Vendor: chargepoint

Last updated 2026-10-26 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-04-11 01:16 UTCPublished CVE record published
2026-10-26 21:10 UTCUpdated Record last modified

chargepoint home flex cph50 firmware UPGRADE

Affected: < 5.5.4.22

Fixed in: 5.5.4.22

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
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-2026-4156?

home flex cph50 firmware: upgrade to 5.5.4.22. Exact commands for each OS are on this page.

Is CVE-2026-4156 being exploited?

CVE-2026-4156 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-2026-4156 affect?

CVE-2026-4156 affects home flex cph50 firmware. Severity is high (CVSS 7.5). ChargePoint Home Flex OCPP getpreq Stack-based Buffer Overflow Remote Code Execution Vulnerability. This vulnerability allows network-adjacent attackers to execute arbitrary code on affected installations of ChargePoint Home Flex EV charger

How urgent is CVE-2026-4156?

Priority 35/100. High severity

Related CVEs

CVE-2026-4157 HIGH 7.5 UPGRADE ChargePoint Home Flex revssh Service Command Injection Remote Code Execution Vulnerability
CVE-2026-4155 HIGH 7.5 UPGRADE ChargePoint Home Flex Inclusion of Sensitive Information in Source Code Information Disclosure Vulnerability

References

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