CVE-2025-59942: filecoin-project go-f3 Integer Overflow or Wraparound

Vulnerability summary

CVE-2025-59942 is a high (CVSS 7.5) Integer Overflow or Wraparound vulnerability in filecoin-project go-f3. EPSS estimates a 0.34% chance of exploitation in the next 30 days, higher than 25.2% of scored vulnerabilities.

Timeline

1. 29-09-2025
   PublishedVulnerability first disclosed.
2. 30-09-2025
   Last modifiedVulnerability information updated.

Description

go-f3 is a Golang implementation of Fast Finality for Filecoin (F3). In versions 0.8.6 and below, go-f3 panics when it validates a "poison" messages causing Filecoin nodes consuming F3 messages to become vulnerable. A "poison" message can can cause integer overflow in the signer index validation, which can cause the whole node to crash. These malicious messages aren't self-propagating since the bug is in the validator. An attacker needs to directly send the message to all targets. This issue is fixed in version 0.8.7.

• CWE-190Integer Overflow or WraparoundThe product performs a calculation that can produce an integer overflow or wraparound when the logic assumes that the resulting value will always be larger than the original value. This occurs when an integer value is incremented to a value that is too large to store in the associated representation. When this occurs, the value may become a very small or negative number.