CVE-2026-126062: XXE (CVSS 3.7)

Description

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, on JRuby, applications that parse untrusted XML with DTDLOAD, DTDVALID, or NOENT can have the NONET restriction bypassed when an external DTD or entity uses a short-form IPv4 host or uses absolute paths resolved against a network URL. The resolver can treat these identifiers as local and send a network request, potentially enabling server-side request forgery. CRuby and default parse options are not affected. This issue is fixed in version 1.19.5.

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CVSS v3.1 Score

3.7

LOW

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

EPSS — Exploit Prediction

0.0038

Probability of exploitation

0.32%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

Weakness Type (CWE)

CWE-611 CWE-611

CWE-918 Server-Side Request Forgery (SSRF)

References

Other References

https://github.com/sparklemotion/nokogiri/commit/97f41b65f4ee0cac859b87f0b26d2648c4806cb8 https://github.com/sparklemotion/nokogiri/commit/e448ca2827a9198644610fb730259e12baacdeac https://github.com/sparklemotion/nokogiri/pull/3752 https://github.com/sparklemotion/nokogiri/releases/tag/v1.19.5 https://github.com/sparklemotion/nokogiri/security/advisories/GHSA-v995-44v6-5fqm

Frequently Asked Questions

What is CVE-2026-126062? +

Nokogiri is an open source XML and HTML library for the Ruby programming language. Prior to 1.19.5, on JRuby, applications that parse untrusted XML with DTDLOAD, DTDVALID, or NOENT can have the NONET restriction bypassed when an external DTD or entity uses a short-form IPv4 host or uses absolute paths resolved against a network URL. The resolver can treat these identifiers as local and send a network request, potentially enabling server-side request forgery. CRuby and default parse options are not affected. This issue is fixed in version 1.19.5. It has a CVSS v3.1 base score of 3.7 (LOW).

How severe is CVE-2026-126062? +

CVE-2026-126062 has a CVSS v3.1 score of 3.7 out of 10, rated LOW. This is a low-severity vulnerability with limited impact. The EPSS score is 0.0038, placing it in the 0th percentile for exploitation probability.

How do I check if I'm vulnerable to CVE-2026-126062? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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