René's URL Explorer Experiment


Title: generate multipart boundary from SecureRandom by alhudz · Pull Request #3429 · OpenFeign/feign · GitHub

Open Graph Title: generate multipart boundary from SecureRandom by alhudz · Pull Request #3429 · OpenFeign/feign

X Title: generate multipart boundary from SecureRandom by alhudz · Pull Request #3429 · OpenFeign/feign

Description: Repro: MultipartBoundaryTest drives MultipartFormContentProcessor.process and reads the boundary back out of the generated Content-Type header; on the current code it equals Long.toHexString(System.currentTimeMillis()) for the millisecond the request was built. Cause: the boundary is derived from the wall clock, so it is low-entropy and guessable. RFC 2046 needs the boundary to never appear in a part, and against attacker-controlled body bytes the only guarantee is that the delimiter is unpredictable. A caller forwarding untrusted data into a field or filename value can embed \r\n-- and inject or truncate parts, which the Content-Disposition escaping in #3417 cannot cover because part bodies are written verbatim. Fix: build the boundary from a shared SecureRandom as 128-bit lowercase hex.

Open Graph Description: Repro: MultipartBoundaryTest drives MultipartFormContentProcessor.process and reads the boundary back out of the generated Content-Type header; on the current code it equals Long.toHexString(System...

X Description: Repro: MultipartBoundaryTest drives MultipartFormContentProcessor.process and reads the boundary back out of the generated Content-Type header; on the current code it equals Long.toHexString(System...

Opengraph URL: https://github.com/OpenFeign/feign/pull/3429

X: @github

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8aac674 generate multipart boundary from SecureRandom alhudz Jun 19, 2026 https://github.com/OpenFeign/feign/pull/3429/commits/8aac6744ae86c16ea263f5af2ddc9ba7b8b39aab
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