CVE-2026-5264 PUBLISHED

DTLS 1.3 ACK heap buffer overflow

Assigner: wolfSSL
Reserved: 31.03.2026 Published: 09.04.2026 Updated: 10.04.2026

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.

Metrics

CVSS 4.0

CVSS Vector: 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
CVSS Score: 8.3

Exploitability Metrics		Vulnerable System Impact Metrics		Subsequent System Impact Metrics
Attack Vector	Network	Confidentiality	None	Confidentiality	None
Attack Complexity	Low	Integrity	High	Integrity	None
Attack Requirements	Present	Availability	High	Availability	None
Privileges Required	None
User Interaction	None

CVSS 4.0

Product Status

Vendor	wolfSSL
Product	wolfSSL
Versions	Default: unaffected affected from 0 to 5.9.1 (excl.)

Credits

Sunwoo Lee, Korea Institute of Energy Technology (KENTECH) finder
Seunghyun Yoon, Korea Institute of Energy Technology (KENTECH) finder

References

https://github.com/wolfssl/wolfssl/pull/10076

Problem Types

CWE-122 Heap-based Buffer Overflow CWE