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Vulnerabilities

Vulnerability · CVE-2026-6653

libxml2: Use after free in xmlParseInternalSubset via improper entity resolution handling

Published Jun 22, 2026 · catalog updated Jun 22, 2026 · GNOME

Last checked Oct 27, 2026. A connected source was read within the last 7 days.

Check if you run it

No confirmed exploitation is on record for CVE-2026-6653. EPSS is 0.36%. Act only if a listed version of GNOME is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.

Same product and reporting

Severity
High7.0
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.36%
Remediation
Not established
Affected products
vendor GNOME libxml2

Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.

Are you affected?

Enter the version you run. The result uses only the ranges stored on this record.

The check returns affected, not affected, or incomplete. It does not guess a version that is missing from the record.

  • vendor GNOME libxml2version unspecified

How to fix CVE-2026-6653

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-6653. EPSS is 0.36%. Act only if a listed version of GNOME is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

CWE-416: Use After Free; CWE-611: XML External Entity (XXE). EPSS 0.36%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Jun 22, 2026 · CVE.org

    Updated

    Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.

  2. Oct 20, 2026 · CISA ICS Advisories

    Detected

    CVE-2026-6653 is listed by Hitachi Energy RTU500 Product.

Sources

  • CISA Cybersecurity AdvisoriesGovernment advisoryCVE-2026-6653

    View CSAF Summary Hitachi Energy is aware of vulnerabilities that affect RTU500 product versions listed in this document. These vulnerabilities if exploited can have impact on confidentiality, integrity and availability of the product. Please refer to the Recommended Immediate Ac

    cisa.gov
  • CISA ICS AdvisoriesGovernment advisoryCVE-2026-6653

    View CSAF Summary Hitachi Energy is aware of vulnerabilities that affect RTU500 product versions listed in this document. These vulnerabilities if exploited can have impact on confidentiality, integrity and availability of the product. Please refer to the Recommended Immediate Ac

    cisa.gov
  • CVE.orgVulnerability recordCVE-2026-6653

    Use After Free in libxml2's xmlParseInternalSubset from GNOME libxml2 version 2.9.11 to 2.11.0 allows a remote attacker to cause a denial-of-service via maliciously crafted XML input with improper entity resolution handling.

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-6653

    30-day exploitation probability 0.36%

    first.org

References

Freshness

Last verified in this catalog Oct 26, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.

  • CISA ICS AdvisoriesOct 27, 2026
  • CISA Cybersecurity AdvisoriesOct 23, 2026
  • CVE.orgOct 23, 2026
  • FIRST EPSSOct 23, 2026