Vulnerability details
CVE-2026-3549
wofSSL wolfSSL
ECH parsing heap buffer overflow
CVSS 4.0
8.3High
Official description
Heap Overflow in TLS 1.3 ECH parsing. An integer underflow existed in ECH extension parsing logic when calculating a buffer length, which resulted in writing beyond the bounds of an allocated buffer. Note that in wolfSSL, ECH is off by default, and the ECH standard is still evolving.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 8.3High | 4.0 | CVEProject cvelistV5 (CNA) (wolfSSL) | 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 |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| wofSSL | wolfSSL | v < 5.9.0 | CVEProject cvelistV5 (CNA) |
References and advisories
1
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Details
- Published
- 2026-03-19
- Last updated
- 2026-03-24
- State
- Published
- Assigner (CNA)
- wolfSSL
Exploit prediction (EPSS)
0.5%
Probability of exploitation in 30 days
43.5%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- Yes
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- CWE-122Heap-based buffer overflow