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TI-2025-43169 Aliases CVE-2025-70955GHSA-964f-vc2f-ch6j

A Stack Overflow vulnerability was discovered in the TON Virtual Machine (TVM) before…

Priority MEDIUM 40CWE-674Published · Updated

Key facts

Attack vector
Network
Privileges required
None
User interaction
None
Attack complexity
Low
Impact type
Denial of service
Confidentiality · integrity · availability
None · None · High
Fix status
No fix listed

Attack profile from CVSS 3.1 · CISA ADP. Fix status from CNA. Impact type from CWE-674.

Summary

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.

Why it matters now

Exploitation None reported CISA SSVC · not in CISA KEV
EPSS 0.0068 52nd percentileScored 2026-11-07
Fix No fix listed No fixed version in the sources yet

SSVC decision points

CISA ADP · SSVC 2.0.3

Exploitation
None
Automatable
Yes
Technical impact
Partial

The decision (Track, Attend, Act) also depends on your mission and well-being impact; see CISA's SSVC guide.

Affected products

VendorProductAffected versionsFixed inStatusSource
——all versions—No fix listedCNA
  • — Vendor— Affected all versions Fixed in — No fix listed CNA

Remediation

No fixed version listed by the sources yet.

Timeline

  1. 2026-10-02 Threatist record created from CVE-2025-70955
  2. 2026-10-03 Alias added: GHSA-964f-vc2f-ch6j
  3. 2026-10-11 EPSS moved to the 50th–90th percentile

References

Other 4

Sources

This product uses the NVD API but is not endorsed or certified by the NVD. Sources and licences