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NVD / CVE Program· CNA GitHub_M

CVE-2020-26247: Nokogiri is a Rubygem providing HTML, XML, SAX, and Reader parsers with XPath and CSS selector support.

Noroxi assessment

Priority: Monitor (action score 17/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 1.1% (FIRST EPSS); higher than 67.9% of all records.
  • Anyone who can reach it over the internet can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: ruby-nokogiri (Alpine:v3.14) 1.11.6-r0; ruby-nokogiri (Debian:10) 1.10.0+dfsg1-2+deb10u1; ruby-nokogiri (Debian:12) 1.11.1+dfsg-1.

Low priority for now. Upgrade to ruby-nokogiri (Alpine:v3.14) 1.11.6-r0; ruby-nokogiri (Debian:10) 1.10.0+dfsg1-2+deb10u1; ruby-nokogiri (Debian:12) 1.11.1+dfsg-1 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

Nokogiri is a Rubygem providing HTML, XML, SAX, and Reader parsers with XPath and CSS selector support. In Nokogiri before version 1.11.0.rc4 there is an XXE vulnerability. XML Schemas parsed by Nokogiri::XML::Schema are trusted by default, allowing external resources to be accessed over the network, potentially enabling XXE or SSRF attacks. This behavior is counter to the security policy followed by Nokogiri maintainers, which is to treat all input as untrusted by default whenever possible. This is fixed in Nokogiri version 1.11.0.rc4.

MediumCVSS 4.3 · v3.1—No exploit Fix available
Published
Dec 30, 2020
Updated
Jun 16, 2026
EPSS
1.1% · 67th percentile

Report tools

JSON

Action score

17

Monitor

Low priority for now.

CVSS
17 / 40 · 4.3 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 1.1%

CNA vs NVD score

NVD
4.3
CNA · GitHub_M
2.6
1.7 point gap

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

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
nokogirinokogiri
debiandebian linux

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • debian debian linux10.0
  • debian debian linux9.0
  • nokogiri nokogiribefore 1.11.0
  • nokogiri nokogiri1.11.0

Versions reported by the vendor

Affected version ranges reported by the assigning authority (GitHub_M). Independent of NVD's CPE analysis and usually ahead of it.

  • sparklemotion nokogiri

    • < 1.11.0.rc4affected

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Alpine:v3.14ruby-nokogiribefore 1.11.6-r01.11.6-r0
Debian:10ruby-nokogiribefore 1.10.0+dfsg1-2+deb10u11.10.0+dfsg1-2+deb10u1
Debian:12ruby-nokogiribefore 1.11.1+dfsg-11.11.1+dfsg-1
Debian:9ruby-nokogiribefore 1.6.8.1-1+deb9u11.6.8.1-1+deb9u1
openSUSE:Leap 15.2rubygem-nokogiribefore 1.8.5-lp152.4.3.11.8.5-lp152.4.3.1
Red Hat:satellite_capsule:6.10::el7foremanbefore 0:2.5.2.17-2.el7sat0:2.5.2.17-2.el7sat
Red Hat:satellite_capsule:6.10::el7python-aiohttpbefore 0:3.7.4-1.el7pc0:3.7.4-1.el7pc
Red Hat:satellite_capsule:6.10::el7python-ecdsabefore 0:0.13.3-2.el7pc0:0.13.3-2.el7pc
Red Hat:satellite_capsule:6.10::el7python-pyyamlbefore 0:5.4.1-1.el7pc0:5.4.1-1.el7pc
Red Hat:satellite_capsule:6.10::el7python-urllib3before 0:1.26.5-1.el7pc0:1.26.5-1.el7pc
Red Hat:satellite_capsule:6.10::el7python3-djangobefore 0:2.2.24-1.el7pc0:2.2.24-1.el7pc
Red Hat:satellite_capsule:6.10::el7python3-ecdsabefore 0:0.13.3-2.el7pc0:0.13.3-2.el7pc
Red Hat:satellite_capsule:6.10::el7python3-pyyamlbefore 0:5.4.1-1.el7pc0:5.4.1-1.el7pc
Red Hat:satellite_capsule:6.10::el7python3-urllib3before 0:1.26.5-1.el7pc0:1.26.5-1.el7pc
Red Hat:satellite_capsule:6.10::el7satellitebefore 0:6.10.0-3.el7sat0:6.10.0-3.el7sat
Red Hat:satellite_capsule:6.10::el7satellite-capsulebefore 0:6.10.0-3.el7sat0:6.10.0-3.el7sat
Red Hat:satellite_capsule:6.10::el7tfm-rubygem-nokogiribefore 0:1.11.3-2.el7sat0:1.11.3-2.el7sat
Red Hat:satellite:6.10::el7candlepinbefore 0:4.0.9-1.el7sat0:4.0.9-1.el7sat
Red Hat:satellite:6.10::el7tfm-rubygem-actionpackbefore 0:6.0.3.7-1.el7sat0:6.0.3.7-1.el7sat
Red Hat:satellite:6.10::el7tfm-rubygem-activerecord-session_storebefore 0:2.0.0-1.el7sat0:2.0.0-1.el7sat
Red Hat:satellite:6.10::el7tfm-rubygem-addressablebefore 0:2.8.0-1.el7sat0:2.8.0-1.el7sat
Red Hat:satellite:6.10::el7tfm-rubygem-pumabefore 0:5.3.2-1.el7sat0:5.3.2-1.el7sat
Red Hat:satellite:6.10::el7tfm-rubygem-railsbefore 0:6.0.3.7-1.el7sat0:6.0.3.7-1.el7sat
RubyGemsnokogiribefore 1.11.01.11.0

