CVE-2026-3849

CRITICAL

9.8

Beschreibung

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.

CVE Details

CVSS v3.1 Bewertung9.8

SchweregradCRITICAL

CVSS VektorCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

AngriffsvektorNETWORK

KomplexitatLOW

Erforderliche PrivilegienNONE

BenutzerinteraktionNONE

Veroffentlicht3/19/2026

Zuletzt geandert3/26/2026

Quellenvd

Honeypot-Sichtungen0

Betroffene Produkte

wolfssl:wolfssl

Schwachen (CWE)

CWE-787

Referenzen

https://github.com/wolfSSL/wolfssl/pull/9737(facts@wolfssl.com)

IOC Korrelationen

Keine Korrelationen erfasst

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