CVE-2026-3849
Buffer Overflow in HPKE via Oversized ECH Config
Summary
Buffer Overflow in HPKE via Oversized ECH Config
Original description
The description as published by the source.
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.
Fix status by distribution
Fixed packages published by each distribution for this CVE
- Debian DEBIAN-CVE-2026-3849 wolfssl
- Ubuntu UBUNTU-CVE-2026-3849 wolfssl
References
- advisory github.com
- advisory nvd.nist.gov
- patch github.com