# Security Alert - Geth suffers from a very low probable DoS attack vector - Update immediately

DevFeed: [Security Alert - Geth suffers from a very low probable DoS attack vector - Update immediately](<https://devfeed.tech/articles/security-alert-geth-suffers-from-a-very-low-probable-dos-attack-vector-update-immediately-16758.md>)

Original publisher: [Read original article](<https://blog.ethereum.org/en/2016/05/17/security-alert-geth-suffers-from-a-very-low-probable-dos-attack-vector-update-immediately>)

Author: Jeffrey Wilcke

Published: 2016-05-17T18:39:54Z

Content type: news

Language: en

Sources: [Ethereum Foundation Blog](<https://devfeed.tech/sources/ethereum-foundation-blog.md>)

Topics: [Security](<https://devfeed.tech/topics/security.md>), [bug](<https://devfeed.tech/topics/bug.md>), [Go Language](<https://devfeed.tech/topics/go-language.md>), [client](<https://devfeed.tech/topics/client.md>), [Ethereum](<https://devfeed.tech/topics/ethereum.md>)

Tags: [apt](<https://devfeed.tech/tags/apt.md>), [bug](<https://devfeed.tech/tags/bug.md>), [ethereum](<https://devfeed.tech/tags/ethereum.md>), [git](<https://devfeed.tech/tags/git.md>), [go](<https://devfeed.tech/tags/go.md>), [make](<https://devfeed.tech/tags/make.md>), [security](<https://devfeed.tech/tags/security.md>), [update](<https://devfeed.tech/tags/update.md>), [windows](<https://devfeed.tech/tags/windows.md>)

## AI overview

Ethereum reports a high-severity, very-low-likelihood bug affecting all Go client versions. The issue may let remote attackers stall synchronization almost indefinitely by supplying a valid, lighter chain. Hotfix and upgrade instructions are provided for Mist, PPA, Homebrew, Windows binaries, and source builds.

## Source excerpt

Affected configurations: All Go client versions Likelihood: Very low Severity: High Details: A bug in Geth (and potentially other clients) may suffer from a DoS attack and allows remote attackers to stall synchronisation process almost indefinitely by supplying a valid, lighter...