Nuclei Version : 3.3.0
OS : Ubuntu 24.04
Golang Version : 1.22.5

Hi,
Following https://docs.projectdiscovery.io/tools/nuclei/mass-scanning-cli I wanted to do a test using the -ss host-spray option, but I observed intensive use of RAM compared to template-spray.

For my test, I'm using a list of 5000 URLs (urls.txt file)

With the following command, RAM consumption is stable at about 600MB

nuclei -l urls.txt -c 20 -bs 30 -rl 600 -severity high,critical

With the following command, RAM increases progressively until it crashes :

nuclei -l urls.txt -c 20 -bs 30 -rl 600 -severity high,critical -ss host-spray

Note: Using fewer URLs or smaller values for -c, -bs and -rl just “slows down” the rate at which RAM consumption increases.

Following https://github.com/projectdiscovery/utils/tree/main/pprof I've made an export : pprof.zip with the following configuration : (I stopped Nuclei when the RAM reached about 2.5Gb)

export PPROF=1
export MEM_PROFILE_DIR=/tmp/memprofile
export CPU_PROFILE_DIR=/tmp/cpuprofile
export PPROF_TIME=10s
export MEM_PROFILE_RATE=4096

Please let me know if I can add any further information.
Regards,
Jomar