Composer memory limit exhausted
Fix 'PHP Fatal error: Allowed memory size exhausted' during composer install. Update vulnerable PHP packages without memory issues.
⚠ Error Message
PHP Fatal error: Allowed memory size of 1610612736 bytes exhausted (tried to allocate 4096 bytes)
Root Cause
Composer's dependency resolver requires large amounts of memory for complex dependency graphs, especially when resolving conflicts across many packages.
How to Fix
- Run COMPOSER_MEMORY_LIMIT=-1 composer install to remove the memory limit.
- Or increase PHP memory: php -d memory_limit=2G /usr/local/bin/composer install
- Paste your composer.json into PackageFix to identify CVEs first — then update only vulnerable packages.
- Use composer update --no-scripts to skip resource-intensive post-install scripts.
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Frequently Asked Questions
How do I fix Composer memory exhausted on CI?
Set COMPOSER_MEMORY_LIMIT=-1 in your CI environment variables. Most CI systems allow this as an env var.
Why does Composer use so much memory?
Composer loads all package metadata into memory during dependency resolution. Large projects with many packages and conflicts require more memory.
How do I update only security-critical PHP packages?
Use composer update to update a specific package. PackageFix shows which packages have CVEs so you can target updates precisely.
Does this error mean my packages are vulnerable?
Not necessarily — it's a resource error, not a security error. But run PackageFix on your composer.json to check for CVEs independently.