CVE-2026-3549ECH parsing heap buffer overflow
Updated under an hour ago ()
Does this affect you?
It affects wofSSL wolfSSL and 1 other product. Add what you run to find out whether that includes you.
No exploitation reported and no EPSS estimate yet.
Do this next
Free account, 1 product
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
- 8.3 HIGH (v4.0, CNA)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
- Weakness (CWE)
- CWE-122
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- wolfSSL
- NVD analysis
- Analyzed
- Record last updated
- Mar 23, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
wofSSL wolfSSL wofssl:wolfssl (from the name) | before 5.9.0 | CNA record |
wolfssl wolfssl wolfssl:wolfssl | before 5.9.0 | NVD |
References
- https://github.com/wolfSSL/wolfssl/pull/9817issue-tracking, patch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.