[Snyk] Fix for 4 vulnerabilities

[maidul98]

Snyk has created this PR to fix 4 vulnerabilities in the npm dependencies of this project.

Snyk changed the following file(s):

• backend/package.json
• backend/package-lock.json

Vulnerabilities that will be fixed with an upgrade:

	Issue	Score
	Interpretation Conflict SNYK-JS-FASTIFY-15182642	828
	Uncaught Exception SNYK-JS-FASTXMLPARSER-15155603	828
	Allocation of Resources Without Limits or Throttling SNYK-JS-FASTIFY-15182641	601
	Directory Traversal SNYK-JS-TAR-15127355	596

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🦉 Allocation of Resources Without Limits or Throttling
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🦉 Directory Traversal

[maidul98]

✅ Snyk checks have passed. No issues have been found so far.

Status	Scanner	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues

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[greptile-apps]

Greptile Overview

Greptile Summary

This PR upgrades 5 npm dependencies to address 4 security vulnerabilities (2 high severity, 2 medium severity):

Key Changes:

• fastify: 4.29.1 → 5.7.3 (major upgrade) - Fixes Interpretation Conflict and Resource Allocation vulnerabilities
• bcrypt: 5.1.1 → 6.0.0 (major upgrade) - Transitive dependency update
• argon2: 0.31.2 → 0.40.1 (major upgrade) - Transitive dependency update
• @aws-sdk/client-route-53: 3.810.0 → 3.894.0 (minor) - Includes fast-xml-parser upgrade to fix Uncaught Exception vulnerability
• re2: 1.21.4 → 1.21.5 (patch) - Includes tar upgrade to fix Directory Traversal vulnerability

Security Impact:

• Fixes SNYK-JS-FASTIFY-15182642 (score 828) - Interpretation Conflict
• Fixes SNYK-JS-FASTXMLPARSER-15155603 (score 828) - Uncaught Exception
• Fixes SNYK-JS-FASTIFY-15182641 (score 601) - Resource Allocation Without Limits
• Fixes SNYK-JS-TAR-15127355 (score 596) - Directory Traversal

Breaking Change Concerns:
The PR metadata indicates "isBreakingChange":true. The major version upgrades (fastify, bcrypt, argon2) require thorough testing:

• Fastify v5 may have plugin compatibility issues - verify all @fastify/* plugins and custom plugins work correctly
• Bcrypt v6 must maintain backward compatibility with existing password hashes (used in backend/src/lib/crypto/cryptography/crypto.ts)
• Argon2 v0.40 must preserve hash compatibility for SRP authentication flows and secret blind indexing (used in backend/src/lib/crypto/srp.ts and backend/src/lib/crypto/encryption.ts)

Confidence Score: 3/5

• This PR is safe to merge after thorough testing of authentication flows and fastify compatibility
• The security vulnerabilities are legitimate and need fixing, but the major version upgrades (fastify 4→5, bcrypt 5→6, argon2 0.31→0.40) introduce breaking change risk. The score reflects: (1) Valid security improvements, (2) Potential breaking changes requiring verification, (3) Need for comprehensive testing of authentication and server initialization before production deployment
• Pay close attention to authentication flows and fastify plugin compatibility. Test backend/src/lib/crypto/srp.ts, backend/src/lib/crypto/cryptography/crypto.ts, and backend/src/server/app.ts thoroughly

Important Files Changed

Filename	Overview
backend/package.json	Upgrades 5 dependencies: @aws-sdk/client-route-53 (3.810.0→3.894.0), argon2 (0.31.2→0.40.1), bcrypt (5.1.1→6.0.0 - major), fastify (4.29.1→5.7.3 - major), re2 (1.21.4→1.21.5) to fix 4 vulnerabilities
backend/package-lock.json	Lockfile updates reflecting dependency upgrades with cascading transitive dependency changes from major version upgrades

[greptile-apps]

_{2 files reviewed, 3 comments}

_{Edit Code Review Agent Settings | Greptile}

[greptile-apps]

Fastify 4→5 is a major version upgrade. Check that all fastify plugins are compatible with v5. The PR metadata indicates "isBreakingChange":true, so verify:

• All @fastify/* plugins support v5
• Custom fastify plugins use v5-compatible APIs
• Test the application thoroughly before deploying

[greptile-apps]

Bcrypt major version upgrade (5→6). Verify existing password hashes remain compatible with bcrypt v6's verification. Test authentication flows with existing user credentials before deploying to production.

[greptile-apps]

Argon2 major version upgrade (0.31→0.40). This library is used in SRP key generation (backend/src/lib/crypto/srp.ts) and blind indexing. Test that:

• Existing user SRP keys can still be verified
• Secret blind indexes work correctly
• The raw: true output format hasn't changed