CVE-2026-53429— Leandro Pereira MDExNative 资源管理错误漏洞
一分钟漏洞结论
影响对象
leandrocp mdex
利用判断
尚无明确在野利用证据，仍需结合暴露面评估
建议动作
优先检查厂商安全公告和参考链接中的修复版本；无法立即升级时，限制受影响服务暴露并加强监测。
Leandro Pereira MDExNative是加拿大Leandro Pereira个人开发者开源的一个服务器支撑系统。 Leandro Pereira MDExNative存在资源管理错误漏洞，该漏洞源于有效生命周期后内存未释放问题，可能导致控制已渲染文档的攻击者通过无界本机内存耗尽造成拒绝服务。
影响版本矩阵 4
| 厂商 | 产品 | 版本范围 | 状态 |
|---|---|---|---|
| leandrocp | mdex | 0.11.0< 0.12.3 |
affected |
81e4d14dd3aa5b206e395c7f372b9b413793015f< 6ed94d905f97af188323f042698ae841c02293b4 |
affected | ||
| leandrocp | mdex_native | 0.1.0< 0.2.3 |
affected |
956528c5e31746253347029e810a969ab916fd27< cbd927fb5061b488de8d90a8ef6df65718ca1fe6 |
affected |
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一、 漏洞 CVE-2026-53429 基础信息
漏洞信息
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Vulnerability Title
Unbounded native memory leak in mdex escaped-tag rendering enables unauthenticated denial of service
来源: CVE Program / CVE List V5
Vulnerability Description
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.
来源: CVE Program / CVE List V5
CVSS Information
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
来源: CVE Program / CVE List V5
Vulnerability Type
在移除最后引用时对内存的释放不恰当(内存泄露)
来源: CVE Program / CVE List V5
Vulnerability Title
Leandro Pereira MDExNative 资源管理错误漏洞
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Description
Leandro Pereira MDExNative是加拿大Leandro Pereira个人开发者开源的一个服务器支撑系统。 Leandro Pereira MDExNative存在资源管理错误漏洞，该漏洞源于有效生命周期后内存未释放问题，可能导致控制已渲染文档的攻击者通过无界本机内存耗尽造成拒绝服务。
来源: 中国国家信息安全漏洞库 CNNVD
CVSS Information
N/A
来源: 中国国家信息安全漏洞库 CNNVD
Vulnerability Type
N/A
来源: 中国国家信息安全漏洞库 CNNVD
受影响产品
| 厂商 | 产品 | 影响版本 | CPE | 订阅 |
|---|---|---|---|---|
| leandrocp | mdex | 0.11.0 ~ 0.12.3 |
cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*
|
|
| leandrocp | mdex | 81e4d14dd3aa5b206e395c7f372b9b413793015f ~ 6ed94d905f97af188323f042698ae841c02293b4 |
cpe:2.3:a:leandrocp:mdex:*:*:*:*:*:*:*:*
|
|
| leandrocp | mdex_native | 0.1.0 ~ 0.2.3 |
cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*
|
|
| leandrocp | mdex_native | 956528c5e31746253347029e810a969ab916fd27 ~ cbd927fb5061b488de8d90a8ef6df65718ca1fe6 |
cpe:2.3:a:leandrocp:mdex_native:*:*:*:*:*:*:*:*
|
|
二、漏洞 CVE-2026-53429 的公开POC
| # | POC 描述 | 源链接 | 神龙链接 |
|---|
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CVE-2026-53429 补丁与修复 (1)
CVE-2026-53429 厂商安全公告 (3)
同批安全公告 · leandrocp · 2026-06-29 · 共 6 条
| CVE-2026-53426 | leandrocp mdex 资源管理错误漏洞 | |
| CVE-2026-53428 | leandrocp mdex 资源管理错误漏洞 | |
| CVE-2026-53427 | leandrocp MDExNative 跨站脚本漏洞 | |
| CVE-2026-54888 | leandrocp mdex 资源管理错误漏洞 | |
| CVE-2026-54889 | leandrocp mdex 跨站脚本漏洞 |
IV. Related Vulnerabilities
V. Comments for CVE-2026-53429
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