CVE-2026-92106 (GCVE-0-2026-92106)
Vulnerability from cvelistv5 – Published: 2026-09-25 09:33 – Updated: 2026-09-25 12:41
VLAI
EPSS
VEX
Title
lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS
Summary
Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting') vulnerability in dashbitco lazy_html allows mutation XSS via a parse and serialize round-trip of attacker-supplied HTML.
LazyHTML.to_html/2 and LazyHTML.Tree.to_html/2 decide whether to escape an element's text from its tag name alone. A style or script element inside SVG or MathML foreign content is parsed with character references decoded, but is serialized as an HTML raw-text element, so its text is emitted unescaped. Encoded markup such as </style><img src=x onerror=...> inside <svg><style> therefore closes the element on re-parse and becomes live markup. Applications that parse untrusted HTML with lazy_html, filter the document or tree, and serialize it for display are affected, since the payload is a plain text node that no element or attribute filter sees.
This issue affects lazy_html: from 0.1.0 before 0.1.13.
Severity
SSVC
Exploitation: none
Automatable: no
Technical Impact: partial
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-09-25 12:35 UTC
CWE
- CWE-79 - Improper Neutralization of Input During Web Page Generation ('Cross-site Scripting')
Assigner
References
5 references
| URL | Tags |
|---|---|
| https://github.com/dashbitco/lazy_html/security/a… | relatedvendor-advisory |
| https://cna.erlef.org/cves/CVE-2026-92106.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-92106 | related |
| https://github.com/dashbitco/lazy_html/commit/1de… | related |
| https://github.com/dashbitco/lazy_html/commit/f32… | patch |
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| dashbitco | lazy_html |
Affected:
0.1.0 , < 0.1.13
(semver)
cpe:2.3:a:dashbitco:lazy_html:*:*:*:*:*:*:*:* |
||
| dashbitco | lazy_html |
Affected:
1dee15746c024916b3110af8b168c2f3b3065fbd , < f32c7fd6223225b68bc8691c78b6d4a77972f1d5
(git)
cpe:2.3:a:dashbitco:lazy_html:*:*:*:*:*:*:*:* |
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},
{
"name": "is_noescape_text_node"
}
],
"repo": "https://github.com/dashbitco/lazy_html",
"vendor": "dashbitco",
"versions": [
{
"lessThan": "0.1.13",
"status": "affected",
"version": "0.1.0",
"versionType": "semver"
}
]
},
{
"collectionURL": "https://github.com",
"cpes": [
"cpe:2.3:a:dashbitco:lazy_html:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.LazyHTML.Tree\u0027",
"\u0027Elixir.LazyHTML\u0027",
"\u0027Elixir.LazyHTML.NIF\u0027"
],
"packageName": "dashbitco/lazy_html",
"packageURL": "pkg:github/dashbitco/lazy_html",
"product": "lazy_html",
"programFiles": [
"lib/lazy_html/tree.ex",
"lib/lazy_html.ex",
"c_src/lazy_html.cpp"
],
"programRoutines": [
{
"name": "\u0027Elixir.LazyHTML.Tree\u0027:to_html/2"
},
{
"name": "\u0027Elixir.LazyHTML\u0027:to_html/2"
},
{
"name": "is_noescape_text_node"
}
],
"repo": "https://github.com/dashbitco/lazy_html",
"vendor": "dashbitco",
"versions": [
{
"lessThan": "f32c7fd6223225b68bc8691c78b6d4a77972f1d5",
"status": "affected",
"version": "1dee15746c024916b3110af8b168c2f3b3065fbd",
"versionType": "git"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:a:dashbitco:lazy_html:*:*:*:*:*:*:*:*",
"versionEndExcluding": "0.1.13",
"versionStartIncluding": "0.1.0",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
],
"operator": "AND"
}
],
"credits": [
{
"lang": "en",
"type": "reporter",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Jonatan K\u0142osko"
},
{
"lang": "en",
"type": "analyst",
"value": "Jonatan M\u00e4nnchen / EEF"
},
{
"lang": "en",
"type": "analyst",
"value": "Jos\u00e9 Valim"
}
],
"dateAssigned": "2026-09-24T13:39:50.000Z",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eImproper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) vulnerability in dashbitco lazy_html allows mutation XSS via a parse and serialize round-trip of attacker-supplied HTML.\u003c/p\u003e\n\u003cp\u003e\u003ccode\u003eLazyHTML.to_html/2\u003c/code\u003e and \u003ccode\u003eLazyHTML.Tree.to_html/2\u003c/code\u003e decide whether to escape an element\u0027s text from its tag name alone. A \u003ccode\u003estyle\u003c/code\u003e or \u003ccode\u003escript\u003c/code\u003e element inside SVG or MathML foreign content is parsed with character references decoded, but is serialized as an HTML raw-text element, so its text is emitted unescaped. Encoded markup such as \u003ccode\u003e\u0026amp;lt;/style\u0026amp;gt;\u0026amp;lt;img src=x onerror=...\u0026amp;gt;\u003c/code\u003e inside \u003ccode\u003e\u0026lt;svg\u0026gt;\u0026lt;style\u0026gt;\u003c/code\u003e therefore closes the element on re-parse and becomes live markup. Applications that parse untrusted HTML with lazy_html, filter the document or tree, and serialize it for display are affected, since the payload is a plain text node that no element or attribute filter sees.\u003c/p\u003e\n\u003cp\u003eThis issue affects lazy_html: from 0.1.0 before 0.1.13.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) vulnerability in dashbitco lazy_html allows mutation XSS via a parse and serialize round-trip of attacker-supplied HTML.\n\n`LazyHTML.to_html/2` and `LazyHTML.Tree.to_html/2` decide whether to escape an element\u0027s text from its tag name alone. A `style` or `script` element inside SVG or MathML foreign content is parsed with character references decoded, but is serialized as an HTML raw-text element, so its text is emitted unescaped. Encoded markup such as `\u0026lt;/style\u0026gt;\u0026lt;img src=x onerror=...\u0026gt;` inside `\u003csvg\u003e\u003cstyle\u003e` therefore closes the element on re-parse and becomes live markup. Applications that parse untrusted HTML with lazy_html, filter the document or tree, and serialize it for display are affected, since the payload is a plain text node that no element or attribute filter sees.\n\nThis issue affects lazy_html: from 0.1.0 before 0.1.13."
