{"dataType": "CVE_RECORD", "cveMetadata": {"state": "PUBLISHED", "cveId": "CVE-2026-88355", "assignerOrgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "assignerShortName": "mitre", "dateUpdated": "2026-09-24T15:27:36.765Z", "dateReserved": "2026-09-10T00:00:00.000Z", "datePublished": "2026-09-24T00:00:00.000Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "8254265b-2729-46b6-b9e3-3dfca2d5bfca", "shortName": "mitre", "dateUpdated": "2026-09-24T15:27:36.765Z"}, "descriptions": [{"lang": "en", "value": "An incorrect buffer size calculation vulnerability exists in tinyexpr commit 4a7456e in new_expr(). For arity-0 expression nodes, including constants, variables, and zero-argument functions, the function allocates less memory than sizeof(te_expr) but treats the returned allocation as a complete te_expr object. This results in undefined behavior and can cause deterministic process termination in UBSan-instrumented builds."}], "affected": [{"vendor": "n/a", "product": "n/a", "versions": [{"version": "n/a", "status": "affected"}]}], "references": [{"url": "https://github.com/codeplea/tinyexpr/issues/145"}, {"url": "https://github.com/szaydel/tinyexpr/commit/fe7459728c2ab8d2f91365abe56601cdd0e24f9b"}], "problemTypes": [{"descriptions": [{"type": "text", "lang": "en", "description": "n/a"}]}]}}, "dataVersion": "5.2"}

{}

{"affected": [{"affectedData": [{"product": "n/a", "vendor": "n/a", "versions": [{"status": "affected", "version": "n/a"}]}], "source": "[email protected]"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "An incorrect buffer size calculation vulnerability exists in tinyexpr commit 4a7456e in new_expr(). For arity-0 expression nodes, including constants, variables, and zero-argument functions, the function allocates less memory than sizeof(te_expr) but treats the returned allocation as a complete te_expr object. This results in undefined behavior and can cause deterministic process termination in UBSan-instrumented builds."}], "id": "CVE-2026-88355", "lastModified": "2026-09-24T21:08:55.030", "metrics": {}, "published": "2026-09-24T16:17:12.833", "references": [{"source": "[email protected]", "url": "https://github.com/codeplea/tinyexpr/issues/145"}, {"source": "[email protected]", "url": "https://github.com/szaydel/tinyexpr/commit/fe7459728c2ab8d2f91365abe56601cdd0e24f9b"}], "sourceIdentifier": "[email protected]", "vulnStatus": "Deferred"}

{}

{"created": "2026-09-26T05:15:04.836783+00:00", "title": "Buffer Size Miscalculation in tinyexpr's Expression Parser Causes Undefined Behavior and Possible Crash", "updated": "2026-09-26T05:15:04.836790+00:00", "vendors": [], "weaknesses": ["CWE-119"]}