CVE-2026-53429 (GCVE-0-2026-53429)
Vulnerability from cvelistv5 – Published: 2026-06-29 19:07 – Updated: 2026-06-30 04:38- CWE-401 - Missing Release of Memory after Effective Lifetime
| URL | Tags |
|---|---|
| https://github.com/leandrocp/mdex_native/security… | vendor-advisoryrelated |
| https://cna.erlef.org/cves/CVE-2026-53429.html | related |
| https://osv.dev/vulnerability/EEF-CVE-2026-53429 | related |
| https://github.com/leandrocp/mdex_native/commit/c… | patch |
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| leandrocp | mdex |
Affected:
0.11.0 , < 0.12.3
(semver)
cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:* |
||
| leandrocp | mdex |
Affected:
81e4d14dd3aa5b206e395c7f372b9b413793015f , < 6ed94d905f97af188323f042698ae841c02293b4
(git)
cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:* |
||
| leandrocp | mdex_native |
Affected:
0.1.0 , < 0.2.3
(semver)
cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:* |
||
| leandrocp | mdex_native |
Affected:
956528c5e31746253347029e810a969ab916fd27 , < cbd927fb5061b488de8d90a8ef6df65718ca1fe6
(git)
cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:* |
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"value": "Missing Release of Memory after Effective Lifetime vulnerability in leandrocp mdex and mdex_native allows an attacker who controls a rendered document to cause a denial of service through unbounded native memory exhaustion.\n\nThe native rendering code permanently leaks memory when rendering a document that contains escaped-tag nodes. The conversion of each %MDEx.EscapedTag{} node into its native representation (From\u003cExEscapedTag\u003e for NodeValue in the Rust NIF) calls Box::leak on the caller-supplied literal string, which surrenders the backing allocation so that it lives for the entire lifetime of the operating system process and is never freed.\n\nBoth the byte length of each literal and the number of escaped-tag nodes in a document are attacker-controlled, and there is no size cap, rate limit, or string interning on this path. Every render of a document containing escaped-tag nodes therefore leaks literal_size x node_count bytes that can never be reclaimed, and repeated renders accumulate without bound. Rendering reaches this path through the public MDEx.to_html/1 entry point and any other API that renders a supplied %MDEx.Document{}.\n\nAny application that uses mdex (or mdex_native directly) to render documents derived from user-supplied content is affected. Because the leaked memory is never reclaimed for the life of the BEAM process, an attacker can drive resident memory upward without limit until the node exhausts memory and crashes, taking down every process on it.\n\nThe vulnerable native code originally shipped inside mdex (in native/comrak_nif/src/types/document.rs) and was later extracted into the separate mdex_native package (native/mdex_native_nif/src/types/document.rs), where it remains unpatched.\n\nThis issue affects mdex from 0.11.0 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3."
