CVE-2025-70955 Denial of service in n/a
Attackers can crash TON validator nodes by deploying smart contracts with deeply nested jumps, causing a network-wide denial of service.
- 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-2025-70955?
CVE-2025-70955 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 Stack Overflow vulnerability was discovered in the TON Virtual Machine (TVM) before v2024.10. The vulnerability stems from the improper handling of vmstate and continuation jump instructions, which allow for continuous dynamic tail calls. An attacker can exploit this by crafting a smart contract with deeply nested jump logic. Even within permissible gas limits, this nested execution exhausts the host process's stack space, causing the validator node to crash. This results in a Denial of Service (DoS) for the TON blockchain network.
Weakness: CWE-674
Which versions are affected by CVE-2025-70955?
How do I fix CVE-2025-70955?
No fix has been published for CVE-2025-70955 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-2025-70955 being exploited?
There is no known exploitation of CVE-2025-70955 in the wild and no public exploit code.
Sources
Also known as GHSA-964f-vc2f-ch6j.