}
],
"value": "Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027) vulnerability in dashbitco lazy_html allows mutation XSS via a parse and serialize round-trip of attacker-supplied HTML.\n\nLazyHTML.to_html/2 and LazyHTML.Tree.to_html/2 decide whether to escape an element\u0027s text from its tag name alone. A style or script element inside SVG or MathML foreign content is parsed with character references decoded, but is serialized as an HTML raw-text element, so its text is emitted unescaped. Encoded markup such as \u0026lt;/style\u0026gt;\u0026lt;img src=x onerror=...\u0026gt; inside \u003csvg\u003e\u003cstyle\u003e therefore closes the element on re-parse and becomes live markup. Applications that parse untrusted HTML with lazy_html, filter the document or tree, and serialize it for display are affected, since the payload is a plain text node that no element or attribute filter sees.\n\nThis issue affects lazy_html: from 0.1.0 before 0.1.13."
}
],
"impacts": [
{
"capecId": "CAPEC-63",
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "\u003cp\u003eAn attacker who can submit HTML to an application that sanitizes it with lazy_html can run script in the browsers of users who view the sanitized output.\u003c/p\u003e"
},
{
"base64": false,
"type": "text/markdown",
"value": "An attacker who can submit HTML to an application that sanitizes it with lazy_html can run script in the browsers of users who view the sanitized output."
}
],
"value": "An attacker who can submit HTML to an application that sanitizes it with lazy_html can run script in the browsers of users who view the sanitized output."
}
]
}
],
"metrics": [
{
"cvssV4_0": {
"Automatable": "NOT_DEFINED",
"Recovery": "NOT_DEFINED",
"Safety": "NOT_DEFINED",
"attackComplexity": "LOW",
"attackRequirements": "PRESENT",
"attackVector": "NETWORK",
"baseScore": 2.3,
"baseSeverity": "LOW",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "LOW",
"subIntegrityImpact": "LOW",
"userInteraction": "PASSIVE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:P/VC:N/VI:N/VA:N/SC:L/SI:L/SA:N",
"version": "4.0",
"vulnAvailabilityImpact": "NONE",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"format": "CVSS",
"scenarios": [
{
"lang": "en",
"value": "GENERAL"
}
]
}
],
"problemTypes": [
{
"descriptions": [
{
"cweId": "CWE-79",
"description": "CWE-79 Improper Neutralization of Input During Web Page Generation (\u0027Cross-site Scripting\u0027)",
"lang": "en",
"type": "CWE"
}
]
}
],
"providerMetadata": {
"dateUpdated": "2026-09-25T09:33:13.051Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
},
"references": [
{
"name": "GitHub Advisory",
"tags": [
"related",
"vendor-advisory"
],
"url": "https://github.com/dashbitco/lazy_html/security/advisories/GHSA-8rqp-v692-v82q"
},
{
"name": "EEF CNA record for CVE-2026-92106",
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-92106.html"
},
{
"name": "OSV record EEF-CVE-2026-92106",
"tags": [
"related"
],
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-92106"
},
{
"name": "Introducing commit 1dee157 in dashbitco/lazy_html",
"tags": [
"related"
],
"url": "https://github.com/dashbitco/lazy_html/commit/1dee15746c024916b3110af8b168c2f3b3065fbd"
},
{
"name": "Fix commit f32c7fd in dashbitco/lazy_html",
"tags": [
"patch"
],
"url": "https://github.com/dashbitco/lazy_html/commit/f32c7fd6223225b68bc8691c78b6d4a77972f1d5"
}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "lazy_html serializes SVG and MathML style and script text unescaped, allowing mutation XSS"
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
"cveId": "CVE-2026-92106",
"datePublished": "2026-09-25T09:33:13.051Z",
"dateReserved": "2026-09-21T12:15:01.326Z",
"dateUpdated": "2026-09-25T12:41:30.597Z",
"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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