},
{
"lang": "es",
"value": "Vulnerabilidad de liberaci\u00f3n de memoria faltante despu\u00e9s de la vida \u00fatil efectiva en leandrocp mdex y mdex_native permite a un atacante que controla un documento renderizado causar una denegaci\u00f3n de servicio a trav\u00e9s del agotamiento ilimitado de la memoria nativa.\n\nEl c\u00f3digo de renderizado nativo fuga memoria permanentemente al renderizar un documento que contiene nodos de etiqueta escapada. La conversi\u00f3n de cada nodo %MDEx.EscapedTag{} en su representaci\u00f3n nativa (From[ExEscapedTag] para NodeValue en el NIF de Rust) llama a Box::leak en la cadena literal proporcionada por el llamador, lo que cede la asignaci\u00f3n de respaldo para que viva durante toda la vida \u00fatil del proceso del sistema operativo y nunca se libere.\n\nTanto la longitud en bytes de cada literal como el n\u00famero de nodos de etiqueta escapada en un documento est\u00e1n controlados por el atacante, y no hay l\u00edmite de tama\u00f1o, l\u00edmite de velocidad o internamiento de cadenas en esta ruta. Cada renderizado de un documento que contiene nodos de etiqueta escapada, por lo tanto, fuga literal_size x node_count bytes que nunca pueden ser reclamados, y los renderizados repetidos se acumulan sin l\u00edmite. El renderizado alcanza esta ruta a trav\u00e9s del punto de entrada p\u00fablico MDEx.to_html/1 y cualquier otra API que renderice un %MDEx.Document{} proporcionado.\n\nCualquier aplicaci\u00f3n que utilice mdex (o mdex_native directamente) para renderizar documentos derivados de contenido proporcionado por el usuario se ve afectada. Debido a que la memoria fugada nunca se reclama durante la vida \u00fatil del proceso BEAM, un atacante puede impulsar la memoria residente hacia arriba sin l\u00edmite hasta que el nodo agote la memoria y falle, derribando cada proceso en \u00e9l.\n\nEl c\u00f3digo nativo vulnerable se envi\u00f3 originalmente dentro de mdex (en native/comrak_nif/src/types/document.rs) y fue posteriormente extra\u00eddo en el paquete mdex_native separado (native/mdex_native_nif/src/types/document.rs), donde permanece sin parchear.\n\nEste problema afecta a mdex desde 0.11.0 antes de 0.12.3, y a mdex_native desde 0.1.0 antes de 0.2.3."
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"id": "CVE-2026-53429",
"lastModified": "2026-10-25T21:10:00.770",
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"Recovery": "NOT_DEFINED",
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"attackComplexity": "LOW",
"attackRequirements": "NONE",
"attackVector": "LOCAL",
"availabilityRequirement": "NOT_DEFINED",
"baseScore": 6.9,
"baseSeverity": "MEDIUM",
"confidentialityRequirement": "NOT_DEFINED",
"exploitMaturity": "NOT_DEFINED",
"integrityRequirement": "NOT_DEFINED",
"modifiedAttackComplexity": "NOT_DEFINED",
"modifiedAttackRequirements": "NOT_DEFINED",
"modifiedAttackVector": "NOT_DEFINED",
"modifiedPrivilegesRequired": "NOT_DEFINED",
"modifiedSubAvailabilityImpact": "NOT_DEFINED",
"modifiedSubConfidentialityImpact": "NOT_DEFINED",
"modifiedSubIntegrityImpact": "NOT_DEFINED",
"modifiedUserInteraction": "NOT_DEFINED",
"modifiedVulnAvailabilityImpact": "NOT_DEFINED",
"modifiedVulnConfidentialityImpact": "NOT_DEFINED",
"modifiedVulnIntegrityImpact": "NOT_DEFINED",
"privilegesRequired": "NONE",
"providerUrgency": "NOT_DEFINED",
"subAvailabilityImpact": "NONE",
"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
"valueDensity": "NOT_DEFINED",
"vectorString": "CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X",
"version": "4.0",
"vulnAvailabilityImpact": "HIGH",
"vulnConfidentialityImpact": "NONE",
"vulnIntegrityImpact": "NONE",
"vulnerabilityResponseEffort": "NOT_DEFINED"
},
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
}
],
"ssvcV203": [
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"ssvcData": {
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"options": [
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],
"role": "CISA Coordinator",
"timestamp": "2026-06-29T20:45:00.827777Z",
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},
"published": "2026-06-29T20:17:39.033",
"references": [
{
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"url": "https://cna.erlef.org/cves/CVE-2026-53429.html"
},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://github.com/leandrocp/mdex_native/commit/cbd927fb5061b488de8d90a8ef6df65718ca1fe6"
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{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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},
{
"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"url": "https://osv.dev/vulnerability/EEF-CVE-2026-53429"
},
{
"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"url": "https://github.com/leandrocp/mdex_native/security/advisories/GHSA-cmvp-gp9f-23xw"
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],
"sourceIdentifier": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
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"source": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"type": "Secondary"
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]
}
},
