CVE-2026-7210 (GCVE-0-2026-7210)
Vulnerability from cvelistv5 – Published: 2026-05-11 17:19 – Updated: 2026-08-14 00:28
VLAI
EPSS
VEX
Title
The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection
Summary
`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\r\n\r\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-05-11 18:53 UTC
CWE
- CWE-331 - Insufficient entropy
Assigner
References
12 references
Impacted products
1 product
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Python Software Foundation | CPython |
Affected:
0 , < 3.11.16
(python)
Affected: 3.12.0 , < 3.12.14 (python) Affected: 3.13.0 , < 3.13.14 (python) Affected: 3.14.0 , < 3.14.6 (python) Affected: 3.15.0a1 , < 3.15.0b2 (python) |
guessed |
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"type": "coordinator",
"value": "Stan Ulbrych (https://github.com/StanFromIreland)"
},
{
"lang": "en",
"type": "remediation reviewer",
"value": "Gregory P. Smith (https://github.com/gpshead)"
}
],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"type": "text/html",
"value": "`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\\r\\n\\r\\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch."
}
],
"value": "`xml.parsers.expat` and `xml.etree.ElementTree` use insufficient entropy for Expat hash-flooding protection, which allows a crafted XML document to trigger hash flooding.\\r\\n\\r\\nFully mitigating this vulnerability requires both updating libexpat to 2.8.0 or later and applying this patch."
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "HIGH",
"attackRequirements": "NONE",
"attackVector": "NETWORK",
"baseScore": 6.3,
"baseSeverity": "MEDIUM",
"exploitMaturity": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "LOW",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-331",
"description": "CWE-331 Insufficient entropy",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-08-14T00:28:32.364Z",
"orgId": "28c92f92-d60d-412d-b760-e73465c3df22",
"shortName": "PSF"
},
"references": [
{
"tags": [
"vendor-advisory"
],
"url": "https://mail.python.org/archives/list/security-announce@python.org/thread/PNY5OMBDPM2FRUZTWFFPJ6LISWKV627K/"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/pull/149023"
},
{
"tags": [
"issue-tracking"
],
"url": "https://github.com/python/cpython/issues/149018"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/24b8f12544468e4cedf5bfbe25442fcd495391e4"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/3573b3b1ecbd99030a0b18658e1bfece771b2566"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/eeea765cb9d8f1fc3d8918b272ac3c477983f27a"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/fc9b11ff49cbc82e6f917d07a61517a2b5f3145f"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/e37df2a6a71d6538698e2d3188a7c345b827640b"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/cbaecf9f16da611a646d507c1cbca265c588fc56"
},
{
"tags": [
"patch"
],
"url": "https://github.com/python/cpython/commit/ea70712d1a8508e14e9677d44f838dab04dc0286"
}
],
"source": {
"discovery": "UNKNOWN"
},
"title": "The expat and elementtree parsers use insufficient entropy for XML hash-flooding protection",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "28c92f92-d60d-412d-b760-e73465c3df22",
"assignerShortName": "PSF",
"cveId": "CVE-2026-7210",
"datePublished": "2026-05-11T17:19:09.784Z",
"dateReserved": "2026-04-27T14:43:40.042Z",
"dateUpdated": "2026-08-14T00:28:32.364Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
}
}
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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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