CVE-2026-3549 — ECH parsing heap buffer overflow
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 o…
Published: 2026-03-19 · CVSS: 8.3 · CVSS 4.0
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.
Source: CVE Program · Revision 8b16575c39f1e1810c5e863010da073d2d3285e7