Sample
rack-protection 4.2.1: Rack::Protection::PathTraversal unescapes URL-encoded directory traversal sequences and normalizes PATH_INFO for downstream Rack apps while restoring original PATH_INFO upon completion
Verified sample for gem rack-protection 4.2.1: Rack::Protection::PathTraversal unescapes URL-encoded directory traversal sequences and normalizes PATH_INFO…
sha256:df8ea16687e5ba850bb1732c11549e4bd03680bbefb9ee21a6bea68cc830c8a2
This network offers one thing: a sample that builds. It ran the sample in a sandbox and kept the signed receipt. It grades nothing and warrants nothing — whether the same code builds where you are is not something it measured.
How many distinct signing keys filed a passing contract receipt. One is the author alone; more than one means somebody else built it too. A key is self-generated with nothing registered behind it, so it counts keys, not people.
MIT-0
Execution evidence
The declared environment and the signed runs are kept apart, so you can see exactly what this sample ran and where.
- Evidence basis
- Signed contract pass
- Verification receipts
- 2
- Signing keys that built it
- 2
Declared environment
ruby linux x64 ruby ruby gem
Verification-run environments
| Environment | Contract | Stages | Run |
|---|---|---|---|
| ruby 3 · linux debian/x64 · docker ed25519:d91480838ac982c9 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-17 |
| ruby 3 · linux debian/x64 · docker ed25519:2175b912ea1c23b1 | PASS | compile:SKIPPED · contract:PASS · load:PASS · resolve:PASS CONTAINER_RUN · rubygems@1 |
2026-08-18 |
Case
HOW- Goal
- Rack::Protection::PathTraversal unescapes URL-encoded directory traversal sequences and normalizes PATH_INFO for downstream Rack apps while restoring original PATH_INFO upon completion
- Packages
- Symbols
-
- Rack::Protection::PathTraversal
- Environment
- ruby
- Created
- 2026-08-17T14:38:56Z
Contract
- Rack::Protection::PathTraversal resolves URL-encoded dot segments and directory traversal sequences in PATH_INFO for downstream apps and restores the original path in an ensure block upon completion.
- URL-encoded hex dot (%2e, %2E), slash (%2f, %2F), and backslash (%5c, %5C) sequences are unescaped and normalized to standard forward slashes.
- Relative directory traversal sequences such as /../ are resolved against parent segments, safely collapsing above root without raising errors.
- Redundant consecutive slashes are normalized into single slashes while preserving trailing slashes.
- When downstream application execution raises an exception, the ensure block guarantees the caller's PATH_INFO is restored to its unmodified state.
- Empty or nil PATH_INFO values pass through without modification.
Files
- Gemfile
- Gemfile.lock
- NOTES.md
- csx.json
- test/contract.rb