CVE-2026-3549
ECH parsing heap buffer overflow
- State
- Published
- Severity
- 8.3 High
- Published
- Mar 19, 2026
- Updated
- Mar 24, 2026
- Reserved
- Mar 4, 2026
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.
Scores
| CVSS | Score | Vector | Source |
|---|---|---|---|
| 4.0 | 8.3 High | 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 | wolfSSL |
Weaknesses
- CWE-122 Heap-based buffer overflow
Affected Products
| Product | Versions |
|---|---|
wolfSSLwofSSL |
|
References
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