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ProbeLabs23 findings · 123 requirementsThe fastest JSON parser for Go — formally verified with ReqProof (real library, master).
When the current path segment is a valid array index but the index is out of bounds for the addressed array, Get shall return the defined not-found result.
Specification
The requirement exactly as authored — its complete prose text and, where present, the formal FRETish sentence it compiles to.
When the current path segment is a valid array index but the index is out of bounds for the addressed array, Get shall return the defined not-found result.
the parser shall always satisfy !path_segment_is_array_index | !array_index_segment_is_valid | !array_index_is_out_of_bounds | returns_oob_array_index_not_found
Rationale & tags
Why this requirement exists, and how it is categorised.
Rationale & tags
Why this requirement exists, and how it is categorised.
Out-of-bounds array access is behaviorally distinct from malformed index syntax and from successful element resolution.
Verification & provenance
How this requirement was checked: the review trail, edit history, and the machine-analysis status terms (each ⓘ explains what it means).
Review
- Status
- approved
- Reviewer
- Buger · lead_engineer
- Reviewed
- Jul 26, 2026, 15:21 UTC
History
- Created
- Apr 14, 2026, 00:00 UTC · Created via CLI
- Modified
- Jul 26, 2026, 15:21 UTC · Buger
Change history
Every recorded revision of this requirement's source file — newest first, each with its commit message and the diff for that change.
Every recorded revision of this object's source — newest first, each with the commit message and its file-level diff.
Obligations
What this requirement must witness to be considered satisfied — the required evidence, and the tests that discharge each one.
2 obligations · 2 discharged
Browse the catalogueBehavior at limits, thresholds, and edge-of-range values.
Get with path [5] on [1,2,3] returns the last element instead of not-found due to an off-by-one in the array bounds check, masking an out-of-range access as a valid value.
- nominalrequiredpresentCovered by 1 test
Behavior for unusual but valid input combinations.
Get on a single-element array with index [0] returns wrong element due to off-by-one in i+1 increment, or panics on [1] due to unchecked post-increment dereference.
- nominalrequiredpresentCovered by 1 test
Formula evidence
The formal formula behind this requirement, the variables it is written over, and the tests that exercise it (each term is explained inline).
Formula evidence
The formal formula behind this requirement, the variables it is written over, and the tests that exercise it (each term is explained inline).
FRETish formula
the parser shall always satisfy !path_segment_is_array_index | !array_index_segment_is_valid | !array_index_is_out_of_bounds | returns_oob_array_index_not_found
Variables
| Name | Type | Direction | Description |
|---|---|---|---|
| path_segment_is_array_index | — | True when the current lookup path segment is interpreted as an array index. | |
| array_index_segment_is_valid | — | True when the current array-index path segment has valid index syntax. | |
| array_index_is_out_of_bounds | — | True when the addressed array index exceeds the bounds of the addressed array. | |
| returns_oob_array_index_not_found | — | True when Get reports the defined not-found outcome for a valid but out-of-bounds array index. |
Witnesses· 5 scenarios total
- TestMCDC_SYS_REQ_023_Row1_InBoundsexercises 1 condition scenario
- TestMCDC_SYS_REQ_023_Row2_InvalidOutOfBoundsexercises 1 condition scenario
- TestMCDC_SYS_REQ_023_Row3_NotArraySegmentexercises 1 condition scenario
- TestMCDC_SYS_REQ_023_Row4_InvariantViolationexercises 1 condition scenario
- TestMCDC_SYS_REQ_023_Row5_OobNotFoundexercises 1 condition scenario
MC/DC truth table· 5 rows
Each row assigns the formula's conditions (T/F) and shows the Result— the formula's value for that input row, not a test pass/fail. A row proves a condition when flipping only that condition flips the outcome. The test that covers each row is linked.
mcdc:ignoreNo-actionfalse-result row satisfied by designUncoveredneeds a covering test| # | array_index_is_out_of_bounds | array_index_segment_is_valid | path_segment_is_array_index | returns_oob_array_index_not_found | Result | Proves | Covering test |
|---|---|---|---|---|---|---|---|
| 1 | F | T | T | F | T | array_index_is_out_of_bounds | |
| 2 | T | F | T | F | T | array_index_segment_is_valid | |
| 3 | T | T | F | F | T | path_segment_is_array_index | |
| 4 | T | T | T | F | F | array_index_is_out_of_bounds | |
| 5 | T | T | T | T | T | returns_oob_array_index_not_found |
Its place
This requirement shown inside its trace neighbourhood — the parents it satisfies, the code and tests attached to it, and its findings.
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Trace evidence
The concrete artifacts linked to this requirement — implementing code, verifying tests, documents, and the findings raised against it.
Impact
Blast radius — if you change this requirement, what else may need re-checking, and what it in turn depends on.
Impact
Blast radius — if you change this requirement, what else may need re-checking, and what it in turn depends on.
If you change this
Files to re-check (1)
- parser.goparser.go
Tests to re-run (4)
- deep_spec_test.godeep_spec_test.go
- mcdc_spec_witnesses_test.gomcdc_spec_witnesses_test.go
- obligation_evidence_test.goobligation_evidence_test.go
- parser_test.goparser_test.go
What this rests on
Parent requirements (1)
Discussions
Discuss this with the proof team. Nothing changes in your audit automatically — you open a request and a staff member records any outcome inside the thread.