CVE-2026-27816: EVerest's ISO15118 update_energy_transfer_modes overflow can corrupt EVSE state

Severity: critical (CVSS 9.1 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2026-03-26 · updated 2026-06-17
Weakness: CWE-787

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.

Affected products

everest-core: before 2026.02.0 — fixed in 2026.02.0

How to fix

Upgrade to a fixed version: everest-core 2026.02.0. Check the vendor advisory for mitigations.

References

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

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