fix(telemetry): bound processing of prefixed metadata headers - #631
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logMetadata attached each prefixed metadata value with its own WithValues call (O(N^2) slice copies) and both it and passAlongMetadata processed an unbounded number of caller-supplied headers before authorization. A flood of headers could therefore exhaust CPU/memory and spam the audit log. Collect prefixed pairs once, cap the pair count and per-value length, and attach/forward them in a single call. Adds a unit test for the bounds. Co-authored-by: Cursor <cursoragent@cursor.com>
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sfc-gh-mjankowski
approved these changes
Aug 10, 2026
sfc-gh-ikryvanos
enabled auto-merge (squash)
August 27, 2026 09:41
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logMetadata attached each prefixed metadata value with its own WithValues call (O(N^2) slice copies) and both it and passAlongMetadata processed an unbounded number of caller-supplied headers before authorization. A flood of headers could therefore exhaust CPU/memory and spam the audit log.
Collect prefixed pairs once, cap the pair count and per-value length, and attach/forward them in a single call. Adds a unit test for the bounds.