CVE-2026-3549
ECH parsing heap buffer overflow
Vexday Risk Score
21Low
SSVC decision (CISA)
Track
No exploitation signal → monitor
CVSS 8.3EPSS 0.5%KEV nãoPoC —Nuclei —Metasploit —Patch —
Lifecycle
19 Mar 2026Published on NVD
Recommendation: Monitor — no exploitation signal at the moment.
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.
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L
Affected products
wofSSL · wolfSSL