SB2020112448 - Out-of-bounds read in go-ethereum
Published: November 24, 2020 Updated: April 27, 2026
Security Bulletin ID
SB2020112448
CSH Severity
Medium
Patch available
YES
Number of vulnerabilities
1
Exploitation vector
Remote access
Highest impact
Denial of service
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 1 vulnerability.
1) Out-of-bounds read (CVE-ID: CVE-2020-26242)
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in the uint256 library MulMod operation when processing a MULMOD operation with a modulo value of 0. A remote attacker can submit a crafted block containing mulmod(a,b,0) to cause a denial of service.
Successful exploitation causes vulnerable nodes to crash during block processing and drop off the network.
Remediation
Install update from vendor's website.