CVE-2026-53429Public exploit

BEAM node crash via escaped-tag memory leak

Published Jun 29, 2026 · Updated Jun 29, 2026

Memory leak in MDEx 0.11.0 before 0.12.3 and MDExNative 0.1.0 before 0.2.3 allows attackers to crash the BEAM node. The From conversion passes each attacker-controlled literal to Box::leak, creating an unreclaimable native allocation on every render. Exploitation requires an application to render a supplied escaped-tag document; repeated renders exhaust process memory and crash every service on that BEAM node.

CVSS severity6.9
Medium
EPSS probability0.18%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Memory leak in MDEx 0.11.0 before 0.12.3 and MDExNative 0.1.0 before 0.2.3 allows attackers to crash the BEAM node. The From conversion passes each attacker-controlled literal to Box::leak, creating an unreclaimable native allocation on every render. Exploitation requires an application to render a supplied escaped-tag document; repeated renders exhaust process memory and crash every service on that BEAM node.

The record

CVE
CVE-2026-53429
Published
Jun 29, 2026
Updated
Jun 29, 2026
Vendor
Leandro Pereira
Product
MDExNative
Classifications
CWE-401, CAPEC-130, T1499
Attack vector
local
Privileges
unauthenticated

Timeline

How it unfolded

  1. Jun 29, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 29, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=0.1.0 <0.2.3
  2. Affected versionversion=956528c5e31746253347029e810a969ab916fd27 <cbd927fb5061b488de8d90a8ef6df65718ca1fe6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesunauthenticated

What is affected?

Leandro Pereira · MDExNativeversion=0.1.0 <0.2.3; version=956528c5e31746253347029e810a969ab916fd27 <cbd927fb5061b488de8d90a8ef6df65718ca1fe6
Leandro Pereira · MDExversion=0.11.0 <0.12.3; version=81e4d14dd3aa5b206e395c7f372b9b413793015f <6ed94d905f97af188323f042698ae841c02293b4

Published CVSS scores

6.9Erlang Ecosystem FoundationCVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitPublished

Weakness, pattern, technique

CWE-401Missing Release of Memory after Effective Lifetime
CAPEC-130Excessive Allocation
T1499Endpoint Denial of Service

Public exploit references

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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