CVE-2026-3849

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.
NVD Severity
unknown
Other trackers
CVE, NVD, CERT, CVE Details, CIRCL, Arch Linux, Debian, Red Hat, Ubuntu, Gentoo, SUSE (Bugzilla), SUSE (CVE), Mageia
Mailing lists
oss-security, full-disclosure, bugtraq
Exploits
Exploit DB, Metasploit
Forges
GitHub (code, issues), Aports (code, issues)

References

Type URI
facts@wolfssl.com https://github.com/wolfSSL/wolfssl/pull/9737

Match rules

CPE URI Source package Min version Max version
cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:* wolfssl >= 5.6.0 < 5.9.0

Vulnerable and fixed packages

Source package Branch Version Maintainer Status
wolfssl edge-community 5.9.0-r0 Pavlo Dembytskyi <me@devs.boo> fixed
wolfssl edge-community 5.8.4-r2 Pavlo Dembytskyi <me@devs.boo> possibly vulnerable
wolfssl edge-community 5.8.4-r1 None possibly vulnerable
wolfssl edge-community 5.8.2-r1 None possibly vulnerable
wolfssl edge-community 5.8.2-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.7.6-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.7.4-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.7.2-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.7.0-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl edge-community 5.6.6-r0 None possibly vulnerable
wolfssl edge-community 5.6.2-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable
wolfssl 3.23-community 5.9.1-r0 Jakub Jirutka <jakub@jirutka.cz> fixed
wolfssl 3.23-community 5.8.2-r0 Jakub Jirutka <jakub@jirutka.cz> possibly vulnerable