CVE-2026-88355 Integer overflow in n/a
Incorrect buffer size calculation in tinyexpr causes undefined behavior and deterministic process termination for arity-0 expression nodes.
- Exploited in the wild
- Not known
- Login needed
- Not needed
- Attackable
- Over the internet
- Victim action needed
- Not needed
- Fix
- None listed
What is CVE-2026-88355?
CVE-2026-88355 is a high-severity vulnerability in n/a, published on 24 Sep 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official 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.
Weakness: CWE-131
Which versions are affected by CVE-2026-88355?
How do I fix CVE-2026-88355?
No fix has been published for CVE-2026-88355 yet. Limit exposure of the affected software until one is available.
Is CVE-2026-88355 being exploited?
It is not confirmed as exploited in the wild, but public exploit code for CVE-2026-88355 exists.
Sources
Also known as GHSA-8v6x-g49v-x5cf.