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🛡️ Sentinel: [CRITICAL] Fix uppercase header causing axum panic - #20

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sentinel-fix-uppercase-header-panic-17015758347346998702
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🛡️ Sentinel: [CRITICAL] Fix uppercase header causing axum panic#20
google-labs-jules[bot] wants to merge 2 commits into
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sentinel-fix-uppercase-header-panic-17015758347346998702

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Fixes a critical vulnerability where an uppercase header name (X-Total-Count) passed to axum::http::HeaderMap::insert() caused a panic during string-to-header name conversion. HTTP header names must be lowercase. This commit changes the header to x-total-count and leaves a cautionary comment.


PR created automatically by Jules for task 17015758347346998702 started by @euxaristia

Uppercase header names in `axum` cause panics during `IntoHeaderName`
conversions, functioning as a localized DoS vulnerability. This commit
changes `"X-Total-Count"` to the lowercase `"x-total-count"` to prevent
axum panics on the `list_repos` route.

Also added a comment explicitly warning against using uppercase letters
in custom headers.
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Thanks for the contribution. A couple of things will help us review this faster:

  • Link the issue this addresses (Closes #123). For protocol changes, open an issue first.
  • This changes Rust source but no tests changed. Tests are required for fixes and strongly encouraged for features.

See CONTRIBUTING.md. Update the PR and these notes will clear automatically.

Uppercase header names in `axum` cause panics during `IntoHeaderName`
conversions, functioning as a localized DoS vulnerability. This commit
changes `"X-Total-Count"` to the lowercase `"x-total-count"` to prevent
axum panics on the `list_repos` route.

Also ran `cargo update -p h2` to resolve a cargo audit failure (RUSTSEC-2026-0258)
in the CI pipeline.
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