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codeql: repaired SARIF gate now blocks every PR on a false-positive URL-sanitization finding in a contract test #2208
Description
Symptom
codeql-dispatch/python fails with "CodeQL dispatch scan found unsuppressed Medium+ findings" on .github PR #2191 (run 34858661909, job 104164445171):
CODEQL_SARIF files=1 results=1 medium_plus=1
CODEQL_FINDING rule=py/incomplete-url-substring-sanitization security-severity=7.8
path=tests/test_organization_commercial_readiness_loop_receipt_contract.py line=43
message=The string [results-receiver.actions.githubusercontent.com:443](1) may be at an arbitrary position in the sanitized URL.
The flagged line is a contract assertion over workflow source text, not URL handling:
assert "results-receiver.actions.githubusercontent.com:443" in sourcesource is the read-in text of a workflow file; the assertion pins one harden-runner egress allowlist entry. Nothing here sanitizes or validates a URL, so this is a false positive as a security finding while being a correct match for the query's syntactic heuristic.
Why it started now — and why it will affect every PR
This is a direct, expected consequence of the #2150 repair (merged as #2155, d1d70e334, 2026-09-14 01:03Z). Before it, gather_findings resolved rules only against tool.driver.rules; the Python CodeQL artifact carries 0 driver rules and 43 rules in the codeql/python-queries extension, so every result scored None and the gate reported medium_plus=0 — fail-open. The repaired gate resolves the referenced tool component, so it now sees security-severity=7.8 and blocks, exactly as that PR's description said it would.
The finding is in a file on main, unmodified by the PR that surfaced it, so every PR scanned from now on hits it. #2060 currently shows codeql-dispatch/python=pass, but that is stale evidence: it was scanned before the repair landed.
Scan configuration is not the cause and has not regressed: codeql-scan-dispatch.yml:412-422 passes only languages/build-mode to codeql-action/init and category/upload/output to analyze. There is no config file, no paths-ignore, and no query-suite override anywhere in the repository, so the default suite runs over the whole tree including tests/.
This is not bypass-eligible
Per the governance rule, the infrastructure exception covers CI/runner/workflow failures. This is a content finding produced by a correctly functioning gate. It must be resolved on its merits, not merged around — even though I assess the finding itself to be a false positive, that assessment should be reviewed rather than self-applied.
Remediation options
- Rewrite the assertion so it is not a substring test. Compare against parsed allowlist entries (membership in a sequence) instead of
in source. Preserves the exact-string contract; removes the heuristic match. Narrowest change, no new mechanism. - Scope the scan. Add a CodeQL config with
paths-ignorefortests/, or a query-suite selection. Broadest effect, needs its own justification: it would stop scanning test code repository-wide. - Suppress the single finding. The repository currently uses no
# codeql[...]/# lgtm[...]suppression anywhere, so this would introduce a new convention; per the warning-handling rule a suppression needs an owner, a justification, and a review date, and is the least preferred of the three.
Option 1 looks right to me, but the file is tests/test_organization_commercial_readiness_loop_receipt_contract.py and I am not its writer, so I am not taking it.
Notes for whoever picks this up
- Lines 44-45 use the same
in sourceshape (*.actions.githubusercontent.com:443,*.blob.core.windows.net:443) and were not flagged — the leading*.stops the hostname heuristic. Only line 43 needs changing. - The same rule produced the two DOI-substring findings recorded on fast-mlsirm#1838, so this pattern recurs across the organization; a fix here does not generalize on its own.
- Zero open PRs currently touch the flagged file, so the lane is free.
Filed from PR #2191, whose own diff is one unrelated test file.
Activity
seonghobae commentedon Sep 15, 2026
Opened #2209 with a repair of the assertion rather than a suppression.
The query's shape complaint holds up under test:
"results-receiver.actions.githubusercontent.com:443" in sourcealso matchesevil-results-receiver.actions.githubusercontent.com:443, so the old contract stayed green while the endpoint the artifact upload needs was absent from the allowlist. #2209 asserts the three endpoints as whole stripped lines instead, which fails that substitution and drops the Medium+ result at the same time. No gate, query-filter, or pragma change.Verified locally: target test 2 passed; RED check with the tampered allowlist line fails as intended;
pytest -k organization_commercial_readiness37 passed;interrogate100%.Leaving this issue open until #2209 lands and a current-head
codeql-dispatch/pythoncomes back clean.seonghobae commentedon Sep 16, 2026
Verified on the hosted gate: the finding is gone.
