What’s Vulnerable › Vulnerabilities

CVE-2019-18197: Nokogiri affected by libxslt Use of Uninitialized Resource/Use After Free vulnerability

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 4.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-10-18 · updated 2026-06-17
• Weakness: CWE-416

Description

In xsltCopyText in transform.c in libxslt 1.1.33, a pointer variable isn't reset under certain circumstances. If the relevant memory area happened to be freed and reused in a certain way, a bounds check could fail and memory outside a buffer could be written to, or uninitialized data could be disclosed.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 19.04, 19.10
• Debian Linux: 8.0
• xmlsoft libxslt: 1.1.33
• Rubygems Nokogiri: before 1.10.5; 1.0.0, 1.0.1, 1.0.2, 1.0.3, 1.0.4, 1.0.5 (+108) — fixed in 1.10.5

How to fix

Upgrade to a fixed version: Rubygems Nokogiri 1.10.5. Check the vendor advisory for mitigations.

References

• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00010.html
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00015.html
• http://lists.opensuse.org/opensuse-security-announce/2020-02/msg00025.html
• http://lists.opensuse.org/opensuse-security-announce/2020-05/msg00062.html
• http://www.openwall.com/lists/oss-security/2019/11/17/2
• https://access.redhat.com/errata/RHSA-2020:0514
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15746
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15768
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=15914
• https://gitlab.gnome.org/GNOME/libxslt/commit/2232473733b7313d67de8836ea3b29eec6e8e285
• https://lists.debian.org/debian-lts-announce/2019/10/msg00037.html
• https://security.netapp.com/advisory/ntap-20191031-0004/

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