What is CVE-2018-13043?

CVE-2018-13043 is a critical-severity vulnerability in Canonical Ubuntu Linux, classified under Code Injection. CVSS score: 9.8/10. Published 2018-07-01.

How severe is CVE-2018-13043?

Critical severity. CVSS v3 base score is 9.8 out of 10.

RCE in Canonical Ubuntu Linux

CVE-2018-13043

scripts/grep-excuses.pl in Debian devscripts through 2.18.3 allows code execution through unsafe YAML loading because YAML::Syck is used without a configuration that prevents unintended blessing.

Vulnerability class: RCE (Remote Code Execution)

Published 2018-07-01 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 9.8 (Critical). Vector: CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.025 (83.9th percentile), scored 2026-09-29.

Low probability of exploitation in the next 30 days, but still tracked. 84th percentile — 83.9% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.025 · newest: 0.025 · change: 0.000

Affected products

Canonical Ubuntu Linux — versions 17.10, 18.04
Debian Devscripts

Weakness classification (CWE)

CWE-94 — Code Injection

References

bugs.debian.org/902409 (Patch, Vendor Advisory)
usn.ubuntu.com/3704-1/ (vendor-advisory, Third Party Advisory)

Frequently asked questions

What is CVE-2018-13043?: CVE-2018-13043 is a critical-severity vulnerability in Canonical Ubuntu Linux, classified under Code Injection. CVSS score: 9.8/10. Published 2018-07-01.
How severe is CVE-2018-13043?: Critical severity. CVSS v3 base score is 9.8 out of 10.