How severe is CVE-2026-27816?

CVE-2026-27816 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.

Is CVE-2026-27816 being actively exploited?

It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.

What products are affected by CVE-2026-27816?

CVE-2026-27816 affects Linuxfoundation Everest. See the affected-products list for the exact vulnerable versions.

How do I fix CVE-2026-27816?

Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.

Does CVE-2026-27816 have an EU (EUVD) identifier?

Yes. CVE-2026-27816 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16226.

When was CVE-2026-27816 published?

CVE-2026-27816 was published on 2026-03-26 and last updated on 2026-06-17.

CVE-2026-27816

CVE-2026-27816 is a critical-severity vulnerability in Linuxfoundation Everest with a CVSS 3.x base score of 9.1. It is not currently listed as actively exploited by CISA, and its EPSS exploit-prediction score is low. The underlying weakness is classified as CWE-787.

Key facts

Severity: Critical (CVSS 3.x base score 9.1)
CVSS v4: 5.5
EPSS exploit prediction: 0% (10th percentile)
Actively exploited: Not listed in CISA KEV
EU (EUVD) id: EUVD-2026-16226
Weakness: CWE-787
Affected product: Linuxfoundation Everest
Published: 2026-03-26
Last modified: 2026-06-17

Description

EVerest is an EV charging software stack. Prior to versions to 2026.02.0, ISO15118_chargerImpl::handle_update_energy_transfer_modes copies a variable-length list into a fixed-size array of length 6 without bounds checking. With schema validation disabled by default, oversized MQTT Cmd payloads can trigger out-of-bounds writes and corrupt adjacent EVSE state or crash the process. Version 2026.02.0 contains a patch.

Frequently asked questions

What is CVE-2026-27816?: EVerest is an EV charging software stack. Prior to versions to 2026.02.0, ISO15118_chargerImpl::handle_update_energy_transfer_modes copies a variable-length list into a fixed-size array of length 6 without bounds checking. With schema validation disabled by default, oversized MQTT Cmd payloads can trigger out-of-bounds writes and corrupt adjacent EVSE state or crash the process. Version 2026.02.0 contains a patch.
How severe is CVE-2026-27816?: CVE-2026-27816 has a CVSS 3.x base score of 9.1, rated critical severity. It is exploitable over network with low attack complexity, requires no privileges and no user interaction. Impact on confidentiality is none, integrity high, and availability high.
Is CVE-2026-27816 being actively exploited?: It is not currently listed in CISA's KEV catalog. Its EPSS exploit-prediction score is 0% (10th percentile), an estimate of the probability of exploitation in the next 30 days.
What products are affected by CVE-2026-27816?: CVE-2026-27816 affects Linuxfoundation Everest. See the affected-products list for the exact vulnerable versions.
How do I fix CVE-2026-27816?: Review the linked vendor and NVD advisories for patched versions and mitigations, then upgrade or apply the recommended workaround. Given its critical severity, prioritise patching exposed systems.
Does CVE-2026-27816 have an EU (EUVD) identifier?: Yes. CVE-2026-27816 is tracked in the ENISA EU Vulnerability Database (EUVD) as EUVD-2026-16226.
When was CVE-2026-27816 published?: CVE-2026-27816 was published on 2026-03-26 and last updated on 2026-06-17.

References

https://github.com/EVerest/EVerest/security/advisories/GHSA-gq54-j8f4-xj8c

Affected products (1)

cpe:2.3:o:linuxfoundation:everest:*:*:*:*:*:*:*:*

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