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Published: 09 August 2017

Sandstorm Cap'n Proto before and 0.5.x before, when an application invokes the totalSize method on an object reader, allows remote peers to cause a denial of service (CPU consumption) via a crafted small message, which triggers a "tight" for loop. NOTE: this vulnerability exists because of an incomplete fix for CVE-2015-2312.

From the Ubuntu security team

David Renshaw discovered that the Cap'n Proto utility has a vulnerability that allows an attacker to cause denial of service via a crafted message.



CVSS 3 base score: 7.5


Package Release Status
Launchpad, Ubuntu, Debian
Released (
Ubuntu 18.04 LTS (Bionic Beaver) Not vulnerable

Ubuntu 16.04 ESM (Xenial Xerus) Not vulnerable
Ubuntu 14.04 ESM (Trusty Tahr) Does not exist
(trusty was released [0.4.0-1ubuntu2.1])