CVE-2026-3549
Critical · 9.8CVSS
9.8
EPSS
0.6%
Published
Mar 19, 2026
CISA due date
—
The record
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 packages
| Ecosystem | Package | Introduced | Fixed |
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