CVE-2026-3549 is a critical heap overflow vulnerability affecting wolfSSL, specifically within its TLS 1.3 ECH parsing logic, where an integer underflow can lead to out-of-bounds writing. Rated 9.8 Critical, this remotely exploitable flaw has low attack complexity and could severely impact confidentiality, integrity, and availability, though ECH is disabled by default in wolfSSL. Currently, there is no evidence of active exploitation, public exploit code, or significant community attention surrounding this vulnerability.
| Vendor | Product | Version(s) | CPE |
|---|---|---|---|
< 5.9.0CPE matchmatch criteria | cpe:2.3:a:wolfssl:wolfssl:*:*:*:*:*:*:*:* |
CVSS version used by this source: 4.0
CVSS:4.0/AV:N/AC:L/AT:P/PR:N/UI:N/VC:L/VI:L/VA:H/SC:L/SI:L/SA:L/E:X/CR:X/IR:X/AR:X/MAV:X/MAC:X/MAT:X/MPR:X/MUI:X/MVC:X/MVI:X/MVA:X/MSC:X/MSI:X/MSA:X/S:X/AU:X/R:X/V:X/RE:X/U:X
The average CVE in this peer group has 0.0 Twitter, 0.1 Reddit, 0.3 Bluesky, 0.3 Mastodon, and 2.4 GitHub mentions.
No media coverage found for this CVE.
The average CVE in this peer group has 0.3 InfoSec Media, 0.0 Vendor Blog, and 0.0 Security Researcher mentions.