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GitHub Actions can run steps concurrently by grouping them under `parallel:`. The grouped steps sit one level below the job's step list, so every detector skipped them: credential sources, unpinned and compromised actions, script, artifact, and AI-agent injection, OIDC consumers, environment checks, and pin suggestions all missed steps inside a group. Add parsers.steps.expand_steps/job_steps, which flatten parallel groups in order, and route every step loop through them. Background steps and cancel/wait steps are ordinary step mappings and need no special case. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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| Check name | Status | Explanation | Resolution |
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Docstring coverage is 42.11% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 38 functions across 10 files. (1 skipped:… | Write docstrings for the functions missing them to satisfy the coverage threshold. |
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Check name Status Explanation Linked Issues check Issue #154requirements are met.actionscope/parsers/steps.pyprovides the sharedexpand_steps()andjob_steps()helpers. The helper preserves order, expands nestedparallelgroups, drops non-…Out of Scope Changes check The changes stay within Issue #154. The parser helpers, analyzer updates, pin-resolver update, regression tests, cycle handling, artifact concurrency handling, and changelog entry directly support ana…Description Check Check skipped - CodeRabbit’s high-level summary is enabled. Title check The title clearly and concisely describes the main change: analyzing steps inside parallelgroups.
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Docstring coverage is 42.11% which is insufficient. The required threshold is 80.00%. Docstring coverage is scoped to functions touched by this diff. Analyzed 38 functions across 10 files. (1 skipped: 1 unsupported.)
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Review comments at @actionscope/analyzers/artifact_poisoning.py:
- Line 70: Update the artifact execution classification loop using job_steps so
run steps in a parallel group are checked against sibling download-artifact
steps regardless of their order, while preserving group membership when
determining concurrent steps.
Review comments at @actionscope/parsers/steps.py:
- Around line 23-25: Update expand_steps to detect cyclic parallel groups before
recursing, emit a warning for the affected workflow, and continue scanning other
workflows without raising RecursionError.
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📒 Files selected for processing (11)
CHANGELOG.mdactionscope/analyzers/ai_agent_injection.pyactionscope/analyzers/artifact_poisoning.pyactionscope/analyzers/compromised_actions.pyactionscope/analyzers/github_environments.pyactionscope/analyzers/github_token.pyactionscope/analyzers/script_injection.pyactionscope/parsers/steps.pyactionscope/parsers/workflow.pyactionscope/resolvers/pin_resolver.pytests/test_parallel_steps.py
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A YAML alias can make a parallel group contain itself. Recursive expansion then hit the recursion limit, and the pipeline dropped every workflow finding for the repository. Expand groups iteratively and do not re-enter a group that is already open. Artifact poisoning only counted run steps listed after a download. A parallel sibling, or a background step started earlier, can execute the downloaded content too, so count those as executing after the download. Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
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| elif id(group) not in open_groups: | ||
| open_groups.append(id(group)) | ||
| pending.append(iter(group)) |
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When an acyclic YAML alias graph references each preceding parallel list more than once, the group ID leaves open_groups after each traversal and is expanded again. This makes a workflow with only n nested definitions produce 2^n entries; for example, 22 levels produce 4,194,304 entries and take roughly 11 seconds locally, while slightly deeper inputs can exhaust memory and prevent the remaining workflows from being scanned. Add an overall expansion limit or otherwise avoid materializing repeated alias subgraphs.
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Fixed in 0654e73. now enters each aliased list once per traversal, bounding work to the parsed workflow graph. A 12-level repeated acyclic alias regression expands to one unique step instead of 4,096 copies.
| seen_download = seen_download or downloads | ||
| background_execution = background_execution or any( | ||
| runs_in_background(step) for step in executing | ||
| ) |
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When an executing background step is followed by wait, wait-all, or a matching cancel before the artifact download, background_execution remains true forever, so the later download is incorrectly classified as concurrent execution and can elevate the finding to HIGH or CRITICAL. GitHub specifies that wait pauses until the referenced steps complete and cancel terminates the referenced step, so these control steps need to remove the affected executions from the active-background state.
