Description
An issue was discovered in Mbed TLS before 2.28.2 and 3.x before 3.3.0. There is a potential heap-based buffer overflow and heap-based buffer over-read in DTLS if MBEDTLS_SSL_DTLS_CONNECTION_ID is enabled and MBEDTLS_SSL_CID_IN_LEN_MAX > 2 * MBEDTLS_SSL_CID_OUT_LEN_MAX.
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 | 2.28.2-1 | — |
| Debian 13 | mbedtls | 2.28.2-1 | — |
| Debian 12 | mbedtls | 2.28.2-1 | — |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | mbedtls | No fix yet | — |
Show 3 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 |
|---|---|---|---|
| SUSE Package Hub 15 SP4 | mbedtls | 2.28.0-bp154.2.3.1 | openSUSE-SU-2022:10257-1 |
openSUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| openSUSE Tumbleweed | mbedtls-2 | 2.28.2-1.1 | openSUSE-SU-2024:12581-1 |
| openSUSE Tumbleweed | mbedtls-3 | 3.6.6-1.1 | openSUSE-SU-2026:11119-1 |
| openSUSE Leap 15.4 | mbedtls | 2.28.0-bp154.2.3.1 | openSUSE-SU-2022:10257-1 |
Advisories 5
- openSUSE-SU-2026:11119-1 libeverest-3.6.6-1.1 on GA media SUSE / openSUSE Security Updates · Jun 26, 2026
- openSUSE-SU-2022:10257-1 Security update for mbedtls SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2024:12581-1 libmbedcrypto7-2.28.2-1.1 on GA media SUSE / openSUSE Security Updates · Feb 4, 2026
- ICSA-24-046-11 Siemens SCALANCE XCM-/XRM-300 CISA ICS & IT advisories · Feb 13, 2024
- SSA-806742 SSA-806742: Multiple Vulnerabilities in SCALANCE XCM-/XRM-300 before V2.4 Siemens ProductCERT · Feb 13, 2024