🚨 [security] Update nokogiri 1.18.8 → 1.18.9 (patch)

[depfu]

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🚨 Your current dependencies have known security vulnerabilities 🚨

This dependency update fixes known security vulnerabilities. Please see the details below and assess their impact carefully. We recommend to merge and deploy this as soon as possible!

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Here is everything you need to know about this update. Please take a good look at what changed and the test results before merging this pull request.

What changed?

↗️ nokogiri (indirect, 1.18.8 → 1.18.9) · Repo · Changelog

Security Advisories 🚨

🚨 Nokogiri patches vendored libxml2 to resolve multiple CVEs

Summary

Nokogiri v1.18.9 patches the vendored libxml2 to address CVE-2025-6021, CVE-2025-6170, CVE-2025-49794, CVE-2025-49795, and CVE-2025-49796.

Impact and severity

CVE-2025-6021

A flaw was found in libxml2's xmlBuildQName function, where integer overflows in buffer size calculations can lead to a stack-based buffer overflow. This issue can result in memory corruption or a denial of service when processing crafted input.

NVD claims a severity of 7.5 High (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/17d950ae

CVE-2025-6170

A flaw was found in the interactive shell of the xmllint command-line tool, used for parsing XML files. When a user inputs an overly long command, the program does not check the input size properly, which can cause it to crash. This issue might allow attackers to run harmful code in rare configurations without modern protections.

NVD claims a severity of 2.5 Low (CVSS:3.1/AV:L/AC:H/PR:N/UI:R/S:U/C:N/I:N/A:L)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/5e9ec5c1

CVE-2025-49794

A use-after-free vulnerability was found in libxml2. This issue occurs when parsing XPath elements under certain circumstances when the XML schematron has the <sch:name path="..."/> schema elements. This flaw allows a malicious actor to craft a malicious XML document used as input for libxml, resulting in the program's crash using libxml or other possible undefined behaviors.

NVD claims a severity of 9.1 Critical (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/81cef8c5

CVE-2025-49795

A NULL pointer dereference vulnerability was found in libxml2 when processing XPath XML expressions. This flaw allows an attacker to craft a malicious XML input to libxml2, leading to a denial of service.

NVD claims a severity of 7.5 High (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/62048278

CVE-2025-49796

A vulnerability was found in libxml2. Processing certain sch:name elements from the input XML file can trigger a memory corruption issue. This flaw allows an attacker to craft a malicious XML input file that can lead libxml to crash, resulting in a denial of service or other possible undefined behavior due to sensitive data being corrupted in memory.

NVD claims a severity of 9.1 Critical (CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:H)

Fixed by applying https://gitlab.gnome.org/GNOME/libxml2/-/commit/81cef8c5

Affected Versions

• Nokogiri < 1.18.9 when using CRuby (MRI) with vendored libxml2

Patched Versions

• Nokogiri >= 1.18.9

Mitigation

Upgrade to Nokogiri v1.18.9 or later.

Users who are unable to upgrade Nokogiri may also choose a more complicated mitigation: compile and link Nokogiri against patched external libxml2 libraries which will also address these same issues.

References

• #3526
• https://nvd.nist.gov/vuln/detail/CVE-2025-6021
• https://nvd.nist.gov/vuln/detail/CVE-2025-6170
• https://nvd.nist.gov/vuln/detail/CVE-2025-49794
• https://nvd.nist.gov/vuln/detail/CVE-2025-49795
• https://nvd.nist.gov/vuln/detail/CVE-2025-49796

Release Notes

1.18.9

v1.18.9 / 2025-07-20

Security

• [CRuby] Applied upstream libxml2 patches to address CVE-2025-6021, CVE-2025-6170, CVE-2025-49794, CVE-2025-49795, and CVE-2025-49796. See GHSA-353f-x4gh-cqq8 for more information.

sha256 checksums

5bcfdf7aa8d1056a7ad5e52e1adffc64ef53d12d0724fbc6f458a3af1a4b9e32  nokogiri-1.18.9-aarch64-linux-gnu.gem
55e9e6ca46c4ad1715e313f407d8481d15be1e3b65d9f8e52ba1c124d01676a7  nokogiri-1.18.9-aarch64-linux-musl.gem
eea3f1f06463ff6309d3ff5b88033c4948d0da1ab3cc0a3a24f63c4d4a763979  nokogiri-1.18.9-arm64-darwin.gem
fe611ae65880e445a9c0f650d52327db239f3488626df4173c05beafd161d46e  nokogiri-1.18.9-arm-linux-gnu.gem
935605e14c0ba17da18d203922440bf6c0676c602659278d855d4622d756a324  nokogiri-1.18.9-arm-linux-musl.gem
ac5a7d93fd0e3cef388800b037407890882413feccca79eb0272a2715a82fa33  nokogiri-1.18.9.gem
1fe5b7aa4a054eda689a969bb4e03999960a6ea806582d327207d687168bceb5  nokogiri-1.18.9-java.gem
6b4fc1523aa0370c78653e38c94cb50e7f3ab786425de66ba7ad24222c1164a3  nokogiri-1.18.9-x64-mingw-ucrt.gem
e0d2deb03d3d7af8016e8c9df5ff4a7d692159cefb135cbb6a4109f265652348  nokogiri-1.18.9-x86_64-darwin.gem
b52f5defedc53d14f71eeaaf990da66b077e1918a2e13088b6a96d0230f44360  nokogiri-1.18.9-x86_64-linux-gnu.gem
e69359d6240c17e64cc9f43970d54f13bfc7b8cc516b819228f687e953425e69  nokogiri-1.18.9-x86_64-linux-musl.gem

Does any of this look wrong? Please let us know.

Commits

See the full diff on Github. The new version differs by 3 commits:

• version bump to v1.18.9
• Apply upstream patches to address multiple vulnerabilities (#3526)
• Apply upstream patches to address multiple vulnerabilities

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