CVE-2018-12557

Severity: critical (CVSS 9.8 v3.0)
Exploited in the wild: not listed in CISA KEV
EPSS: 1.9% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2018-06-19 · updated 2026-06-17
Weakness: CWE-200

Description

An issue was discovered in Zuul 3.x before 3.1.0. If nodes become offline during the build, the no_log attribute of a task is ignored. If the unreachable error occurred in a task used with a loop variable (e.g., with_items), the contents of the loop items would be printed in the console. This could lead to accidentally leaking credentials or secrets.

Affected products

Zuul-Ci Zuul: from 3.0.0 before 3.1.0 — fixed in 3.1.0

How to fix

Upgrade to a fixed version: Zuul-Ci Zuul 3.1.0. Check the vendor advisory for mitigations.

References

http://lists.zuul-ci.org/pipermail/zuul-announce/2018-June/000015.html
https://git.zuul-ci.org/cgit/zuul/commit/?id=ffe7278c08e6e36bf8b18f732c764e00ff51551e
https://storyboard.openstack.org/#%21/story/2002177
http://lists.zuul-ci.org/pipermail/zuul-announce/2018-June/000015.html
https://git.zuul-ci.org/cgit/zuul/commit/?id=ffe7278c08e6e36bf8b18f732c764e00ff51551e
https://storyboard.openstack.org/#%21/story/2002177

Get alerted when CVE-2018-12557 or the next vulnerability affects your stack