mbedtls: An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0
CVE-2026-34874 is fixed in 2 products on 1 platform, first by DEBIAN-CVE-2026-34874, released April 1, 2026. It is not reported as exploited. Patch Radar priority: High.
An issue was discovered in Mbed TLS through 3.6.5 and 4.x through 4.0.0. There is a NULL pointer dereference in distinguished name parsing that allows an attacker to write to address 0.
Where it's fixed
| Product | Fixed in | Fix | Released |
|---|---|---|---|
| Linux | |||
| mbedtls · Debian 13.5 (trixie) | 3.6.6-0.1~deb13u1 | DEBIAN-CVE-2026-34874 | Apr 1, 2026 |
| mbedtls · Debian 14 | 3.6.6-0.1 | DEBIAN-CVE-2026-34874 | Apr 1, 2026 |
| ovmf · sles 16.0 | 202502-160000.5.1 | SUSE-SU-2026:22016-1 | Jun 2, 2026 |
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