[spark-compete] fix(ssrf): add URL validation to DuckDuckGo redirect following (CWE-918)

[ifeoluwaaj]

spark-compete Packet

"evidence.forbidden": [
"no hardcoded secrets or credentials",
"no eval() or exec() calls",
"no shell injection vectors",
"no unsafe deserialization",
"no path traversal in new code",
"no network calls added"
]

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  "submission_target_url": "https://github.com/vibeforge1111/spark-character/pull/167",
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    "source": "https://github.com/vibeforge1111/spark-character",
    "owner_surface": "spark-character"
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  "issue": {
    "type": "bug",
    "severity": "MEDIUM",
    "title": "fix(ssrf): add URL validation to DuckDuckGo redirect following (CWE-918)",
    "actual_behavior": "Before fix: return unquote(qs[\"uddg\"][0])",
    "expected_behavior": "After fix: if scheme not in (\"http\", \"https\", \"\"):",
    "repro_steps": [
      "gh pr checkout 167",
      "Check the PR diff for specific details",
      "Verify the fix in changed files"
    ],
    "affected_workflow": "Code path in spark-character",
    "impact_score": 22
  },
  "evidence": {
    "safe_links_only": true,
    "before_after_proof": "Before: Before fix: return unquote(qs[\"uddg\"][0]). After: After fix: if scheme not in (\"http\", \"https\", \"\"):.",
    "links": [
      "https://github.com/vibeforge1111/spark-character/pull/167"
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      "ci_passing": 0,
      "ci_failing": 0,
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  "proposed_fix": {
    "approach": "Modified src/ to fix the identified bug",
    "files_expected": [
      "src/spark_character/search_adapter.py"
    ],
    "files_count": 1,
    "tests_or_smoke": "pytest tests/ -v",
    "backward_compatible": true,
    "breaking_changes": []
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  "pr": {
    "branch": "hotfix/ssrf-duckduckgo-redirect-20260604163953",
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    "url": "https://github.com/vibeforge1111/spark-character/pull/167"
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    "duplicate_notes": "Searched spark-character PRs for similar fixes to src/. No duplicates found.",
    "review_state_requested": "pr_review",
    "risk_notes": "Changes to src/ in spark-character. Low risk, reviewers verify edge cases."
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  "metadata": {
    "format_version": "hotfix-v1",
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}

Bug Summary

[spark-compete] fix(ssrf): add URL validation to DuckDuckGo redirect following (CWE-918)

Severity: MEDIUM

Expected: Code should function correctly after the fix.

Root Cause

Bug identified through code analysis. See PR diff for specific code references.

Team: Sequence

Role	Username	GitHub	Device
LLM Device Holder	@ifesn	ifeoluwaaj	VPS
Member	@micc9ee	micc9ee	-
Member	@londitshabalala	londitshabalala	-
def _is_safe_url(url: str) -> bool:

## Before (The Bug)

See PR diff for original code.

## After (The Fix)

```python
def _is_safe_url(url: str) -> bool:
    """Check whether a URL is safe to fetch (CWE-918 SSRF guard).

Testing

• Code compiles without errors
• Existing test suite passes
• Manual verification: fix(ssrf): add URL validation to DuckDuckGo redirect following (CWE-918)

Files Changed

File	Change Summary
src/spark_character/search_adapter.py	Modified Python file
src/spark_character/search_adapter.py	Modified Python file

Risk Notes

• Surface changed: src/spark_character/search_adapter.py
• Risk level: Low - minimal code changes
• Reviewers should verify: Fix handles edge cases correctly

Duplicate Notes

• Searched spark-character - no existing fixes found
• Fix for: fix(ssrf): add URL validation to DuckDuckGo redirect following (CWE-918)