Investigate in your agent.

Turn this advisory into a focused investigation. Ask your agent to check your project’s versions, explain the evidence, and suggest a compatible fix.

Your agent needs remote MCP support and access to https://cve.new/mcp.

Read the setup guide

Skip to content
cve.newCreate a CVE report
Check your stack
CVE-2026-126062

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

Products / packages sparklemotion nokogiri · nokogiri

Published

Share

Severity and exploitation

Not in CISA KEVSource: LOW

KEV coverage does not rule out exploitation.

KEV checked 15/11/2026, 01:50:31 UTC
OSV · CVSS:3.1 · 3.7
Assessment vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
GitHub_M · CVSS:3.1 · 3.7
Assessment vectorCVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N
The headline uses the highest imported catalog score. Assessments can differ by source and CVSS version.

Severity

low3.7

CVSS measures technical severity, not the likelihood of an attack.

Known exploitation

Not listed in the checked CISA KEV catalog

Absence from CISA KEV does not rule out attacks.

Public exploit

Not established by this record

Missing evidence does not mean no public exploit exists.

Remediation

Package fixes recorded

Fix versions are recorded for 1 of 1 mapped packages. Check each release branch and any separate product guidance.

What this means

Nokogiri versions before 1.19.5 have a vulnerability where the NONET parse option does not block external DTDs and entities with short-form IPv4 hosts or absolute paths, potentially enabling SSRF. An application parsing untrusted XML with DTDLOAD, DTDVALID, or NOENT could be affected. Only JRuby is affected.

Summarized by @cf/meta/llama-3.3-70b-instruct-fp8-fast. Verify details against the original sources.

Attack conditions

No attack-condition excerpt has been identified here. Review the full source description and references for authentication, network access, and configuration requirements.

Review supporting sources →

Affected versions

Check the exact model, release, and any platform requirements against your installation.

sparklemotion · GitHub_M

nokogiri

1 range
GitHub_M version evidence

Compare with this publisher’s ranges. This does not inspect your installation.

affected

< 1.19.5

unaffected

unknown

Other versions: unknown

Packages

Compare each installed version with the publisher’s affected ranges. Where a fix is recorded, choose the appropriate release branch and test compatibility before upgrading.

nokogiri RubyGems
Affected range Recorded fix
Earlier releases before 1.19.5Ecosystem versions1.19.5

Version evidence: OSV · GHSA-v995-44v6-5fqm

View original version evidence (195 explicit versions)

What to do

Compare your installed product and version with the affected versions above. A matching product name alone does not confirm exposure.

Use the recorded fix for your release branch. Review the publisher’s instructions and test compatibility before upgrading.

cve.new guidance unless attributed to a publisher. This page does not inspect your installation.

Public exploit evidence

No public exploit reference is identified in the imported evidence. This is not a claim that no exploit exists.

Original source description

Read the full publisher description

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.

References

7 sources
sparklemotion/nokogiri · security/advisories/GHSA-v995-44v6-5fqm
Security advisoryGitHub_M
sparklemotion/nokogiri · pull request #3752
PatchGitHub_M
sparklemotion/nokogiri · commit 97f41b6
PatchGitHub_M
sparklemotion/nokogiri · commit e448ca2
PatchGitHub_M
rubysec/ruby-advisory-db · GHSA-v995-44v6-5fqm.yml
Source reference
sparklemotion/nokogiri · repository
Source reference
View 1 more references
sparklemotion/nokogiri · releases/tag/v1.19.5
Release notesGitHub_M

Inside the record

Evidence available

Package identity
Version evidence
Remediation guidance · not supplied
Weakness classification
Additional publishers

Describes the evidence in this view, not whether the product is safe.

Original records

CVE-2026-126062

View the latest unmodified CVE JSON from the official source. It may be newer than this imported page.

cve.new JSON →

Underlying weaknesses

The source’s classification of what caused the vulnerability.

CWE-611 ↗

CWE-611: Improper Restriction of XML External Entity Reference

GitHub_M

Related →
CWE-918 ↗

CWE-918: Server-Side Request Forgery

GitHub_M

Related →
Contributing organizations · 2
GitHub_M

Assigning organization

2026-11-10
CISA-ADP

Additional data publisher

2026-11-12

Timeline

All times UTC

  1. Advisory published

    Publication date supplied by the source.

  2. Source updated

    Latest modification date supplied by the source.

  3. Last imported by cve.new

    Latest catalog import, not the date we first saw this advisory.

What changed

Follow changes
  1. CVE · CVE-2026-126062

    Observed 2026-11-12T19:40:15.134Z · upstream updated 2026-11-12T18:01:54.547Z

    Prioritization updated

    before

    []

    after

    [
  {
    "source": "CISA-ADP",
    "type": "SSVC",
    "role": "CISA Coordinator",
    "timestamp": "2026-11-12T16:26:21.600157Z",
    "decisions": [
      {
        "name": "Exploitation",
        "value": "none"
      },
      {
        "name": "Automatable",
        "value": "no"
      },
      {
        "name": "Technical Impact",
        "value": "partial"
      }
    ]
  }
]

Large field values are marked as truncated previews. Original source snapshots remain retained.

Showing up to 50 most recent observed changes.