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01 Record

CVE-2026-53429

Unbounded native memory leak in mdex escaped-tag rendering enables unauthenticated denial of service

MediumPUBLISHEDCNA: EEF
CNA base score6.9 CVSS v4.0CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
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02 Description

Unbounded native memory leak in mdex escaped-tag rendering enables unauthenticated denial of service

03 Exploitation and scoring

Exploitation
Public exploit code exists. CISA's assessment records a public proof of concept. That is not a report of exploitation in the wild.
SSVC decision
  • ExploitationpocPublic proof-of-concept exploit code exists. Not a report of exploitation in the wild.
  • AutomatablenoAt least one step from reconnaissance to exploitation cannot be reliably automated.
  • Technical ImpactpartialSuccessful exploitation gives limited control of the vulnerable component.
CISA publishes the decision points, not a final SSVC decision. The decision also depends on mission and well-being impact, which is a property of your deployment rather than of the vulnerability.
EPSS probability
0.19% probability of exploitation activity in the next 30 days.
EPSS percentile
Equal to or higher than the score of 8.5% of scored records. A rank, not a probability.
NVD base score
6.9 (CVSS v4.0), scored by the NVD independently of the CNA.
NVD CVSS vector
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
NVD analysis status
Deferred. NVD last modified this record on 2026-10-25.
Red Hat severity
No Red Hat rating. Red Hat rates the CVEs that affect its products.

Exploit-prediction scores from FIRST. Independent scoring and analysis status from the NVD. Vendor severity from Red Hat. Exploitation assessment and catalog membership from CISA.

04 Metadata

Published
2026-06-29 19:07Z4 MO AGO
Last updated
2026-06-30 04:38Z4 MO AGO
Reserved
2026-06-09
Assigning CNA
EEF
Record state
PUBLISHED
Severity
Medium (CVSS 6.9)
CNA CVSS vector
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
Weaknesses
  • CWE-401Missing Release of Memory after Effective LifetimeVariant
Data version
5.2
Document digest
fe1cfbcfa8e27115087a93cbbad35e970c30819d280cb0ea095644558eedd608

05 Affected products

VendorProductVersionsPlatforms
leandrocpmdex0.11.0 to < 0.12.3, 81e4d14dd3aa5b206e395c7f372b9b413793015f to < 6ed94d905f97af188323f042698ae841c02293b4—
leandrocpmdex_native0.1.0 to < 0.2.3, 956528c5e31746253347029e810a969ab916fd27 to < cbd927fb5061b488de8d90a8ef6df65718ca1fe6—

06 References