VDB
CVE-2026-3849
CVE-2026-3849
PUBLISHED
CVSS 6.900000095367432 MEDIUM
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.
EPSS 0.23% · 45.4th percentile
Risk Scores
CVSS v4.0
6.900000095367432
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/V:D/RE:M/U:Amber
EPSS Score
0.23%
45.4th percentile
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| wolfssl | wolfssl | 5.6.0, 5.6.0, 5.6.0 |
| wolfSSL Inc. | wolfSSL | v5.6.0-stable, v5.6.0-stable, v5.6.0-stable |
Timeline
- Mar 19, 2026 CVE Published
- Mar 19, 2026 PoC Published
- Mar 20, 2026 EPSS Score
- Mar 20, 2026 Coalition ESS Score
- Mar 21, 2026 EPSS Score
- Mar 21, 2026 Coalition ESS Score
- Mar 22, 2026 EPSS Score
- Mar 23, 2026 EPSS Score
- Mar 24, 2026 EPSS Score
- Mar 25, 2026 EPSS Score
- Mar 25, 2026 CVE Updated
- Mar 29, 2026 Security Advisory