Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.
History

Thu, 19 Mar 2026 20:30:00 +0000

Type Values Removed Values Added
Description Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.
Title ECH parsing heap buffer overflow
Weaknesses CWE-122
References
Metrics cvssV4_0

{'score': 8.3, 'vector': 'CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L'}


cve-icon MITRE

Status: PUBLISHED

Assigner: wolfSSL

Published:

Updated: 2026-03-19T20:09:27.036Z

Reserved: 2026-03-04T18:44:13.820Z

Link: CVE-2026-3549

cve-icon Vulnrichment

No data.

cve-icon NVD

Status : Received

Published: 2026-03-19T21:17:12.823

Modified: 2026-03-19T21:17:12.823

Link: CVE-2026-3549

cve-icon Redhat

No data.

cve-icon OpenCVE Enrichment

No data.