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Fixed in f787628. Artifact analysis tracks named and anonymous active background executions, then clears them at , matching , or barriers. Regressions cover every form.
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| if not isinstance(step, dict): | ||
| continue | ||
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| for step in job_steps(job): |
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When a parallel group contains a valid uses: $/path/to/action, this newly expanded loop passes it to classify_action_ref(), which recognizes only ./ and ../ as local; because a valid $/ reference has no @ suffix, it is classified as unresolvable and reported as an unpinned external action. The pin resolver's new $/ exclusion does not suppress this primary scan finding. GitHub documents that $/ resolves to the current repository at the running commit and must not include a ref suffix, so it should be treated as local/pinned here as well. GitHub workflow syntax
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Fixed in 3c58148. Both pin classification and SHA-pinning checks now treat as same-repository/local, and a parallel-group regression confirms it is not reported as unpinned.
| for step in executing: | ||
| if not runs_in_background(step): | ||
| continue | ||
| step_id = step.get("id") | ||
| if isinstance(step_id, str) and step_id.strip(): | ||
| active_background_execution.add(step_id.strip()) |
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When an executing member of a parallel group also declares background: true, these lines add it to the state carried into subsequent top-level groups, so a later artifact download is incorrectly considered concurrent and can elevate the finding to HIGH or CRITICAL. A parallel group has an implicit wait before the next step regardless of the members' background representation, so backgrounds originating within that group must be removed at its boundary. GitHub workflow syntax
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Fixed in 3c58148. Concurrent groups now carry an explicit implicit-wait marker. Background executions started inside a group are retired at that boundary, while preexisting backgrounds remain active. Both cases have regressions.
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ActionScope/actionscope/parsers/workflow.py
Line 317 in 0654e73
Classify self-repository action references as local
When a newly scanned parallel member uses the valid $/path/to/action form, classify_action_ref() still recognizes only ./ and ../ as local and therefore reports the reference as an unpinned external action. GitHub specifies that $/ resolves to the current repository at the running commit (workflow syntax). Fresh evidence in the latest head is that the local-reference fix only excludes $/ in the pin resolver, while this primary finding path remains unchanged, so the false-positive finding is still emitted.
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| continue | ||
| step_id = step.get("id") | ||
| if isinstance(step_id, str) and step_id.strip(): | ||
| active_background_execution.add(step_id.strip()) |
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When an executing member of a parallel group explicitly declares background: true, this adds it to the active state that is carried into later top-level groups, so a subsequent artifact download is incorrectly treated as concurrent and may raise the finding to HIGH or CRITICAL. GitHub defines parallel as background steps followed by an implicit wait, so every member has completed before the next top-level step starts (workflow syntax). Fresh evidence in the latest head is that the lifecycle fix still inserts this member here without clearing it at the group boundary.
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Fixes #154.
Problem
GitHub Actions can run steps concurrently by grouping them under
parallel:(changelog). The grouped steps are nested one level belowjobs.<id>.steps, and every step loop in ActionScope only looked at the top level. A workflow that moved itsconfigure-aws-credentialsstep and an injectablerun:step into a parallel group dropped from critical to high: the credential binding, unpinned action, and script injection findings all disappeared.Change
actionscope/parsers/steps.pywithexpand_steps()/job_steps(), which flattenparallelgroups in order and drop non-mapping entries._job_steps,_steps) are removed.background: truesteps andcancel:/waitsteps are ordinary step mappings, so they need no special handling. Control steps have nousesorrun, so detectors skip them as before.Tests
tests/test_parallel_steps.py:coverage_repofixture (which triggers every detector), rewrites each job's steps as aparallel:group or asbackground: truesteps, and asserts the scan JSON is identical to the sequential original;maintoo and is kept as a guard.ruff checkclean; full suite: 823 passed.🤖 Generated with Claude Code
Summary by CodeRabbit
parallel:groups, including credential, action, script-injection, and artifact-poisoning checks.