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JLSEC-2026-711 Medium 6.9

Stack Buffer Overflow in `wc_HpkeLabeledExtract` via Oversized ECH Config

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JLSEC Published
Modified
Severity
CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:L/VA:L/SC:N/SI:N/SA:N/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:D/RE:M/U:Amber
Affected Packages
wolfSSL_jll >= 5.7.2+0, < 5.9.2+0
Upstream
CVE-2026-3849 GHSA-267h-vrw9-53p3 EUVD-2026-13231

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.

References