CVE-2026-53429 (GCVE-0-2026-53429)

Vulnerability from cvelistv5 – Published: 2026-06-29 19:07 – Updated: 2026-06-30 04:38
VLAI
Title
Unbounded native memory leak in mdex escaped-tag rendering enables unauthenticated denial of service
Summary
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. The 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<ExEscapedTag> 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. Both 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{}. Any 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. The 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. This issue affects mdex from 0.11.0 before 0.12.3, and mdex_native from 0.1.0 before 0.2.3.
SSVC
Exploitation: poc Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
CWE
  • CWE-401 - Missing Release of Memory after Effective Lifetime
Assigner
EEF
Impacted products
Vendor Product Version
leandrocp mdex Affected: 0.11.0 , < 0.12.3 (semver)
    cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*
Create a notification for this product.
leandrocp mdex Affected: 81e4d14dd3aa5b206e395c7f372b9b413793015f , < 6ed94d905f97af188323f042698ae841c02293b4 (git)
    cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*
Create a notification for this product.
leandrocp mdex_native Affected: 0.1.0 , < 0.2.3 (semver)
    cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*
Create a notification for this product.
leandrocp mdex_native Affected: 956528c5e31746253347029e810a969ab916fd27 , < cbd927fb5061b488de8d90a8ef6df65718ca1fe6 (git)
    cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*
Create a notification for this product.
Credits
Peter Ullrich Leandro Pereira Jonatan Männchen / EEF
Show details on NVD website

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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.\"}],\"affected\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"affectedData\":[{\"vendor\":\"leandrocp\",\"product\":\"mdex\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://repo.hex.pm\",\"packageName\":\"mdex\",\"cpes\":[\"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.MDEx\u0027\",\"comrak_nif\"],\"programFiles\":[\"native/comrak_nif/src/types/document.rs\"],\"programRoutines\":[{\"name\":\"comrak_nif::document_to_html_with_options\"},{\"name\":\"\u0027Elixir.MDEx.Native\u0027:document_to_html_with_options/2\"},{\"name\":\"\u0027Elixir.MDEx\u0027:to_html/1\"}],\"repo\":\"https://github.com/leandrocp/mdex\",\"packageURL\":\"pkg:hex/mdex\",\"versions\":[{\"version\":\"0.11.0\",\"lessThan\":\"0.12.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"leandrocp\",\"product\":\"mdex\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com\",\"packageName\":\"leandrocp/mdex\",\"cpes\":[\"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.MDEx\u0027\",\"comrak_nif\"],\"programFiles\":[\"native/comrak_nif/src/types/document.rs\"],\"programRoutines\":[{\"name\":\"comrak_nif::document_to_html_with_options\"},{\"name\":\"\u0027Elixir.MDEx.Native\u0027:document_to_html_with_options/2\"},{\"name\":\"\u0027Elixir.MDEx\u0027:to_html/1\"}],\"repo\":\"https://github.com/leandrocp/mdex\",\"packageURL\":\"pkg:github/leandrocp/mdex\",\"versions\":[{\"version\":\"81e4d14dd3aa5b206e395c7f372b9b413793015f\",\"lessThan\":\"6ed94d905f97af188323f042698ae841c02293b4\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"leandrocp\",\"product\":\"mdex_native\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://repo.hex.pm\",\"packageName\":\"mdex_native\",\"cpes\":[\"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.MDExNative.Comrak\u0027\",\"mdex_native_nif\"],\"programFiles\":[\"native/mdex_native_nif/src/types/document.rs\"],\"programRoutines\":[{\"name\":\"mdex_native_nif::document_to_html_with_options\"},{\"name\":\"\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2\"},{\"name\":\"\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2\"}],\"repo\":\"https://github.com/leandrocp/mdex_native\",\"packageURL\":\"pkg:hex/mdex_native\",\"versions\":[{\"version\":\"0.1.0\",\"lessThan\":\"0.2.3\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"leandrocp\",\"product\":\"mdex_native\",\"defaultStatus\":\"unaffected\",\"collectionURL\":\"https://github.com\",\"packageName\":\"leandrocp/mdex_native\",\"cpes\":[\"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\"],\"modules\":[\"\u0027Elixir.MDExNative.Comrak\u0027\",\"mdex_native_nif\"],\"programFiles\":[\"native/mdex_native_nif/src/types/document.rs\"],\"programRoutines\":[{\"name\":\"mdex_native_nif::document_to_html_with_options\"},{\"name\":\"\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2\"},{\"name\":\"\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2\"}],\"repo\":\"https://github