Description
Mbed TLS v3.3.0 up to 3.6.5 and 4.0.0 allows Algorithm Downgrade.
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 | — |
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 Leap 16.0 | mbedtls | 3.6.6-bp160.1.1 | openSUSE-SU-2026:21144-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mbedtls +1 | 3.6.6-r0 | — |
| Alpine v3.23 | mbedtls | 3.6.6-r0 | — |
| Alpine v3.22 | mbedtls | 3.6.6-r0 | — |
| Alpine v3.21 | mbedtls | 3.6.6-r0 | — |
| Alpine v3.20 | mbedtls | 3.6.6-r0 | — |
Advisories 3
- openSUSE-SU-2026:21144-1 Security update for mbedtls SUSE / openSUSE Security Updates · Jun 30, 2026
- SUSE-SU-2026:22016-1 Security update for ovmf SUSE / openSUSE Security Updates · Jun 9, 2026
- openSUSE-SU-2026:10498-1 libeverest-3.6.6-1.1 on GA media SUSE / openSUSE Security Updates · Apr 8, 2026