CVE-2026-3549CRITICAL 9.8EPSS p38.0%
CVE-2026-3549CVE-2026-3549
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.
Scoring
| CVSS 3.1 | 9.8 (CRITICAL) |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H |
| EPSS | 0.49% probability of exploitation · percentile 38.0% · 2026-06-19T12:03:05Z |
| Published | 2026-03-19 |
| Last modified | 2026-03-26 |
Underlying weaknesses· 1
References
1
| Type | Target | Confidence | Tier |
|---|---|---|---|
| Weakness | Heap-based Buffer Overflowcwe-122 | 0% | live |
Related by meaning· 6
Nearest entities by semantic similarity across the cs-graph corpus.