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Issue title

Server-Side Request Forgery (SSRF) — outbound HTTP from user input

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Top 5 (default)
Severity Rule Title File:line
HIGH SEC033 [SEC033] Prototype Pollution — unfiltered merge of user object: Merging user-controlled o… ktor-utils/web/src/io/ktor/util/Crypto.…:92
HIGH SEC029 [SEC029] Server-Side Request Forgery (SSRF) — outbound HTTP from user input: Outbound HTT… ktor-http/common/src/io/ktor/http/Url.kt:286
HIGH SEC029 [SEC029] Server-Side Request Forgery (SSRF) — outbound HTTP from user input: Outbound HTT… ktor-http/common/src/io/ktor/http/URLUt…:15
HIGH SEC029 [SEC029] Server-Side Request Forgery (SSRF) — outbound HTTP from user input: Outbound HTT… ktor-http/jvm/src/io/ktor/http/URLUtils…:73
Reset to top 5 4 findings available (after auto-suppression of test files + won't-fix)

Issue body (markdown)

## Code-quality scan: `ktorio/ktor`

**Score: 80/100 (B+)**  ·  6 findings  ·  scanned 2026-05-16 12:50 UTC  ·  268,264 LOC

| Severity | Count |
|---|---|
| CRITICAL | 0 |
| HIGH | 4 |
| MEDIUM | 0 |
| LOW | 0 |

📊 [Full filterable report](https://repobility.com/scan/22fc017d-6749-4816-b755-890e1e4d383d/)  ·  ![scorecard](https://repobility.com/scan/22fc017d-6749-4816-b755-890e1e4d383d/report.png?v=1778935833-s2)

### Top findings

1. **HIGH** `SEC033` — Prototype Pollution — unfiltered merge of user object
   `ktor-utils/web/src/io/ktor/util/Crypto.web.kt:92` · CWE-1321
2. **HIGH** `SEC029` — Server-Side Request Forgery (SSRF) — outbound HTTP from user input
   `ktor-http/common/src/io/ktor/http/Url.kt:286` · A10:2021 SSRF
3. **HIGH** `SEC029` — Server-Side Request Forgery (SSRF) — outbound HTTP from user input
   `ktor-http/common/src/io/ktor/http/URLUtils.kt:15` · A10:2021 SSRF
4. **HIGH** `SEC029` — Server-Side Request Forgery (SSRF) — outbound HTTP from user input
   `ktor-http/jvm/src/io/ktor/http/URLUtilsJvm.kt:73` · A10:2021 SSRF

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**Security note**: this issue is public. If any flagged finding is a real, exploitable vulnerability, please redirect to your `SECURITY.md` policy or open a [private security advisory](https://docs.github.com/en/code-security/security-advisories/guidance-on-reporting-and-writing-information-about-vulnerabilities/privately-reporting-a-security-vulnerability) instead. We're happy to close this and re-submit privately.

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