"vulnrichment": {
"containers": {
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{
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"providerMetadata": {
"dateUpdated": "2026-06-29T20:45:33.888Z",
"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
"shortName": "CISA-ADP"
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"references": [
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"tags": [
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"url": "https://github.com/leandrocp/mdex_native/security/advisories/GHSA-cmvp-gp9f-23xw"
}
],
"title": "CISA ADP Vulnrichment"
}
],
"cna": {
"affected": [
{
"collectionURL": "https://repo.hex.pm",
"cpes": [
"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*"
],
"defaultStatus": "unaffected",
"modules": [
"\u0027Elixir.MDEx\u0027",
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"packageName": "mdex",
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"product": "mdex",
"programFiles": [
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"programRoutines": [
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{
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{
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{
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],
"repo": "https://github.com/leandrocp/mdex",
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"versions": [
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},
{
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],
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{
"name": "\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2"
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{
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},
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],
"defaultStatus": "unaffected",
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],
"packageName": "leandrocp/mdex_native",
"packageURL": "pkg:github/leandrocp/mdex_native",
"product": "mdex_native",
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},
{
"name": "\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2"
},
{
"name": "\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2"
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],
"repo": "https://github.com/leandrocp/mdex_native",
"vendor": "leandrocp",
"versions": [
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]
}
],
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],
"credits": [
{
"lang": "en",
"type": "finder",
"value": "Peter Ullrich"
},
{
"lang": "en",
"type": "remediation developer",
"value": "Leandro Pereira"
},
{
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"type": "analyst",
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],
"descriptions": [
{
"lang": "en",
"supportingMedia": [
{
"base64": false,
"type": "text/html",
"value": "Missing Release of Memory after Effective Lifetime vulnerability in leandrocp mdex and mdex_native allows an attacker who controls a rendered document to cause a denial of service through unbounded native memory exhaustion.\u003cp\u003eThe native rendering code permanently leaks memory when rendering a document that contains escaped-tag nodes. The conversion of each \u003ctt\u003e%MDEx.EscapedTag{}\u003c/tt\u003e node into its native representation (\u003ctt\u003eFrom\u0026lt;ExEscapedTag\u0026gt; for NodeValue\u003c/tt\u003e in the Rust NIF) calls \u003ctt\u003eBox::leak\u003c/tt\u003e on the caller-supplied \u003ctt\u003eliteral\u003c/tt\u003e string, which surrenders the backing allocation so that it lives for the entire lifetime of the operating system process and is never freed.\u003c/p\u003e\u003cp\u003eBoth the byte length of each literal and the number of escaped-tag nodes in a document are attacker-controlled, and there is no size cap, rate limit, or string interning on this path. Every render of a document containing escaped-tag nodes therefore leaks \u003ctt\u003eliteral_size \u0026times; node_count\u003c/tt\u003e bytes that can never be reclaimed, and repeated renders accumulate without bound. Rendering reaches this path through the public \u003ctt\u003eMDEx.to_html/1\u003c/tt\u003e entry point and any other API that renders a supplied \u003ctt\u003e%MDEx.Document{}\u003c/tt\u003e.\u003c/p\u003e\u003cp\u003eAny application that uses \u003ctt\u003emdex\u003c/tt\u003e (or \u003ctt\u003emdex_native\u003c/tt\u003e directly) to render documents derived from user-supplied content is affected. Because the leaked memory is never reclaimed for the life of the BEAM process, an attacker can drive resident memory upward without limit until the node exhausts memory and crashes, taking down every process on it.\u003c/p\u003e\u003cp\u003eThe vulnerable native code originally shipped inside \u003ctt\u003emdex\u003c/tt\u003e (in \u003ctt\u003enative/comrak_nif/src/types/document.rs\u003c/tt\u003e) and was later extracted into the separate \u003ctt\u003emdex_native\u003c/tt\u003e package (\u003ctt\u003enative/mdex_native_nif/src/types/document.rs\u003c/tt\u003e), where it remains unpatched.\u003c/p\u003e\u003cp\u003eThis issue affects mdex from 0.11.0 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.\u003c/p\u003e"
