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BackendError.original_exception / __cause__ deliberately retains the raw provider exception for programmatic access, and that text can embed the cache key. The SDK never renders it (no logger.exception/exc_info= in src/cachekit/), but application code that logs a caught exception's traceback still can. SECURITY.md now states the boundary and the redact_error_for_log mitigation; no mirrored surface exists on docs.cachekit.io.
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Included review availability: 1 review is currently available. Your included PR review attempts over the past 7 days set your current allowance at 2 reviews per hour. WalkthroughThe cache-key redaction guidance now covers retained provider exceptions and chained causes. It identifies application logging, formatter configuration, and APM or error-tracking handling as possible exposure paths. It recommends redacted exception logging or scrubbing both exception references. ChangesCache-key redaction guidance
Priority: ➖ Normal Estimated code review effort: 1 (Trivial) | ~3 minutes Change: Other Merge Risk: ⚪ Minimal · up to This PR clarifies cache-key redaction guidance without changing runtime behavior, and no merge-blocking risk is identified. 🚥 Pre-merge checks | ✅ 4 | ❌ 1❌ Failed checks (1 warning)
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Full details: Description checkExplanation The description explains the change, motivation, security impact, and documentation-only scope. However, it does not follow the repository template and omits the required Type of Change, Security Checklist, Testing, Backward Compatibility, and Additional Notes sections.
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Inline comments:
In `@SECURITY.md`:
- Around line 192-194: The guidance for submitting BackendError instances to
error trackers must also sanitize or remove BackendError.original_exception, not
only scrub __cause__, because provider exception text may contain the raw cache
key. Update the error-tracking integration to submit a sanitized exception or
otherwise prevent serialization of original_exception while preserving the
existing redacted logging behavior.
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SECURITY.md
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…_cause__ The traceback-scope guidance told operators to scrub `__cause__` before handing a BackendError to an error tracker, but the same paragraph documents that `BackendError.original_exception` also retains the raw provider exception. An error/APM SDK that serialises exception attributes would capture the provider text (and any embedded key) from `original_exception` even with `__cause__` cleared. Widen the guidance to scrub both. CodeRabbit-Resolved: SECURITY.md:194:sanitize or remove BackendError.original_exception
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Inline comments:
In `@SECURITY.md`:
- Around line 192-194: Update the SECURITY.md traceback guarantee to state that
it applies only to internal cachekit.* logging paths, since
application-configured JsonFormatter may render retained provider exceptions
through record.exc_info. Preserve the existing guidance to log
redact_error_for_log(e) or type(e).__name__, and to scrub both __cause__ and
BackendError.original_exception before APM submission.
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SECURITY.md
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…onFormatter The guarantee that "no cachekit.* log line renders a traceback" scopes to cachekit's own logging calls. cachekit also ships JsonFormatter, which renders any supplied record.exc_info via traceback.format_exception — so an application that wires JsonFormatter and logs a BackendError with exc_info renders the chained cause and its raw key, exactly like the other application paths. Note that path explicitly so the guarantee is not read as covering the shipped formatter. CodeRabbit-Resolved: SECURITY.md:194:Qualify the traceback guarantee to internal cachekit logging paths
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Summary
This PR adds documentation to
SECURITY.mdclarifying a gap in the cache key redaction guarantee: application-rendered tracebacks are not covered by cachekit's automatic redaction.What Changed
New scope section on traceback redaction explaining that while cachekit's own loggers never render exception tracebacks,
BackendError.original_exception(and the__cause__chain set viafrom exc) intentionally preserves the original provider exception for programmatic access — and that exception's text may embed the raw cache key (e.g., a pymemcacheMemcacheIllegalInputErrorechoing an oversized key, a redisResponseErrornaming it, or an httpx error carrying the request path).Warns about the uncovered path: if application code catches a
BackendErrorand callslogger.exception(e), setsexc_info=True, callstraceback.format_exc(), or hands the exception to an APM/error-tracking SDK, the rendered traceback will leak the raw key via the chained cause.Provides remediation guidance: log
redact_error_for_log(e)ortype(e).__name__instead of the traceback, or scrub__cause__before handing the exception to an error tracker.Adds a cross-reference in the existing "never log
e.key" caution pointing to this new traceback section.Why
This closes a documentation gap (LAB-3796). cachekit's architecture test enforces that the SDK never emits a traceback, but that guarantee ends at the boundary of application code. Operators need to know that catching cachekit exceptions and rendering them via their own logging or observability tooling can still leak caller-supplied identifiers embedded in cache keys.
Notes
This is a documentation-only change — no code behavior is modified.
Summary
This PR updates
SECURITY.mdto close a documentation gap regarding traceback redaction guidance forBackendErrorexceptions.What Changed
The existing security guidance already warned that application-rendered tracebacks can leak raw cache keys through the chained cause (
__cause__) of aBackendError. This change extends that guidance to also coverBackendError.original_exception.Previously, the docs advised users to "scrub
__cause__before handing it to an error tracker." The updated text now instructs users to scrub both the chained cause (__cause__) andBackendError.original_exceptionbefore passing the exception to an error/APM tracker.Why
The prior guidance was incomplete. Even if
__cause__is cleared, an APM or error-tracking SDK that serializes exception attributes can still capture the raw provider text — and any embedded cache key — fromoriginal_exception. This closes a gap where following the documented scrubbing advice would not fully prevent key leakage.Impact
Summary
This PR updates
SECURITY.mdto document an additional traceback redaction gap involving theJsonFormatterthat cachekit ships (cachekit.logging.JsonFormatter).Details
The existing security documentation already described how application-rendered tracebacks fall outside cachekit's key-redaction guarantee. This change adds an important clarification: the architecture-test guarantee only covers cachekit's own logging calls, not the
JsonFormatterthe SDK ships.The new text explains that:
JsonFormatterrenders whateverrecord.exc_infoa caller supplies viatraceback.format_exception.BackendErrorwithexc_infoset, the formatter will render the chained cause (and any raw key it embeds) — behaving exactly like the other application-side leakage paths already documented.Purpose
This closes a documentation gap (LAB-3796) by warning operators that using cachekit's own
JsonFormatterdoes not automatically redact keys from tracebacks, helping prevent accidental leakage of caller-supplied identifiers ([CWE-532]) in application logs.This is a documentation-only change; no functional code was modified.
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