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.
History

Wed, 07 Oct 2026 10:15:00 +0000

Type Values Removed Values Added
Title Incorrect Buffer Size Calculation in Tinyexpr Leading to Process Crash

Wed, 07 Oct 2026 08:30:00 +0000

Type Values Removed Values Added
Title Buffer Size Miscalculation in tinyexpr's Expression Parser Causes Undefined Behavior and Possible Crash
Weaknesses CWE-119

Tue, 06 Oct 2026 18:30:00 +0000

Type Values Removed Values Added
Weaknesses CWE-131
Metrics cvssV3_1

{'score': 7.5, 'vector': 'CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H'}


Sun, 27 Sep 2026 12:15:00 +0000

Type Values Removed Values Added
First Time appeared Codeplea
Codeplea tinyexpr
Vendors & Products Codeplea
Codeplea tinyexpr

Sat, 26 Sep 2026 05:30:00 +0000

Type Values Removed Values Added
Title Buffer Size Miscalculation in tinyexpr's Expression Parser Causes Undefined Behavior and Possible Crash
Weaknesses CWE-119

Thu, 24 Sep 2026 15:30:00 +0000

Type Values Removed Values Added
Description 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.
References

cve-icon MITRE

Status: PUBLISHED

Assigner: mitre

Published: 2026-09-24T00:00:00.000Z

Updated: 2026-10-06T17:42:50.871Z

Reserved: 2026-09-10T00:00:00.000Z

Link: CVE-2026-88355

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Deferred

Published: 2026-09-24T16:17:12.833

Modified: 2026-10-06T18:16:57.013

Link: CVE-2026-88355

cve-icon Redhat

No data.