CVE-2026-3549
CVE-2026-3549 · ECH parsing heap buffer overflow
This page contains facts from public vulnerability sources. Check the original advisory before updating.
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 · EPSS 0.5% · Fix available
- Published
- Updated
Stack: system
Affected products and versions
wolfssl
- Versions
- ≥ 0, < 5.9.0: Affected (semver)
Update to 5.9.0
wolfssl Debian:12
- Versions
- 5.5.4-2
- 5.5.4-2+deb12u1
- 5.5.4-2+deb12u2
- 5.5.4-2+deb12u3
- 5.5.4-2.1
- 5.6.4-1
- 5.6.4-2
- 5.6.6-1
- 5.6.6-1.1
- 5.6.6-1.2
- 5.6.6-1.3
- 5.6.6-1.3~exp1
- 5.7.0-0.1
- 5.7.0-0.2
- 5.7.0-0.3
- 5.7.2-0.1
- 5.7.2-0.2
- 5.7.2-0.3
- 5.7.2-0.4
- 5.8.2-1
- 5.8.2-1.1
- 5.8.2-1.2
- 5.8.4-1
- 5.9.0-0.1
- 5.9.0-0.2
- 5.9.1-0.1
- 5.9.2-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Debian:13
- Versions
- 5.7.2-0.1
- 5.7.2-0.1+deb13u1
- 5.7.2-0.1+deb13u2
- 5.7.2-0.2
- 5.7.2-0.3
- 5.7.2-0.4
- 5.8.2-1
- 5.8.2-1.1
- 5.8.2-1.2
- 5.8.4-1
- 5.9.0-0.1
- 5.9.0-0.2
- 5.9.1-0.1
- 5.9.2-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Ubuntu:16.04:LTS
- Versions
- 3.4.8+dfsg-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Ubuntu:18.04:LTS
- Versions
- 3.10.2+dfsg-2
- 3.12.0+dfsg-1
- 3.12.2+dfsg-1
- 3.13.0+dfsg-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Ubuntu:20.04:LTS
- Versions
- 4.1.0+dfsg-2
- 4.2.0+dfsg-1
- 4.2.0+dfsg-2
- 4.2.0+dfsg-3
- 4.3.0+dfsg-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Ubuntu:22.04:LTS
- Versions
- 4.6.0-3
- 5.0.0-1
- 5.1.1-1
- 5.2.0-1
- 5.2.0-2
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Ubuntu:24.04:LTS
- Versions
- 5.5.4-2
- 5.5.4-2.1
- 5.6.4-2
- 5.6.6-1.2
- 5.6.6-1.3
- 5.6.6-1.3build1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Ubuntu:25.10
- Versions
- 5.7.2-0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Ubuntu:26.10
- Versions
- 5.9.1-0.1
- 5.9.2-1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published
wolfssl Ubuntu:26.04:LTS
- Versions
- 5.7.2-0.1
- 5.8.2-1.2
- 5.8.4-1
- 5.9.1-0.1
- Affected ranges
- ECOSYSTEM: (−∞, +∞)
No fix published