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Vulnerabilities / CVE-2017-6920

critical

CVE-2017-6920

PECL YAML parser unsafe object handling

Published Modified CWE 19
In the Trivy database since at least 24 Oct 2026, 07:11 UTCWhen it arrived before that build is not recorded.

Severity by source

NVD9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
GHSA9.8CVSS:3.0/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Trivy's own label is CRITICAL. Rated critical by NVD, GHSA.

Description

Drupal core 8 before versions 8.3.4 allows remote attackers to execute arbitrary code due to the PECL YAML parser not handling PHP objects safely during certain operations.

Affected packages and fixed versions

SourcePackageFixed in
composer::GitHub Security Advisory Composerdrupal/core, drupal/drupal8.3.4
composer::PHP Security Advisories Databasedrupal/core, drupal/drupalno fix listed
Show all 4 entries from 2 sources
SourcePackageFixed in
composer::GitHub Security Advisory Composerdrupal/core8.3.4
composer::GitHub Security Advisory Composerdrupal/drupal8.3.4
composer::PHP Security Advisories Databasedrupal/coreno fix listed
composer::PHP Security Advisories Databasedrupal/drupalno fix listed

References

Vulnerability data compiled from the Trivy vulnerability database (trivy-db, Aqua Security, Apache License 2.0), which aggregates third-party advisories. CVE records are published by The MITRE Corporation under the CVE Terms of Use; CVE is a trademark of MITRE. This product uses data from the NVD API but is not endorsed or certified by the NVD. Severity, titles and advisory data from the GitHub Advisory Database (CC BY 4.0), Red Hat security data (CC BY 4.0) and the other sources linked on each entry. Entries may be summarised or re-formatted; the linked original is the authoritative record.