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Affected Component
Analysis
wolfssl
Exploitable
Name
CVE-2026-3849
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.
CWEs
Published Date
Updated Date
Workaround
-
Advisories
https://github.com/wolfSSL/wolfssl/pull/9737Issue Tracking
Analysis#
Vulnerability Ratings#
6.9
CVSSv4
9.8
CVSSv31
NaN
other