Security Digest · Critical advisory (no CVE assigned)
GHSA-353f-x4gh-cqq8: 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.
GitHub-reviewed · critical
Should you act?
- Only if you depend on one of the packages below, directly or transitively, in a vulnerable version. Check your lockfile with
bundle audit check --update. - No CVE has been assigned, so it will not appear in CVE-based scanners that ignore GitHub advisories.
npm audit,pip-auditand Dependabot do read GitHub advisories.
Affected packages
| Ecosystem | Package | Vulnerable | First fixed |
|---|---|---|---|
| RubyGems | nokogiri | < 1.18.9 | 1.18.9 |
Details
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
Sources and references
- GitHub Advisory GHSA-353f-x4gh-cqq8 github.com
- github.com github.com
- nvd.nist.gov nvd.nist.gov
- nvd.nist.gov nvd.nist.gov
- nvd.nist.gov nvd.nist.gov
- nvd.nist.gov nvd.nist.gov
- nvd.nist.gov nvd.nist.gov
- github.com github.com