fix: Validate CIDR masks in IP configuration

[mukeshr06]

Pull Request

• Report security issues confidentially.
• Any contribution is under this license.

Issue

Closes #10640.

Approach

• Validate a CIDR mask instead of discarding it before IP validation.
• Require decimal digits only and enforce the IPv4 (0–32) and IPv6 (0–128) boundaries.
• Reject empty masks, extra separators, whitespace, fractions, exponent/hex/binary forms, negative masks, and out-of-range masks.
• Add focused regression coverage for malformed masks, valid boundaries, and rejection through the server configuration path.

Tasks

• Add tests

Validation

• Focused CIDR specs: 2 passed
• Full ESLint suite: passed
• Babel build: 197 files compiled successfully

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No actionable comments were generated in the recent review. 🎉

ℹ️ Recent review info

⚙️ Run configuration

Configuration used: Organization UI

Review profile: CHILL

Plan: Pro Plus

Run ID: 9cb79f84-389b-42b2-8b59-905800ec1dbd

📥 Commits

Reviewing files that changed from the base of the PR and between 315e157 and 20a31cb.

📒 Files selected for processing (2)

• spec/index.spec.js
• src/Config.js

Included review availability: Your plan provides up to 10 included reviews per hour; 9 remain after this review.

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📝 Walkthrough

Walkthrough

Config.validateIps now validates CIDR masks for IPv4 and IPv6 addresses. Tests cover malformed masks, startup rejection, and valid boundary masks.

Changes

CIDR validation

Layer / File(s)	Summary
Validate CIDR masks src/Config.js, spec/index.spec.js	Config.validateIps validates CIDR syntax and IP-version-specific limits. Tests cover invalid masks, startup rejection, and valid /0, /32, and /128 masks.

Estimated code review effort: 2 (Simple) | ~10 minutes

Merge Risk: ⚪ Minimal · up to 20a31

The change is limited to CIDR-mask validation and tests, with no identified user or production impact that would block merging; it is merge-ready after normal checks.

🚥 Pre-merge checks | ✅ 7

✅ Passed checks (7 passed)

Check name	Status	Explanation
Docstring Coverage	✅ Passed	No functions found in the changed files to evaluate docstring coverage. Skipping docstring coverage check. Docstring coverage is scoped to functions touched by this diff. Analyzed 0 functions across 2 files.
Linked Issues check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Out of Scope Changes check	✅ Passed	Check skipped because no linked issues were found for this pull request.
Security Check	✅ Passed	The diff only adds bounded CIDR validation before BlockList use; published masterKeyIps IP-spoofing path is unchanged, and no changed code matches a listed vulnerability pattern.
Engage In Review Feedback	✅ Passed	GitHub API shows no review submissions or inline review comments; only automated welcome and review-processing comments exist, so no review feedback required engagement.
Title check	✅ Passed	The title uses the allowed "fix:" prefix and clearly describes CIDR mask validation.
Description check	✅ Passed	The description includes the required issue, approach, and tasks sections, with tests and validation results documented.

✨ Finishing Touches

🧪 Generate unit tests (beta)

• Create PR with unit tests

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