# CVE-2026-126062: Nokogiri : Possible SSRF on JRuby when resolving external DTDs or entities with `NONET` set


- **Severity:** Low 3.7 (`CVSS:3.1/AV:N/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N`)
- **Exploited in the wild:** Not known
- **Fix available:** Yes
- **Published:** 10 Nov 2026
- **Updated:** 12 Nov 2026
- **Also known as:** AZL-113335, DEBIAN-CVE-2026-126062, GHSA-v995-44v6-5fqm, UBUNTU-CVE-2026-126062

## What is CVE-2026-126062?

CVE-2026-126062 is a low-severity vulnerability in sparklemotion nokogiri, published on 10 Nov 2026. 

### Official 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.

Weakness: CWE-918 (Server-Side Request Forgery), CWE-611 (Improper Restriction of XML External Entity Reference)

## Which versions are affected by CVE-2026-126062?

1 open source package ship an affected version, including nokogiri.


| Package | Ecosystem | Affected | Fixed in |
| --- | --- | --- | --- |
| `nokogiri` | RubyGems | All versions | 1.19.5 |

## How do I fix CVE-2026-126062?

Upgrade nokogiri to 1.19.5 or later.

## Is CVE-2026-126062 being exploited?

There is no known exploitation of CVE-2026-126062 in the wild and no public exploit code.

## Fix prompt for AI coding agents

```text
Check this codebase for CVE-2026-126062 and fix it if it is affected.

What it is: CVE-2026-126062 is a low-severity vulnerability in sparklemotion nokogiri, published on 10 Nov 2026. 
Exploitation: There is no known exploitation of CVE-2026-126062 in the wild and no public exploit code.

Affected packages and fixed versions:
- nokogiri (RubyGems): affected all versions; fixed in 1.19.5

Task:
1. Search the dependency manifests and lockfiles (for example package.json, package-lock.json, requirements.txt, poetry.lock, uv.lock, pom.xml, build.gradle, go.mod, Cargo.lock, Gemfile.lock) and any Dockerfiles for the affected packages, including transitive dependencies.
2. If an affected version is in use, upgrade it to the fixed version for its release line with the project's package manager, so the lockfile is regenerated. Prefer the smallest upgrade that fixes it.
3. If there is no fix, or the upgrade would break the build, do not guess: explain the risk and the safest workaround instead.
4. Run the tests and summarise what changed and why.
5. If nothing in the project is affected, say so and change nothing.

Reference: https://insights.sbomify.com/CVE-2026-126062/ (Markdown: https://insights.sbomify.com/CVE-2026-126062/index.md)
```

## Sources

- CVE record: https://www.cve.org/CVERecord?id=CVE-2026-126062
- NVD: https://nvd.nist.gov/vuln/detail/CVE-2026-126062
- OSV: https://osv.dev/vulnerability/CVE-2026-126062

---
From sbomify Insights: https://insights.sbomify.com/CVE-2026-126062/
Summaries are generated and may contain mistakes; the official description above is the record.