CVE-2026-88355
High
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.
SeverityHigh
CVSS7.5
Exploit probability36. percentile0.4%
ProductTinyexpr
PublishedSep 24, 2026
First seenSep 24, 2026
Weakness typeCWE-131CWE-131
How to fix
Sources list no fixed version or patch link for this vulnerability.
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| tinyexpr | No range specified | — |
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