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Critical severity9.8NVD Advisory· Published Mar 19, 2026· Updated Jun 17, 2026

CVE-2026-3849

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.

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LLM-synthesized narrative grounded in this CVE's description and references.

Affected products

3
  • WolfSSL/Wolfssl3 versions
    cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*+ 2 more
    • cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:*range: >=5.6.0,<5.9.0
    • (no CPE)range: <5.8.4
    • (no CPE)range: v5.6.0-stable

Patches

Vulnerability mechanics

References

1

News mentions

0

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