}
],
"value": "Missing Release of Memory after Effective Lifetime vulnerability in leandrocp mdex and mdex_native allows an attacker who controls a rendered document to cause a denial of service through unbounded native memory exhaustion.\n\nThe native rendering code permanently leaks memory when rendering a document that contains escaped-tag nodes. The conversion of each %MDEx.EscapedTag{} node into its native representation (From\u003cExEscapedTag\u003e for NodeValue in the Rust NIF) calls Box::leak on the caller-supplied literal string, which surrenders the backing allocation so that it lives for the entire lifetime of the operating system process and is never freed.\n\nBoth the byte length of each literal and the number of escaped-tag nodes in a document are attacker-controlled, and there is no size cap, rate limit, or string interning on this path. Every render of a document containing escaped-tag nodes therefore leaks literal_size x node_count bytes that can never be reclaimed, and repeated renders accumulate without bound. Rendering reaches this path through the public MDEx.to_html/1 entry point and any other API that renders a supplied %MDEx.Document{}.\n\nAny application that uses mdex (or mdex_native directly) to render documents derived from user-supplied content is affected. Because the leaked memory is never reclaimed for the life of the BEAM process, an attacker can drive resident memory upward without limit until the node exhausts memory and crashes, taking down every process on it.\n\nThe vulnerable native code originally shipped inside mdex (in native/comrak_nif/src/types/document.rs) and was later extracted into the separate mdex_native package (native/mdex_native_nif/src/types/document.rs), where it remains unpatched.\n\nThis issue affects mdex from 0.11.0 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3."
}
],
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}
]
}
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"privilegesRequired": "NONE",
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"subConfidentialityImpact": "NONE",
"subIntegrityImpact": "NONE",
"userInteraction": "NONE",
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"format": "CVSS",
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}
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"type": "CWE"
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]
}
],
"providerMetadata": {
"dateUpdated": "2026-06-29T19:07:16.954Z",
"orgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"shortName": "EEF"
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},
{
"tags": [
"related"
],
"url": "https://cna.erlef.org/cves/CVE-2026-53429.html"
},
{
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"related"
],
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},
{
"tags": [
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}
],
"source": {
"discovery": "EXTERNAL"
},
"title": "Unbounded native memory leak in mdex escaped-tag rendering enables unauthenticated denial of service",
"x_generator": {
"engine": "cvelib 1.8.0"
}
}
},
"cveMetadata": {
"assignerOrgId": "6b3ad84c-e1a6-4bf7-a703-f496b71e49db",
"assignerShortName": "EEF",
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"datePublished": "2026-06-29T19:07:16.954Z",
"dateReserved": "2026-06-09T11:01:47.529Z",
"dateUpdated": "2026-06-29T20:45:38.367Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
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}
}
}
Drag nodes to arrange them. Double-click a related vulnerability to open it, or a source to visit its link. The Physics button on the left tunes the layout and the simulation; the legend at the bottom left hides or shows nodes by kind and by sighting type.
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.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
How durations are calculated
Following the VTEM framework (Black Hat USA 2015), time to patch starts when the vendor or a coordinator was informed, total time to patch at discovery, and disclosure to patch at public disclosure; vendor response time runs from the report to its acknowledgement. Time to exploit and time unpatched start at the earliest discovery or report, falling back to public disclosure. Unpatched time ends at the first recorded patch, or the calculation time when no patch is recorded. Exploitation to patch shows the interval between those two events; a published proof of concept is a public exploit, not exploitation.
Each result shows its source dates. A negative interval means the end event came first; when date-only inputs leave the order open, the result says so. Date-only inputs are approximate. The earliest evidence wins: KEV report dates and sightings are labelled as such. Records describing another vulnerability are listed but never calculated from, and a PoC alone does not establish exploitation. Missing patch evidence does not prove that no patch exists. Filters below change the event list only.
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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.
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.