fix: upgrade json to 2.21.2 to remediate CVE-2026-71847 (CVSS 8.7 High)

[OMpawar-21]

Summary

• Upgrades json gem from 2.20.0 to 2.21.2 to fix CVE-2026-71847 (SNYK-RUBY-JSON-18599450)
• Bumps SDK patch version 0.10.0 → 0.10.1
• Updates CHANGELOG.md with security entry

Vulnerability Detail

Field	Detail
CVE	CVE-2026-71847
Snyk ID	SNYK-RUBY-JSON-18599450
Type	Use After Free (CWE-416)
Severity	High — CVSS 8.7
Affected	json@2.20.0 via JSON::ResumableParser#partial_value
Fix	Upgrade to json@2.21.2

Attack vector: Feeding truncated streaming JSON with duplicate object keys causes partial_value to dereference a freed input buffer (state.start/cursor/end), crashing the Ruby process.

Test plan

• bundle install — 36 gems installed cleanly
• snyk test — ✅ no vulnerable paths found
• bundle exec rspec — ✅ 169 examples, 0 failures
• Line coverage: 95.32%

🤖 Generated with Claude Code

[snyk-io]

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

Status	Scan Engine	Critical	High	Medium	Low	Total (0)
✅	Open Source Security	0	0	0	0	0 issues
✅	Licenses	0	0	0	0	0 issues
✅	Code Security	0	0	0	0	0 issues

💻 Catch issues earlier using the plugins for VS Code, JetBrains IDEs, Visual Studio, and Eclipse.

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[github-actions]

🔒 Security Scan Results

ℹ️ Note: Only vulnerabilities with available fixes (upgrades or patches) are counted toward thresholds.

Check Type	Count (with fixes)	Without fixes	Threshold	Result
🔴 Critical Severity	0	0	10	✅ Passed
🟠 High Severity	0	0	25	✅ Passed
🟡 Medium Severity	0	0	500	✅ Passed
🔵 Low Severity	0	0	1000	✅ Passed

⏱️ SLA Breach Summary

✅ No SLA breaches detected. All vulnerabilities are within acceptable time thresholds.

Severity	Breaches (with fixes)	Breaches (no fixes)	SLA Threshold (with/no fixes)	Status
🔴 Critical	0	0	15 / 30 days	✅ Passed
🟠 High	0	0	30 / 120 days	✅ Passed
🟡 Medium	0	0	90 / 365 days	✅ Passed
🔵 Low	0	0	180 / 365 days	✅ Passed

✅ BUILD PASSED - All security checks passed

[Copilot]

Pull request overview

This PR updates the SDK to remediate a reported json gem security vulnerability by upgrading the locked json dependency and bumping the SDK patch version, with a corresponding changelog entry.

Changes:

• Bumped SDK version to 0.10.1.
• Updated Gemfile.lock to use json 2.21.2 (from 2.20.0).
• Added a security note for 0.10.1 in CHANGELOG.md.

Reviewed changes

Copilot reviewed 2 out of 3 changed files in this pull request and generated no comments.

File	Description
lib/contentstack/version.rb	Patch version bump to 0.10.1.
Gemfile.lock	Locks json gem to 2.21.2 (with updated checksum).
CHANGELOG.md	Adds 0.10.1 security entry documenting the json upgrade.

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