.com/leandrocp/mdex_native\",\"packageURL\":\"pkg:github/leandrocp/mdex_native\",\"versions\":[{\"version\":\"956528c5e31746253347029e810a969ab916fd27\",\"lessThan\":\"cbd927fb5061b488de8d90a8ef6df65718ca1fe6\",\"versionType\":\"git\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV40\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"4.0\",\"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\",\"baseScore\":6.9,\"baseSeverity\":\"MEDIUM\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"attackRequirements\":\"NONE\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"vulnConfidentialityImpact\":\"NONE\",\"vulnIntegrityImpact\":\"NONE\",\"vulnAvailabilityImpact\":\"HIGH\",\"subConfidentialityImpact\":\"NONE\",\"subIntegrityImpact\":\"NONE\",\"subAvailabilityImpact\":\"NONE\",\"exploitMaturity\":\"NOT_DEFINED\",\"confidentialityRequirement\":\"NOT_DEFINED\",\"integrityRequirement\":\"NOT_DEFINED\",\"availabilityRequirement\":\"NOT_DEFINED\",\"modifiedAttackVector\":\"NOT_DEFINED\",\"modifiedAttackComplexity\":\"NOT_DEFINED\",\"modifiedAttackRequirements\":\"NOT_DEFINED\",\"modifiedPrivilegesRequired\":\"NOT_DEFINED\",\"modifiedUserInteraction\":\"NOT_DEFINED\",\"modifiedVulnConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedVulnIntegrityImpact\":\"NOT_DEFINED\",\"modifiedVulnAvailabilityImpact\":\"NOT_DEFINED\",\"modifiedSubConfidentialityImpact\":\"NOT_DEFINED\",\"modifiedSubIntegrityImpact\":\"NOT_DEFINED\",\"modifiedSubAvailabilityImpact\":\"NOT_DEFINED\",\"Safety\":\"NOT_DEFINED\",\"Automatable\":\"NOT_DEFINED\",\"Recovery\":\"NOT_DEFINED\",\"valueDensity\":\"NOT_DEFINED\",\"vulnerabilityResponseEffort\":\"NOT_DEFINED\",\"providerUrgency\":\"NOT_DEFINED\"}}],\"ssvcV203\":[{\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\",\"ssvcData\":{\"timestamp\":\"2026-06-29T20:45:00.827777Z\",\"id\":\"CVE-2026-53429\",\"options\":[{\"exploitation\":\"poc\"},{\"automatable\":\"no\"},{\"technicalImpact\":\"partial\"}],\"role\":\"CISA Coordinator\",\"version\":\"2.0.3\"}}]},\"weaknesses\":[{\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\",\"type\":\"Secondary\",\"description\":[{\"lang\":\"en\",\"value\":\"CWE-401\"}]}],\"references\":[{\"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\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/leandrocp/mdex_native/security/advisories/GHSA-cmvp-gp9f-23xw\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://osv.dev/vulnerability/EEF-CVE-2026-53429\",\"source\":\"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\"},{\"url\":\"https://github.com/leandrocp/mdex_native/security/advisories/GHSA-cmvp-gp9f-23xw\",\"source\":\"134c704f-9b21-4f2e-91b3-4a467353bcc0\"}]}}",
    "vulnrichment": {
      "containers": "{\"adp\": [{\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-53429\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"poc\"}, {\"Automatable\": \"no\"}, {\"Technical Impact\": \"partial\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-06-29T20:45:00.827777Z\"}}}], \"references\": [{\"url\": \"https://github.com/leandrocp/mdex_native/security/advisories/GHSA-cmvp-gp9f-23xw\", \"tags\": [\"exploit\"]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-06-29T20:45:33.888Z\"}}], \"cna\": {\"title\": \"Unbounded native memory leak in mdex escaped-tag rendering enables unauthenticated denial of service\", \"source\": {\"discovery\": \"EXTERNAL\"}, \"credits\": [{\"lang\": \"en\", \"type\": \"finder\", \"value\": \"Peter Ullrich\"}, {\"lang\": \"en\", \"type\": \"remediation developer\", \"value\": \"Leandro Pereira\"}, {\"lang\": \"en\", \"type\": \"analyst\", \"value\": \"Jonatan M\\u00e4nnchen / EEF\"}], \"impacts\": [{\"capecId\": \"CAPEC-130\", \"descriptions\": [{\"lang\": \"en\", \"value\": \"CAPEC-130 Excessive Allocation\"}]}], \"metrics\": [{\"format\": \"CVSS\", \"cvssV4_0\": {\"version\": \"4.0\", \"baseScore\": 6.9, \"attackVector\": \"LOCAL\", \"baseSeverity\": \"MEDIUM\", \"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\", \"userInteraction\": \"NONE\", \"attackComplexity\": \"LOW\", \"attackRequirements\": \"NONE\", \"privilegesRequired\": \"NONE\", \"subIntegrityImpact\": \"NONE\", \"vulnIntegrityImpact\": \"NONE\", \"subAvailabilityImpact\": \"NONE\", \"vulnAvailabilityImpact\": \"HIGH\", \"subConfidentialityImpact\": \"NONE\", \"vulnConfidentialityImpact\": \"NONE\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"GENERAL\"}]}], \"affected\": [{\"cpes\": [\"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/leandrocp/mdex\", \"vendor\": \"leandrocp\", \"modules\": [\"\u0027Elixir.MDEx\u0027\", \"comrak_nif\"], \"product\": \"mdex\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.11.0\", \"lessThan\": \"0.12.3\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