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Fix route parameter redaction when the value contains the following literal - #7828
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evgenyfedorov2 merged 6 commits intoOct 13, 2026
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…iteral
HttpRouteFormatter split a parameter value at the first occurrence of the next
literal's first char, and HttpRouteParser took the whole path segment, so values
of routes like {token}.{format} were split incorrectly and parts of a sensitive
value could be logged unredacted. Match the literals that follow a parameter in
the same path segment from right to left, as ASP.NET Core routing does.
Fixes #7826
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
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🟡 Changes recommended
Case-sensitive literal matching can still expose classified values when route and path casing differ.
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What changed in this PR
Fixes route-parameter extraction and redaction for complex path segments by matching trailing literals right-to-left.
Changes:
- Adds shared complex-segment matching logic.
- Updates parser and formatter behavior.
- Adds regression tests.
| File | Description |
|---|---|
HttpRouteParser.cs |
Implements shared literal matching. |
HttpRouteFormatter.cs |
Uses improved parameter boundaries. |
HttpParserTests.cs |
Tests extraction scenarios. |
HttpRouteFormatterTests.cs |
Tests complete redaction. |
🧠 Review effort: Balanced
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Collaborator
🎉 Good job! The coverage increased 🎉
Full code coverage report: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1632045&view=codecoverage-tab |
ASP.NET Core routing ignores case when matching literals, so a request such as
/a/part1.part2.json.ZIP matches route /a/{token}.{format}.zip. The ordinal match
returned -1 for it and both callers fell back to their old splitting, which
leaked part of the token.
Co-authored-by: Copilot App <223556219+Copilot@users.noreply.github.com>
Collaborator
🎉 Good job! The coverage increased 🎉
Full code coverage report: https://dev.azure.com/dnceng-public/public/_build/results?buildId=1632132&view=codecoverage-tab |
dariusclay
approved these changes
Oct 13, 2026
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Fixes #7826
For a route parameter followed by a literal in the same path segment, e.g.
{token}.{format}:HttpRouteFormattersplit the value at the first occurrence of the next literal's first char:/a/{token}.{format}+/a/part1.part2.part3.json→a/[REDACTED].part2.part3.json.HttpRouteParsertook the whole path segment:/b/{format}.{token}+/b/json.secret→format=json.secret,token="".Fix: match the literals that follow the parameter within the same path segment from right to left, ignoring case, as ASP.NET Core routing does (one small helper used by both). If they can't be matched, the previous logic is used unchanged.
Added tests for the cases above; they fail without the fix.
Microsoft Reviewers: Open in CodeFlow