Description
In Mbed TLS 3.6.x before 3.6.7 and 4.1.x before 4.1.2, the TLS 1.3 client accepts HelloRetryRequest selecting an unadvertised group.
Affected products
| Vendor | Product | Affected | Fixed |
|---|---|---|---|
| TrustedFirmware | Mbed TLS | 3.5.0 – < 3.6.7, 4.0.0 – < 4.1.2 | 3.6.7 |
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 | 3.6.7-2 | — |
| Debian 13 | mbedtls | No fix yet | — |
| 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 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 | — |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mbedtls | 4.2.0-1.1 | openSUSE-SU-2026:11215-1 |
| openSUSE Tumbleweed | mbedtls-3 | 3.6.7-1.1 | openSUSE-SU-2026:11267-1 |
| openSUSE Leap 16.0 | mbedtls | 3.6.7-bp160.1.1 | openSUSE-SU-2026:21865-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mbedtls | 4.1.1-r0 | — |
| Alpine v3.24 | mbedtls3 | 3.6.7-r0 | — |
| Alpine v3.23 | mbedtls | 3.6.7-r0 | — |
| Alpine v3.22 | mbedtls | 3.6.7-r0 | — |
| Alpine v3.21 | mbedtls | 3.6.7-r0 | — |
Azure Linux
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Azure Linux 3 | nodejs | No fix yet | — |
Advisories 3
- openSUSE-SU-2026:21865-1 Security update for mbedtls SUSE / openSUSE Security Updates · Sep 17, 2026
- openSUSE-SU-2026:11267-1 libeverest-3.6.7-1.1 on GA media SUSE / openSUSE Security Updates · Jul 15, 2026
- openSUSE-SU-2026:11215-1 libmbedtls23-4.2.0-1.1 on GA media SUSE / openSUSE Security Updates · Jul 9, 2026