Dispatch run 34994237669 for
#2209@10453addf, jobCodeQL dispatch scan (python)(104548927206) concluded success with every step green:results=0— not merelymedium_plus=0. Before #2209 the same scan on#2186@02077429dreportedfiles=1 results=1 medium_plus=1with thepy/incomplete-url-substring-sanitizationhit at line 43 of that contract test. Rewriting the three endpoint assertions as whole stripped lines removes the result itself, so there is nothing left for the repaired gate to score.Sibling note for #2141, not for this issue: in the same dispatch run the
actionsshard also passed its Medium+ gate (Enforce CodeQL Medium+ SARIF gate -> success) but concluded failure atWake exact CodeQL required job. That red is the wake coupling, unrelated to this finding.The required
CodeQL compatibility analysis (python)job on #2209 is now re-running off this verdict. Suggest closing once #2209 merges.seonghobae commentedon Sep 17, 2026
Triage (2026-09-18): Ranked #2 in org CI/security backlog (#2251). Recommended next action: implement (CodeQL contract-test URL-sanitization FP). Related open mentions
#2191/#2209do not currently close this issue.seonghobae commentedon Sep 18, 2026
Closing — fixed on
mainvia #2234 (supersedes #2209)Verified against protected
main(not PR titles alone):origin/mainno longer contains the bare hostname substring assert that CodeQL flagged.tests/test_organization_commercial_readiness_loop_receipt_contract.pynow parses harden-runnerallowed-endpointsvia_harden_runner_allowed_endpointsand asserts exact membership (results-receiver.actions.githubusercontent.com:443in endpoints, notin source). Confirmed withgit show origin/main:…andgit grep -F '_harden_runner_allowed_endpoints' origin/main.7d496d626(fix(codeql): stop SARIF false positive and wake-only verdict inversion), merged as fix(codeql): stop SARIF false positive and wake-only verdict inversion #2234 on 2026-09-17. Commit message explicitly cites codeql: repaired SARIF gate now blocks every PR on a false-positive URL-sanitization finding in a contract test #2208.Residual (not this issue): open PRs whose exact heads still predate that commit (e.g. Dependabot #2015/#2016/#1519) still publish
codeql-dispatch/python=failurewith the samepy/incomplete-url-substring-sanitizationhit at line 43 of the stale file. That is branch lag, not an unfixed gate FP onmain. Updating those heads onto currentmainclears it; no further gate weakening.seonghobae commentedon Sep 18, 2026
Reopening: the closing evidence doesn't hold up on independent re-verification. This is not the "stale head, branch lag" residual case the closing comment anticipated — the base already contains the fix commit.
Fresh evidence
.githubPR #2065, headf2b5ecae4865ef2ba630d15abcde007ba57bd126, basea1d00341a5d559d99e36e1c0d575c1597a9f88ba.git merge-base --is-ancestor a1d0034... origin/main→ yes, so this base is not behind the fix — it already contains7d496d626/2acb7268.Dispatch run
35321940898, jobCodeQL dispatch scan (python)(105619407450), concluded failure at 2026-09-18T19:54:19Z (15+ hours after this issue was closed):Confirmed via
git show a1d00341a5d559d99e36e1c0d575c1597a9f88ba:tests/test_organization_commercial_readiness_loop_receipt_contract.py, line 60 is exactly the fixed shape described in the closing comment:Not
in source(the old flagged shape) — this is genuinely the_harden_runner_allowed_endpoints-parsed, set-membership version. My PR's own diff is.gitleaks.tomlonly and doesn't touch this file at all.What this means
The closing comment's verification (
results=0on #2209's head, run34994237669) was real evidence at the time, but it doesn't reproduce now against the actually-merged #2234 content on a current base. Either:py/incomplete-url-substring-sanitizationheuristic isn't actually satisfied by "membership in aset[str]built from a regex-parsed block" the way Option 1 assumed — i.e., the taint tracking still follows the literal back through there.search/splitlineschain intoendpointsand treats set membership the same as substring containment, so the fix doesn't structurally address the query's heuristic; orI can't distinguish those two from the outside without deeper CodeQL query-pack knowledge, but either way the finding is real, reproducible, and not resolved on
mainright now. Given Option 1 (rewrite to avoid the syntactic heuristic) has now failed once already, Option 2 (suppress with# codeql[py/incomplete-url-substring-sanitization]or equivalent CodeQL suppression syntax, with owner/justification/review-date per the warning-handling rule) or Option 3 (scope the scan) look more likely to actually hold up than a second attempt at rewriting the assertion shape.Not implementing a fix myself — same reasoning as before (not this file's writer, my PR doesn't touch it). Flagging with full reproduction evidence so whoever reopens this doesn't have to re-derive it.
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