fix(pe3): env lookbehind and singular reference dir - #415
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August 22, 2026 04:20
Two independent PE3 false-positive fixes, both confirmed against the official anthropics/skills repo (mcp-builder): - The .env pattern had no lookbehind, so it matched Python attribute access (self.env, args.env) as if it were a dotenv file reference. Added (?<!\w) so it only fires when .env is not part of an identifier. - _PE3_TOKEN_DOCUMENTATION_DIRS only recognized the plural "references", so the existing OAuth access-token exemption silently failed to apply under a singular reference/ directory (mcp-builder/reference/). Added singular forms for docs/procedures/references/examples/guides. Both fixes verified against the existing test suite for _is_env_file_reference_in_docs and _is_pe3_documentation_example, and new regression tests added for the attribute-access and singular-directory cases, including negative-space tests confirming real credential-theft instructions with the same vocabulary still fire. Closes NVIDIA#406, NVIDIA#407 Signed-off-by: Benedict Kwok <bkwok.oracle@gmail.com>
main's Security fixes (NVIDIA#393) changed PE2-PE5's doc-context suppression from hard-dropping the finding to tagging it contextual-triage / likely-benign-context and keeping it. Update the two new reference-dir tests added in this branch to assert on the tag instead of absence, matching the pattern NVIDIA#393 already applied to the equivalent negated-credential-access test. Signed-off-by: Benedict Kwok <bkwok.oracle@gmail.com>
…d-and-reference-dir Signed-off-by: Benedict Kwok <bkwok.oracle@gmail.com>
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Two independent PE3 false-positive fixes, both confirmed against the official anthropics/skills repo (mcp-builder):
The .env pattern had no lookbehind, so it matched Python attribute access (self.env, args.env) as if it were a dotenv file reference. Added (?<!\w) so it only fires when .env is not part of an identifier.
_PE3_TOKEN_DOCUMENTATION_DIRS only recognized the plural "references", so the existing OAuth access-token exemption silently failed to apply under a singular reference/ directory (mcp-builder/reference/). Added singular forms for docs/procedures/references/examples/guides.
Both fixes verified against the existing test suite for _is_env_file_reference_in_docs and _is_pe3_documentation_example, and new regression tests added for the attribute-access and singular-directory cases, including negative-space tests confirming real credential-theft instructions with the same vocabulary still fire.
Testing
make test(unit + integration): 2218 passed, 31 passed, 0 failedmake lint: cleanmake format: cleanCloses #406
Closes #407