{"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": "cve@mitre.org"}], "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": "cve@mitre.org", "url": "https://github.com/codeplea/tinyexpr/issues/145"}, {"source": "cve@mitre.org", "url": "https://github.com/szaydel/tinyexpr/commit/fe7459728c2ab8d2f91365abe56601cdd0e24f9b"}], "sourceIdentifier": "cve@mitre.org", "vulnStatus": "Deferred"}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "4a7456e"}}], "enrichment": {"confidence": 100.0, "confidence_source": "inferred", "scores": [{"score": 100.0, "source": "inferred"}]}, "original": {"product": "n/a", "source": "cna", "vendor": "n/a"}, "product": "tinyexpr", "vendor": "codeplea"}], "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": "2026-09-27T11:45:17.071977+00:00", "vendors": ["codeplea", "codeplea$PRODUCT$tinyexpr"], "weaknesses": ["CWE-119"]}