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.
CVE-2026-88355
NONE
EPSS 0.15%
Updated Sep 25, 2026
An
CVE Details
CVE ID
CVE-2026-88355
Published Date
Sep 24, 2026
Vendor
An
Severity
NONE
Exploit Prediction (EPSS)
Probability of Exploit
0.15%
Likelihood of exploitation in next 30 days
Percentile:
4.1th percentile (higher than 4.1% of all CVEs)
Standard patching cycle
Impact
Minimal impact
Source
View Advisory