critical9.8
CVE-2026-3549
Heap Overflow in TLS 1.3 ECH parsing.
Impact
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
| Vendor | Product | Affected versions |
|---|---|---|
| Wolfssl | Wolfssl | before 5.9.0 |