ProjectDiscovery Nuclei 3 before 3.8.0 allows DSL expression injection. This affects use of -env-vars for multi-step templates against untrusted targets (not the default configuration).
https://github.com/projectdiscovery/nuclei/security/advisories/GHSA-jm34-66cf-qpvr
https://github.com/projectdiscovery/nuclei/pull/7321
https://github.com/projectdiscovery/nuclei/pull/7221
https://github.com/projectdiscovery/nuclei/commit/d2217320162d5782ca7cb95bef9dda17063818f3
https://github.com/projectdiscovery/nuclei/commit/6c803c74d193f85f8a6d9803ce493fd302cad0eb