CVE-2026-88355

HIGH 7.5

CVSS Score

7.5

EPSS Score

0.2%

EPSS Percentile

4th

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.

Vendor	n/a
Product	n/a
Published	Sep 24, 2026
Last Updated	Oct 6, 2026

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Affected Versions

n/a / n/a

n/a

References

NVD ↗ CVE.org ↗ EPSS Data ↗

github.com: https://github.com/codeplea/tinyexpr/issues/145 github.com: https://github.com/szaydel/tinyexpr/commit/fe7459728c2ab8d2f91365abe56601cdd0e24f9b