+58

Same product

nokogiri: all records

Other highest-scoring records for the same primary product.

  • CVE-2019-5477A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess via Ruby's `Kernel.open` me
    41Plan
  • CVE-2026-79770Nokogiri before 1.19.3 ReDoS via CSS selector tokenizer
    34Monitor
  • CVE-2022-29181Improper Handling of Unexpected Data Type in Nokogiri
    33Monitor

Published before and after this one in the same product

  • ← EarlierCVE-2013-6461Nov 5, 2019 · Nokogiri gem 1.5.x and 1.6.x has DoS while parsing XML entities by failing to apply limits
    27Monitor
  • ← EarlierCVE-2012-6685Feb 19, 2020 · Nokogiri before 1.5.4 is vulnerable to XXE attacks
    31Monitor
  • Later →CVE-2021-41098Sep 27, 2021 · Improper Restriction of XML External Entity Reference (XXE) in Nokogiri on JRuby
    30Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
alpine:ruby-nokogiri1.11.6-r0 · Alpine:v3.14Package registry (OSV)
debian:ruby-nokogiri1.11.1+dfsg-1 · Debian:12Package registry (OSV)
opensuse:rubygem-nokogiri1.8.5-lp152.4.3.1 · openSUSE:Leap 15.2Package registry (OSV)
red hat:candlepin0:4.0.9-1.el7sat · Red Hat:satellite:6.10::el7Package registry (OSV)
red hat:foreman0:2.5.2.17-2.el7sat · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
red hat:python-aiohttp0:3.7.4-1.el7pc · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
red hat:python-ecdsa0:0.13.3-2.el7pc · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
red hat:python-pyyaml0:5.4.1-1.el7pc · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
red hat:python3-ecdsa0:0.13.3-2.el7pc · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
red hat:python3-pyyaml0:5.4.1-1.el7pc · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
red hat:satellite0:6.10.0-3.el7sat · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
red hat:satellite-capsule0:6.10.0-3.el7sat · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
red hat:tfm-rubygem-actionpack0:6.0.3.7-1.el7sat · Red Hat:satellite:6.10::el7Package registry (OSV)
red hat:tfm-rubygem-activerecord-session_store0:2.0.0-1.el7sat · Red Hat:satellite:6.10::el7Package registry (OSV)
red hat:tfm-rubygem-nokogiri0:1.11.3-2.el7sat · Red Hat:satellite_capsule:6.10::el7Package registry (OSV)
RubyGems:nokogiri1.11.0Package registry (OSV)
suse:ardana-cobbler8.0+git.1614096566.e8c2b27-3.44.3 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:cassandra3.11.10-5.3.5 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-installation8.20210512-1.32.5 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-operations8.20210512-1.32.5 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-opsconsole8.20210512-1.32.5 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-planning8.20210512-1.32.5 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-security8.20210512-1.32.5 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:documentation-hpe-helion-openstack-user8.20210512-1.32.5 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:grafana6.7.4-4.18.2 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:kibana4.6.6-3.9.2 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:openstack-heat-templates0.0.0+git.1623056900.7917e18-3.21.3 · SUSE:HPE Helion OpenStack 8Package registry (OSV)
suse:rubygem-nokogiri1.6.1-5.3.1 · SUSE:OpenStack Cloud 7Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
low · data can be read
Integrity
none
Availability
none
Attack vector
Network
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
Low
Integrity impact
None
Availability impact
None

Weakness class (CWE)

CWE-611 · Improper Restriction of XML External Entity Reference

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records