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jsonparser
ProbeLabs23 findings · 123 requirementsWhen GetString addresses a JSON string value containing a truncated escape sequence, the parser shall return an error from the ParseString unescape step rather than returning corrupted output.
Specification
The requirement exactly as authored — its complete prose text and, where present, the formal FRETish sentence it compiles to.
When GetString addresses a JSON string value containing a truncated escape sequence, the parser shall return an error from the ParseString unescape step rather than returning corrupted output.
the parser shall always satisfy !getstring_value_has_truncated_escape | returns_getstring_error_for_truncated_escape
Rationale & tags
Why this requirement exists, and how it is categorised.
Rationale & tags
Why this requirement exists, and how it is categorised.
GetString calls ParseString for unescaping. Truncated escape sequences must surface as errors through GetString.
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
- Aug 20, 2026, 13:11 UTC
History
- Created
- Apr 14, 2026, 18:00 UTC · Claude · AI agent
- Modified
- Aug 20, 2026, 13:11 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.
Review history
Human and AI-agent approvals of this requirement — the 'why was this approved' lineage, each with the reviewer's justification and the code it cites.
- Claude:spec Conformance · AI agentApprovedSpec conformanceAug 20, 2026 · last monthREVIEW-52
For a string value containing a backslash, GetString routes to ParseString(v) (parser.go:2066), which calls Unescape; when an escape is truncated, unescapeToUTF8Config returns inLen == -1 and Unescape returns MalformedStringEscapeError (escape.go:324-325), which ParseString converts to MalformedValueError (parser.go:2150-2151). Thus a truncated escape yields a non-nil error rather than corrupted output, satisfying !getstring_value_has_truncated_escape | returns_getstring_error_for_truncated_escape. The
\\-presence guard (parser.go:2062) ensures only escape-bearing values reach ParseString, so the unescape error path is the sole outcome for the addressed case.Cited code (3)
Obligations
What this requirement must witness to be considered satisfied — the required evidence, and the tests that discharge each one.
1 obligation · 1 discharged
Browse the catalogueGetString on a value like "\u00 reads 4 hex digits past EOF in ParseString's hex-decode loop, panicking with index-out-of-range or returning a corrupt rune to the caller.
- 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 !getstring_value_has_truncated_escape | returns_getstring_error_for_truncated_escape
Variables
| Name | Type | Direction | Description |
|---|---|---|---|
| getstring_value_has_truncated_escape | — | True when GetString addresses a JSON string value containing a truncated escape sequence. | |
| returns_getstring_error_for_truncated_escape | — | True when GetString returns an error from ParseString for a truncated escape sequence. |
Witnesses· 3 scenarios total
- TestMCDC_SYS_REQ_072_Row1_TriggerFalseexercises 1 condition scenario
- TestMCDC_SYS_REQ_072_Row2_InvariantViolationexercises 1 condition scenario
- TestMCDC_SYS_REQ_072_Row3_TruncatedEscapeErrorexercises 1 condition scenario
MC/DC truth table· 3 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| # | getstring_value_has_truncated_escape | returns_getstring_error_for_truncated_escape | Result | Proves | Covering test |
|---|---|---|---|---|---|
| 1 | F | F | T | getstring_value_has_truncated_escape | |
| 2 | T | F | F | getstring_value_has_truncated_escape | |
| 3 | T | T | T | returns_getstring_error_for_truncated_escape |
Its place
How this requirement connects — what proves it, what it affects, and what it rests on. Authored links only here; automatically derived links come from the audit index.
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Trace evidence
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Impact
Blast radius — authored trace links only (automatically derived links come from the audit index and aren't shown here).
Impact
Blast radius — authored trace links only (automatically derived links come from the audit index and aren't shown here).
If you change this
Files to re-check (1)
- parser.goparser.go
Tests to re-run (3)
- deep_spec_test.godeep_spec_test.go
- mcdc_spec_witnesses_test.gomcdc_spec_witnesses_test.go
- obligation_evidence_test.goobligation_evidence_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.