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CVE-2026-3849
Published: Mar 19, 2026
Modified: Mar 25, 2026
PUBLISHED
Description
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.
| Vendor | Product | Versions |
|---|---|---|
wolfSSL Inc. | wolfSSL | affected v5.6.0-stable - <= v5.8.4-stable |
Weaknesses (CWE)
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