Description
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.
Fixed in Linux distributions
Distributions backport fixes, so the version that fixes this vulnerability differs per release — upgrade to at least the version shown. From the distributions' security trackers and advisories.
Debian
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Debian 14 | mbedtls | 3.6.6-0.1 | — |
| Debian 13 | mbedtls | 3.6.6-0.1~deb13u1 | — |
| Debian 12 | mbedtls | No fix yet | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 26.10 | mbedtls | No fix yet | — |
| Ubuntu 26.04 LTS | mbedtls | No fix yet | — |
| Ubuntu 25.10 | mbedtls | No fix yet | — |
| Ubuntu 16.04 LTS | mbedtls | No fix yet | — |
Show 4 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 24.04 LTS | mbedtls | No fix yet | — |
| Ubuntu Pro 22.04 LTS | mbedtls | No fix yet | — |
| Ubuntu Pro 20.04 LTS | mbedtls | No fix yet | — |
| Ubuntu Pro 18.04 LTS | mbedtls | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SLES for SAP 16.0 | ovmf | 202502-160000.5.1 | SUSE-SU-2026:22016-1 |
| SLES 16.0 | ovmf | 202502-160000.5.1 | SUSE-SU-2026:22016-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mbedtls | 3.6.6-1.1 | openSUSE-SU-2026:10498-1 |
| openSUSE Tumbleweed | ovmf | 202602-9.1 | openSUSE-SU-2026:10615-1 |
Advisories 3
- SUSE-SU-2026:22016-1 Security update for ovmf SUSE / openSUSE Security Updates · Jun 9, 2026
- openSUSE-SU-2026:10615-1 ovmf-202602-9.1 on GA media SUSE / openSUSE Security Updates · Apr 26, 2026
- openSUSE-SU-2026:10498-1 libeverest-3.6.6-1.1 on GA media SUSE / openSUSE Security Updates · Apr 8, 2026