Description
ARM mbed TLS before 2.1.11, before 2.7.2, and before 2.8.0 has a buffer over-read in ssl_parse_server_key_exchange() that could cause a crash on invalid input.
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 | 2.8.0-1 | — |
| Debian 13 | mbedtls | 2.8.0-1 | — |
| Debian 12 | mbedtls | 2.8.0-1 | — |
| Debian 9 | mbedtls | 2.4.2-1+deb9u4 | DLA-2826-1 |
| Debian 8 | polarssl | 1.3.9-2.1+deb8u4 | DLA-1518-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu 16.04 LTS | mbedtls | No fix yet | — |
SUSE
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| SUSE Package Hub 12 | mbedtls | 1.3.19-14.1 | openSUSE-SU-2018:1041-1, openSUSE-SU-2018:1039-1 |
Advisories 4
- DLA-2826-1 mbedtls - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-1518-1 polarssl - security update Debian Security (DSA / DLA) · Mar 9, 2026
- openSUSE-SU-2018:1041-1 Security update for mbedtls SUSE / openSUSE Security Updates · Feb 4, 2026
- openSUSE-SU-2018:1039-1 Security update for mbedtls SUSE / openSUSE Security Updates · Feb 4, 2026
References
- [debian-lts-announce] 20180925 [SECURITY] [DLA 1518-1] polarssl security update mailing-list
- https://github.com/ARMmbed/mbedtls/commit/a1098f81c252b317ad34ea978aea2bc47760b215
- https://tls.mbed.org/tech-updates/releases/mbedtls-2.8.0-2.7.2-and-2.1.11-released
- https://github.com/ARMmbed/mbedtls/commit/027f84c69f4ef30c0693832a6c396ef19e563ca1
- [debian-lts-announce] 20211123 [SECURITY] [DLA 2826-1] mbedtls security update mailing-list