Vulnerability · Published Mar 26, 2026 · Assigned by GitHub_M

CVE-2026-27815EVerest: ISO15118 session_setup payment options overflow can corrupt EVSE state

Medium 5.5

In plain English

A medium-severity out-of-bounds write in everest-core from EVerest. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.3% (higher than 21% of all known vulnerabilities).

Severity (CVSS 4.0)5.5Medium

Exploit odds (30 days)0.3%top 79.1% of all CVEs

Exploited in the wildNo reportsCISA SSVC: none

Attack toolingNoneno public tooling known

Official description

EVerest is an EV charging software stack. Prior to versions to 2026.02.0, ISO15118_chargerImpl::handle_session_setup copies a variable-length payment_options list into a fixed-size array of length 2 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 (as reported)

Vendor	Product	Versions
EVerest	everest-core	< 2026.02.0

Weakness: CWE-787 · Vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:P

References

https://github.com/EVerest/EVerest/security/advisories/GHSA-7wmg-crc8-6xxf x_refsource_CONFIRM