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Low, CVSS 3.7amended

JRuby: NONET is bypassed for external DTDs and entities when the systemId uses a short-form IPv4 host

CVE-2026-126062GHSA-v995-44v6-5fqm

What to do

Vendor fix available. Upgrade each affected package to the fixed version on its release line (nokogiri 1.19.5), redeploy, then verify what is actually installed.

This page has no inventory attached, so it cannot say whether you are affected. A vendor fix is not proof that your deployment is fixed.

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Affected packages

  • RubyGems nokogiri

    Affected
    < 1.19.5
    Fixed in
    1.19.5

Sources

Severity and exploitation
Exploitation
No confirmed exploitation recorded. Patch Next marks exploitation only from CISA KEV.
CVSS
3.7 · CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
EPSS
No dated EPSS signal available.
Source description

As published by the source; long descriptions are shortened.

Summary On JRuby, the `NONET` parse option did not block an external DTD or entity whose system identifier used a short-form IPv4 host, such as `http://127.1/` or `http://169.254.43518/`, or was an absolute path such as `/x.dtd` in a document parsed from a network URL. An application that parses untrusted XML with `DTDLOAD`, `DTDVALID` or `NOENT` could be made to send network requests, potentially enabling SSRF. Nokogiri 1.19.5 applies the `XML::Schema` check from GHSA-8678-w3jw-xfc2: with `NONET` set, only local resources are loaded. Only JRuby is affected. Default parse options are not affected.

Severity The Nokogiri maintainers have evaluated this as low severity.

Mitigation Upgrade to Nokogiri 1.19.5 or later, or do not enable `DTDLOAD`, `DTDVALID` or `NOENT` for untrusted input.

Credit This issue was responsibly reported by @arpitjain099.

Dates and revisions
Published by the source
Last modified by the source
Source last checked
  1. Revision 2 · amended ·

    Amended from osv record GHSA-v995-44v6-5fqm

  2. Revision 1 · created ·

    Published from ghsa record GHSA-v995-44v6-5fqm

Agent brief

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# Patch Next advisory brief: CVE-2026-126062

Advisory: JRuby: NONET is bypassed for external DTDs and entities when the systemId uses a short-form IPv4 host
IDs: CVE-2026-126062, GHSA-v995-44v6-5fqm
Record: https://patchnext.com/advisories/cve-2026-126062 (revision 2, source checked 11 Nov 2026, 07:35 UTC)
Inventory: none attached. This brief comes from a public page and does not say whether any deployment is affected.
Severity: Low (CVSS 3.7)
Exploitation: no confirmed exploitation recorded. Patch Next confirms exploitation only from CISA KEV.
Vendor response: Vendor fix available; fixed versions by package: nokogiri 1.19.5. A vendor fix does not mean a deployment is fixed.

## Affected components
- RubyGems nokogiri: affected < 1.19.5; fixed in 1.19.5

## Suggested inspection (read-only)
- RubyGems nokogiri: check the installed version with your package manager.

## Supported action
Upgrade each affected component to a fixed version on its release line. For a transitive dependency, upgrade the parent package or add an override or constraint, then regenerate the lockfile. Redeploy every environment that ran an affected version.

## Required regression checks
- Run the test suite and a production build.
- Exercise the features that depend on nokogiri.
- Repeat the inspection and confirm that only fixed versions remain installed.

## Rollback considerations
- Keep the previous lockfile and deployment artifact. Rolling back reinstates the vulnerable version, so apply any documented mitigation while you fix forward.

## Unresolved questions
- Which deployments run an affected version?
- Exploitation status can change. Check again before lowering the priority.
- Mark the work resolved only after the fixed version is verified in production.

## Sources
- Verified: https://github.com/advisories/GHSA-v995-44v6-5fqm (GitHub-reviewed advisory GHSA-v995-44v6-5fqm lists affected ranges: RubyGems nokogiri >=0 <1.19.5)
- Verified: https://osv.dev/vulnerability/GHSA-v995-44v6-5fqm (OSV record GHSA-v995-44v6-5fqm lists affected ranges: RubyGems nokogiri >=0 <1.19.5 (fixed))

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