Description
Mbed TLS before 3.0.1 has a double free in certain out-of-memory conditions, as demonstrated by an mbedtls_ssl_set_session() failure.
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 | 2.28.0-0.3 | — |
| Debian 13 | mbedtls | 2.28.0-0.3 | — |
| Debian 12 | mbedtls | 2.28.0-0.3 | — |
| Debian 11 | mbedtls | 2.16.9-0.1+deb11u1 | DLA-4236-1 |
| Debian 10 | mbedtls | 2.16.9-0~deb10u1 | DLA-3249-1 |
Ubuntu
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| 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 | 2.28.8-1ubuntu0.1~esm1 | USN-8123-1 |
| Ubuntu Pro 22.04 LTS | mbedtls | 2.28.0-1ubuntu0.1~esm1 | USN-8123-1 |
| Ubuntu Pro 20.04 LTS | mbedtls | 2.16.4-1ubuntu2+esm1 | USN-8123-1 |
| Ubuntu Pro 18.04 LTS | mbedtls | 2.8.0-1ubuntu0.1~esm1 | USN-8123-1 |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mbedtls +2 | 2.16.12-r0 | — |
| Alpine v3.23 | mbedtls +1 | 2.16.12-r0 | — |
| Alpine v3.22 | mbedtls +1 | 2.16.12-r0 | — |
| Alpine v3.21 | mbedtls +1 | 2.16.12-r0 | — |
| Alpine v3.20 | mbedtls +1 | 2.16.12-r0 | — |
Show 8 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | mbedtls | 2.16.12-r0 | — |
| Alpine v3.18 | mbedtls | 2.16.12-r0 | — |
| Alpine v3.17 | mbedtls | 2.16.12-r0 | — |
| Alpine v3.16 | mbedtls | 2.16.12-r0 | — |
| Alpine v3.15 | mbedtls | 2.16.12-r0 | — |
| Alpine v3.14 | mbedtls | 2.16.12-r0 | — |
| Alpine v3.13 | mbedtls | 2.16.12-r0 | — |
| Alpine v3.12 | mbedtls | 2.16.12-r0 | — |
Advisories 3
- USN-8123-1 mbedtls vulnerabilities Ubuntu Security Notices (USN) · Apr 27, 2026
- DLA-4236-1 mbedtls - security update Debian Security (DSA / DLA) · Mar 9, 2026
- DLA-3249-1 mbedtls - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://github.com/ARMmbed/mbedtls/releases
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2021-12
- https://bugs.gentoo.org/829660
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.16.12
- https://github.com/ARMmbed/mbedtls/releases/tag/v2.28.0
- https://github.com/ARMmbed/mbedtls/releases/tag/v3.1.0
- [debian-lts-announce] 20221225 [SECURITY] [DLA 3249-1] mbedtls security update mailing-list