CVE-2026-3849
Critical · 9.8CVSS
9.8
EPSS
0.8%
Published
Mar 19, 2026
CISA due date
—
The record
Stack Buffer Overflow in wc_HpkeLabeledExtract via Oversized ECH Config. A vulnerability existed in wolfSSL 5.8.4 ECH (Encrypted Client Hello) support, where a maliciously crafted ECH config could cause a stack buffer overflow on the client side, leading to potential remote execution and client program crash. This could be exploited by a malicious TLS server supporting ECH. Note that ECH is off by default, and is only enabled with enable-ech.
Affected packages
| Ecosystem | Package | Introduced | Fixed |
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