CVE-2026-26278 (GCVE-0-2026-26278)

Vulnerability from cvelistv5 – Published: 2026-02-19 19:40 – Updated: 2026-07-17 12:04
VLAI
Title
fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)
Summary
fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it’s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
SSVC
Exploitation: none Automatable: yes Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-776 - Improper Restriction of Recursive Entity References in DTDs ('XML Entity Expansion')
Assigner
References
Impacted products
Vendor Product Version
NaturalIntelligence fast-xml-parser Affected: >= 5.0.0, < 5.3.6
Affected: >= 4.1.3, < 4.5.4
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.8 Unaffected: 1775594119 , < * (rpm)
    cpe:/a:redhat:advanced_cluster_security:4.8::el8
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Red Hat Red Hat Advanced Cluster Security for Kubernetes 4.9 Unaffected: 1775594284 , < * (rpm)
    cpe:/a:redhat:advanced_cluster_security:4.9::el8
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Red Hat Red Hat Developer Hub 1.8 Unaffected: 1774545605 , < * (rpm)
    cpe:/a:redhat:rhdh:1.8::el9
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Red Hat Red Hat Developer Hub 1.9 Unaffected: 1775140647 , < * (rpm)
    cpe:/a:redhat:rhdh:1.9::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667125 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783666755 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1784054598 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1784055387 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1784055726 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667517 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667577 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667611 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1784055020 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667641 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1784055586 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667790 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667859 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667875 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667869 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783667877 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1784055576 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1784055244 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1784055382 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783668266 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783668288 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Red Hat Openshift Data Foundation 4.20 Unaffected: 1783669219 , < * (rpm)
    cpe:/a:redhat:openshift_data_foundation:4.20::el9
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Red Hat Migration Toolkit for Applications 8     cpe:/a:redhat:migration_toolkit_applications:8
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Red Hat Red Hat OpenShift GitOps     cpe:/a:redhat:openshift_gitops:1
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Red Hat Red Hat OpenShift Virtualization 4     cpe:/a:redhat:container_native_virtualization:4
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Red Hat Red Hat Satellite 6     cpe:/a:redhat:satellite:6
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Red Hat Self-service automation portal 2     cpe:/a:redhat:ansible_portal:2
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This can lead to the application freezing for an extended period, resulting in a Denial of Service (DoS).\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-776\", \"description\": \"Improper Restriction of Recursive Entity References in DTDs (\u0027XML Entity Expansion\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-07-17T12:04:41.841Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-26278\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-02-19T20:58:40.378859Z\"}}}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-02-19T20:58:41.932Z\"}}], \"cna\": {\"title\": \"fast-xml-parser affected by DoS through entity expansion in DOCTYPE (no expansion limit)\", \"source\": {\"advisory\": \"GHSA-jmr7-xgp7-cmfj\", \"discovery\": \"UNKNOWN\"}, \"metrics\": [{\"cvssV3_1\": {\"scope\": \"UNCHANGED\", \"version\": \"3.1\", \"baseScore\": 7.5, \"attackVector\": \"NETWORK\", \"baseSeverity\": \"HIGH\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H\", \"integrityImpact\": \"NONE\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"availabilityImpact\": \"HIGH\", \"privilegesRequired\": \"NONE\", \"confidentialityImpact\": \"NONE\"}}], \"affected\": [{\"vendor\": \"NaturalIntelligence\", \"product\": \"fast-xml-parser\", \"versions\": [{\"status\": \"affected\", \"version\": \"\u003e= 5.0.0, \u003c 5.3.6\"}, {\"status\": \"affected\", \"version\": \"\u003e= 4.1.3, \u003c 4.5.4\"}]}], \"references\": [{\"url\": \"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-jmr7-xgp7-cmfj\", \"name\": \"https://github.com/NaturalIntelligence/fast-xml-parser/security/advisories/GHSA-jmr7-xgp7-cmfj\", \"tags\": [\"x_refsource_CONFIRM\"]}, {\"url\": \"https://github.com/NaturalIntelligence/fast-xml-parser/commit/910dae5be2de2955e968558fadf6e8f74f117a77\", \"name\": \"https://github.com/NaturalIntelligence/fast-xml-parser/commit/910dae5be2de2955e968558fadf6e8f74f117a77\", \"tags\": [\"x_refsource_MISC\"]}, {\"url\": \"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.6\", \"name\": \"https://github.com/NaturalIntelligence/fast-xml-parser/releases/tag/v5.3.6\", \"tags\": [\"x_refsource_MISC\"]}], \"descriptions\": [{\"lang\": \"en\", \"value\": \"fast-xml-parser allows users to validate XML, parse XML to JS object, or build XML from JS object without C/C++ based libraries and no callback. In versions 4.1.3 through 5.3.5, the XML parser can be forced to do an unlimited amount of entity expansion. With a very small XML input, it\\u2019s possible to make the parser spend seconds or even minutes processing a single request, effectively freezing the application. Version 5.3.6 fixes the issue. As a workaround, avoid using DOCTYPE parsing by `processEntities: false` option.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-776\", \"description\": \"CWE-776: Improper Restriction of Recursive Entity References in DTDs (\u0027XML Entity Expansion\u0027)\"}]}], \"providerMetadata\": {\"orgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"shortName\": \"GitHub_M\", \"dateUpdated\": \"2026-03-02T19:11:59.388Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-26278\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-07-17T12:04:41.841Z\", \"dateReserved\": \"2026-02-12T17:10:53.414Z\", \"assignerOrgId\": \"a0819718-46f1-4df5-94e2-005712e83aaa\", \"datePublished\": \"2026-02-19T19:40:55.842Z\", \"assignerShortName\": \"GitHub_M\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.