What is CVE-2019-10156?

CVE-2019-10156 is a medium-severity vulnerability in Debian Linux, classified under Information Disclosure. CVSS score: 5.4/10. Published 2019-07-30.

How severe is CVE-2019-10156?

Medium severity. CVSS v3 base score is 5.4 out of 10.

Is CVE-2019-10156 known to be exploited?

1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.

Information disclosure in Debian Linux

CVE-2019-10156

A flaw was discovered in the way Ansible templating was implemented in versions before 2.6.18, 2.7.12 and 2.8.2, causing the possibility of information disclosure through unexpected variable substitution. By taking advantage of unintended variable substitution the content of any variable may be disclosed.

Vulnerability class: Information Disclosure

Published 2019-07-30 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 5.4 (Medium). Vector: CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:L/I:L/A:N.

EPSS exploit prediction

EPSS: 0.018 (77.4th percentile), scored 2026-10-02.

Low probability of exploitation in the next 30 days, but still tracked. 77th percentile — 77.4% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.018 · newest: 0.018 · change: 0.000

Affected products

Debian Linux — versions 8.0, 9.0
Red Hat Ansible — versions fixed in 2.6.18, fixed in 2.7.12, fixed in 2.8.2
Red Hat Ansible
Red Hat OpenStack — versions 13, 14

Weakness classification (CWE)

CWE-200 — Information Disclosure

Public proof-of-concept exploits

n0-traces/cve_

References

bugzilla.redhat.com/show_bug.cgi (Issue Tracking, Vendor Advisory)
github.com/ansible/ansible/pull/57188 (Patch, Third Party Advisory)
lists.debian.org/debian-lts-announce/2019/09/msg00016.html (Vendor Advisory, mailing-list)
access.redhat.com/errata/RHSA-2019:3744 (vendor-advisory, Vendor Advisory)
access.redhat.com/errata/RHSA-2019:3789 (vendor-advisory, Vendor Advisory)
lists.debian.org/debian-lts-announce/2021/01/msg00023.html (mailing-list, Mailing List, Third Party Advisory)
www.debian.org/security/2021/dsa-4950 (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2019-10156?: CVE-2019-10156 is a medium-severity vulnerability in Debian Linux, classified under Information Disclosure. CVSS score: 5.4/10. Published 2019-07-30.
How severe is CVE-2019-10156?: Medium severity. CVSS v3 base score is 5.4 out of 10.
Is CVE-2019-10156 known to be exploited?: 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.