/mdex\", \"packageName\": \"mdex\", \"programFiles\": [\"native/comrak_nif/src/types/document.rs\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"comrak_nif::document_to_html_with_options\"}, {\"name\": \"\u0027Elixir.MDEx.Native\u0027:document_to_html_with_options/2\"}, {\"name\": \"\u0027Elixir.MDEx\u0027:to_html/1\"}]}, {\"cpes\": [\"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/leandrocp/mdex\", \"vendor\": \"leandrocp\", \"modules\": [\"\u0027Elixir.MDEx\u0027\", \"comrak_nif\"], \"product\": \"mdex\", \"versions\": [{\"status\": \"affected\", \"version\": \"81e4d14dd3aa5b206e395c7f372b9b413793015f\", \"lessThan\": \"6ed94d905f97af188323f042698ae841c02293b4\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/leandrocp/mdex\", \"packageName\": \"leandrocp/mdex\", \"programFiles\": [\"native/comrak_nif/src/types/document.rs\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"comrak_nif::document_to_html_with_options\"}, {\"name\": \"\u0027Elixir.MDEx.Native\u0027:document_to_html_with_options/2\"}, {\"name\": \"\u0027Elixir.MDEx\u0027:to_html/1\"}]}, {\"cpes\": [\"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/leandrocp/mdex_native\", \"vendor\": \"leandrocp\", \"modules\": [\"\u0027Elixir.MDExNative.Comrak\u0027\", \"mdex_native_nif\"], \"product\": \"mdex_native\", \"versions\": [{\"status\": \"affected\", \"version\": \"0.1.0\", \"lessThan\": \"0.2.3\", \"versionType\": \"semver\"}], \"packageURL\": \"pkg:hex/mdex_native\", \"packageName\": \"mdex_native\", \"programFiles\": [\"native/mdex_native_nif/src/types/document.rs\"], \"collectionURL\": \"https://repo.hex.pm\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"mdex_native_nif::document_to_html_with_options\"}, {\"name\": \"\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2\"}, {\"name\": \"\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2\"}]}, {\"cpes\": [\"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\"], \"repo\": \"https://github.com/leandrocp/mdex_native\", \"vendor\": \"leandrocp\", \"modules\": [\"\u0027Elixir.MDExNative.Comrak\u0027\", \"mdex_native_nif\"], \"product\": \"mdex_native\", \"versions\": [{\"status\": \"affected\", \"version\": \"956528c5e31746253347029e810a969ab916fd27\", \"lessThan\": \"cbd927fb5061b488de8d90a8ef6df65718ca1fe6\", \"versionType\": \"git\"}], \"packageURL\": \"pkg:github/leandrocp/mdex_native\", \"packageName\": \"leandrocp/mdex_native\", \"programFiles\": [\"native/mdex_native_nif/src/types/document.rs\"], \"collectionURL\": \"https://github.com\", \"defaultStatus\": \"unaffected\", \"programRoutines\": [{\"name\": \"mdex_native_nif::document_to_html_with_options\"}, {\"name\": \"\u0027Elixir.MDExNative.Native\u0027:document_to_html_with_options/2\"}, {\"name\": \"\u0027Elixir.MDExNative.Comrak\u0027:document_to_html/2\"}]}], \"references\": [{\"url\": \"https://github.com/leandrocp/mdex_native/security/advisories/GHSA-cmvp-gp9f-23xw\", \"tags\": [\"vendor-advisory\", \"related\"]}, {\"url\": \"https://cna.erlef.org/cves/CVE-2026-53429.html\", \"tags\": [\"related\"]}, {\"url\": \"https://osv.dev/vulnerability/EEF-CVE-2026-53429\", \"tags\": [\"related\"]}, {\"url\": \"https://github.com/leandrocp/mdex_native/commit/cbd927fb5061b488de8d90a8ef6df65718ca1fe6\", \"tags\": [\"patch\"]}], \"x_generator\": {\"engine\": \"cvelib 1.8.0\"}, \"descriptions\": [{\"lang\": \"en\", \"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.\", \"supportingMedia\": [{\"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\", \"base64\": false}]}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-401\", \"description\": \"CWE-401 Missing Release of Memory after Effective Lifetime\"}]}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.12.3\", \"versionStartIncluding\": \"0.11.0\"}], \"operator\": \"AND\"}, {\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"0.2.3\", \"versionStartIncluding\": \"0.1.0\"}], \"operator\": \"AND\"}], \"operator\": \"OR\"}], \"providerMetadata\": {\"orgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"shortName\": \"EEF\", \"dateUpdated\": \"2026-06-30T04:38:14.140Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-53429\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-06-30T04:38:14.140Z\", \"dateReserved\": \"2026-06-09T11:01:47.529Z\", \"assignerOrgId\": \"6b3ad84c-e1a6-4bf7-a703-f496b71e49db\", \"datePublished\": \"2026-06-29T19:07:16.954Z\", \"assignerShortName\": \"EEF\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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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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Detection rules are retrieved from Rulezet.

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