What’s Vulnerable › Vulnerabilities

CVE-2019-13117: Uninitialized read in Nokogiri gem

• Severity: medium (CVSS 5.3 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 6.5% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2019-07-01 · updated 2026-06-17
• Weakness: CWE-908

Description

In numbers.c in libxslt 1.1.33, an xsl:number with certain format strings could lead to a uninitialized read in xsltNumberFormatInsertNumbers. This could allow an attacker to discern whether a byte on the stack contains the characters A, a, I, i, or 0, or any other character.

Affected products

• Canonical Ubuntu Linux: 12.04, 14.04, 16.04, 18.04, 19.04, 19.10
• Debian Linux: 8.0
• Fedoraproject Fedora: 31
• openSUSE Leap: 15.1
• containers/openjdk: 8-update231
• 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/2020-05/msg00062.html
• http://www.openwall.com/lists/oss-security/2019/11/17/2
• https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=14471
• https://gitlab.gnome.org/GNOME/libxslt/commit/c5eb6cf3aba0af048596106ed839b4ae17ecbcb1
• https://lists.apache.org/thread.html/r58af02e294bd07f487e2c64ffc0a29b837db5600e33b6e698b9d696b%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.apache.org/thread.html/rf4c02775860db415b4955778a131c2795223f61cb8c6a450893651e4%40%3Cissues.bookkeeper.apache.org%3E
• https://lists.debian.org/debian-lts-announce/2019/07/msg00020.html
• https://lists.fedoraproject.org/archives/list/package-announce%40lists.fedoraproject.org/message/IOYJKXPQCUNBMMQJWYXOR6QRUJZHEDRZ/
• https://oss-fuzz.com/testcase-detail/5631739747106816
• https://security.netapp.com/advisory/ntap-20190806-0004/
• https://security.netapp.com/advisory/ntap-20200122-0003/
• https://usn.ubuntu.com/4164-1/

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