CVE-2026-3549
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.
- Affected products
- Wolfssl
- Wolfssl
- < 5.9.0
- CVSS 3.1
- 9.8 CRITICAL
- EPSS
- 0.5% (39th percentile)
- Weakness
- CWE-122
- NVD status
- Analyzed
- Published
- 2026-03-19
CVE-2026-3549 at NVD
No indexed exploits for CVE-2026-3549 yet
Our index is partial: it proves presence, never absence
No exploit for CVE-2026-3549 has been indexed yet. Our index is built from live traffic and upstream syncs, so this page can only say what it knows — not that no exploit exists.