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Vulnerability DatabaseCVE-2026-3849

CVE-2026-3849: 
wolfSSL vulnerability analysis and mitigation

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.

Source: NVD

Related wolfSSL vulnerabilities:

CVE ID

Severity

Score

Technologies

Component name

CISA KEV exploit

Has fix

Published date

CVE-2026-3549HIGH8.3
  • wolfSSLwolfSSL
  • wolfssl
NoYesMar 19, 2026
CVE-2026-3547HIGH7.5
  • wolfSSLwolfSSL
  • wolfssl
NoYesMar 19, 2026
CVE-2026-3849MEDIUM6.9
  • wolfSSLwolfSSL
  • cpe:2.3:a:wolfssl:wolfssl
NoYesMar 19, 2026
CVE-2026-4395LOW1.3
  • wolfSSLwolfSSL
  • wolfssl
NoYesMar 19, 2026
CVE-2026-4159LOW1.2
  • wolfSSLwolfSSL
  • cpe:2.3:a:wolfssl:wolfssl
NoYesMar 19, 2026

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