What is CVE-2019-6338?

CVE-2019-6338 is a high-severity vulnerability in Drupal, classified under Deserialization of Untrusted Data. CVSS score: 8.0/10. Published 2019-01-22.

How severe is CVE-2019-6338?

High severity. CVSS v3 base score is 8.0 out of 10.

Deserialization in Drupal

CVE-2019-6338

In Drupal Core versions 7.x prior to 7.62, 8.6.x prior to 8.6.6 and 8.5.x prior to 8.5.9; Drupal core uses the third-party PEAR Archive_Tar library. This library has released a security update which impacts some Drupal configurations. Refer to CVE-2018-1000888 for details

Vulnerability class: Insecure Deserialization

Published 2019-01-22 · last modified 2026-06-17.

CVSS v3 metric

CVSS v3 base score 8.0 (High). Vector: CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H.

EPSS exploit prediction

EPSS: 0.021 (81.6th percentile), scored 2026-10-19.

Low probability of exploitation in the next 30 days, but still tracked. 82nd percentile — 81.6% of CVEs in the catalogue have a lower EPSS than this one. How to read EPSS.

EPSS over last 30 days · oldest: 0.021 · newest: 0.021 · change: -0.000

Affected products

Drupal
Drupal Core — versions 7.x, 8.6.x, 8.5.x
Debian Linux — versions 8.0, 9.0

Weakness classification (CWE)

CWE-502 — Deserialization of Untrusted Data

References

www.drupal.org/sa-core-2019-001 (Patch, Vendor Advisory)
www.debian.org/security/2019/dsa-4370 (vendor-advisory, Third Party Advisory)
lists.debian.org/debian-lts-announce/2019/02/msg00032.html (mailing-list, Mailing List, Third Party Advisory)
www.securityfocus.com/bid/106706 (Third Party Advisory, vdb-entry)

Frequently asked questions

What is CVE-2019-6338?: CVE-2019-6338 is a high-severity vulnerability in Drupal, classified under Deserialization of Untrusted Data. CVSS score: 8.0/10. Published 2019-01-22.
How severe is CVE-2019-6338?: High severity. CVSS v3 base score is 8.0 out of 10.