In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.
CVE-2026-73064 is fixed in mbedtls on 1 platform by DEBIAN-CVE-2026-73064 (version 3.6.7-1), released September 26, 2026. It is not reported as exploited. Patch Radar priority: Routine.
In Mbed TLS 3.2.0 though 3.6.6 and 4.0.0 through 4.1.0, an attacker who can cause an entropy source to fail can remove or inject bytes into the start of the TLS stream. This only affects TLS 1.3 servers.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mbedtls · Debian 14 | 3.6.7-1 | DEBIAN-CVE-2026-73064 | Sep 26, 2026 |
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