CVE-2025-70956 Denial of service in n/a
Attackers can cause denial of service in TON smart contracts by triggering a state corruption in the virtual machine during child VM initialization.
- 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-2025-70956?
CVE-2025-70956 is a high-severity denial of service vulnerability in n/a, published on 13 Feb 2026. An attacker can exploit it over the internet without logging in, with no action from the victim.
Official description
A State Pollution vulnerability was discovered in the TON Virtual Machine (TVM) before v2025.04. The issue exists in the RUNVM instruction logic (VmState::run_child_vm), which is responsible for initializing child virtual machines. The operation moves critical resources (specifically libraries and log) from the parent state to a new child state in a non-atomic manner. If an Out-of-Gas (OOG) exception occurs after resources are moved but before the state transition is finalized, the parent VM retains a corrupted state where these resources are emptied/invalid. Because RUNVM supports gas isolation, the parent VM continues execution with this corrupted state, leading to unexpected behavior or denial of service within the contract's context.
Weakness: CWE-1321
Which versions are affected by CVE-2025-70956?
How do I fix CVE-2025-70956?
No fix has been published for CVE-2025-70956 yet. Limit exposure of the affected software until one is available.
Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.
Is CVE-2025-70956 being exploited?
There is no known exploitation of CVE-2025-70956 in the wild and no public exploit code.
Sources
Also known as GHSA-9xqh-f8h9-23pv.