CVE-2017-18640

snakeyaml: Billion laughs attack via alias feature

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Severity

Moderate

Red Hat Product Security

7.6

CVSS 3.1

Review impact separately from score.

Published · December 12, 2019

Updated · November 2, 2026

Description

The Alias feature in SnakeYAML before 1.26 allows entity expansion during a load operation, a related issue to CVE-2003-1564.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7.6
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/A:H

CWE-776 · Improper Restriction of Recursive Entity References in DTDs