CVE-2019-6338 | third-party PEAR Archive_Tar library updates

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

Published: 2019-01-22 Last update: 2026-06-16 Assigner: [email protected] Source: [email protected]
NVD Status：Modified，CVE State: published
View at NVD, CVE.org, EUVD

CVE-2019-6338 is rated Moderate Risk (61.5/100): CVSS High severity, with medium exploitation likelihood (EPSS 2.27%). EPSS rose +1.23% over the last day, indicating growing attacker interest. Review affected assets and schedule remediation.

Risk is dynamic; we continuously reassess and refresh what is shown on this page as upstream context changes.

Exploit prediction scoring system (EPSS) score for CVE-2019-6338

EPSS lead: Daily EPSS estimates relative likelihood of exploitation; percentile ranks this CVE among scored vulnerabilities (higher = more severe relative rank).

# Date Old EPSS score New EPSS score Delta (New - Old)
1 2026-06-15 1.05% 2.27% +1.23%
2 2026-03-04 1.09% 1.05% -0.04%
3 2026-03-01 — 1.09% —

Full EPSS history (36 records total)

Common vulnerability scoring system (CVSS) metrics for CVE-2019-6338

CVSS metrics for this CVE.

Base score Version Severity Vector Exploitability Impact Score source
8.0 3.0 HIGH
CVSS:3.0/AV:N/AC:L/PR:L/UI:R/S:U/C:H/I:H/A:H Click to expand
Attack vector (AV:N)
Could be attacked over the internet or any normal routed network—not just someone sitting at the machine.
Attack complexity (AC:L)
Once they can reach the bug, pulling it off is straightforward—no weird race conditions or rare setup.
Privileges required (PR:L)
A normal user session is enough; they don’t have to be admin.
User interaction (UI:R)
A real person has to do something—click, install, enable—otherwise it doesn’t land.
Scope (S:U)
Damage stays in the same “trust bubble” as the broken component—no big spill into unrelated systems.
Confidentiality (C:H)
Serious risk that confidential data gets exposed in a big way.
Integrity (I:H)
They could widely tamper with or forge data—trust in the data is badly hurt.
Availability (A:H)
Could take the service down hard or make it unusable for people who depend on it.
 2.1 5.9 [email protected]
6.0 2.0 MEDIUM
AV:N/AC:M/Au:S/C:P/I:P/A:P Click to expand
Access vector (AV:N)
Can be exploited remotely over network reachability.
Access complexity (AC:M)
Exploitation needs some favorable conditions, but not exceptional ones.
Authentication (AU:S)
A single authentication is required.
Confidentiality impact (C:P)
Partial confidentiality impact.
Integrity impact (I:P)
Partial integrity impact.
Availability impact (A:P)
Partial availability impact.
 6.8 6.4 [email protected]

Weakness enumeration for CVE-2019-6338

GitHub Security Advisory for CVE-2019-6338

GHSA-6rmq-x2hv-vxpp · Severity: high · Ecosystem: composer — Drupal core third-party PEAR Archive_Tar library is vulnerable to Deserialization of Untrusted Data

OS Trackers for CVE-2019-6338

vendor priority summary link
ubuntu medium CVE-2019-6338 medium priority: Ubuntu including 1 source packages (drupal7), 19 status rows across 19 suites (bionic, cosmic, disco, eoan, focal, groovy, hirsute, impish, jammy, kinetic, lunar, mantic, noble, oracular, plucky, questing, trusty, upstream, xenial): DNE 16, needed 2, needs-triage 1. https://ubuntu.com/security/CVE-2019-6338

Affected software / configurations for CVE-2019-6338

Vendor Product Version Raw CPE
drupal drupal >= 7.0, < 7.62 cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
drupal drupal >= 8.5.0, < 8.5.9 cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
drupal drupal >= 8.6.0, < 8.6.6 cpe:2.3:a:drupal:drupal:*:*:*:*:*:*:*:*
debian debian_linux 8.0 cpe:2.3:o:debian:debian_linux:8.0:*:*:*:*:*:*:*
debian debian_linux 9.0 cpe:2.3:o:debian:debian_linux:9.0:*:*:*:*:*:*:*

References for CVE-2019-6338

cvelogic Threat Intelligence