Cyber Resilience

CVE-2026-5264

High

Published: 09 April 2026

Published
09 April 2026
Modified
13 April 2026
KEV Added
—
Patch
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CVSS Score v4 8.3 CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:N/VI:H/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
EPSS Score 0.0045 35.5th percentile
Risk Priority 55 floored blend · peak EPSS

Summary

CVE-2026-5264 is a high-severity Heap-based Buffer Overflow (CWE-122) vulnerability. Its CVSS base score is 8.3 (High).

Operationally, exploitation aligns with the MITRE ATT&CK technique Exploit Public-Facing Application (T1190); ranked at the 35.5th percentile by exploit likelihood (below the median); it is not currently listed in the CISA KEV catalog.

EU & UK References

Vulnerability details

Heap buffer overflow in DTLS 1.3 ACK message processing. A remote attacker can send a crafted DTLS 1.3 ACK message that triggers a heap buffer overflow.

CWE(s)
CWE-122

Related Threats

MITRE ATT&CK Enterprise TechniquesAI

T1190 Exploit Public-Facing Application Initial Access
Adversaries may attempt to exploit a weakness in an Internet-facing host or system to initially access a network.
attack.mitre.org →
T1210 Exploitation of Remote Services Lateral Movement
Adversaries may exploit remote services to gain unauthorized access to internal systems once inside of a network.
attack.mitre.org →
Why these techniques?

Remote crafted DTLS ACK message triggers heap buffer overflow (CWE-122), directly enabling exploitation of exposed DTLS services for RCE or DoS.

Confidence: HIGH · MITRE ATT&CK Enterprise v19.0

CVEs Like This One

CVE-2025-49668Shared CWE-122
CVE-2026-25588Shared CWE-122
CVE-2025-49729Shared CWE-122
CVE-2025-61944Shared CWE-122
CVE-2025-49672Shared CWE-122
CVE-2026-41096Shared CWE-122
CVE-2025-49669Shared CWE-122
CVE-2025-49674Shared CWE-122
CVE-2025-49753Shared CWE-122
CVE-2025-49663Shared CWE-122

Affected Assets

Mitigating Controls

No mitigating controls mapped yet. The per-CVE control annotator has not reached this CVE.

References