Description
Arm Mbed TLS before 2.19.0 and Arm Mbed Crypto before 2.0.0, when deterministic ECDSA is enabled, use an RNG with insufficient entropy for blinding, which might allow an attacker to recover a private key via side-channel attacks if a victim signs the same message many times. (For Mbed TLS, the fix is also available in versions 2.7.12 and 2.16.3.)
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 | 2.16.3-1 | — |
| Debian 13 | mbedtls | 2.16.3-1 | — |
| Debian 12 | mbedtls | 2.16.3-1 | — |
| 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 1 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Ubuntu Pro 18.04 LTS | mbedtls | No fix yet | — |
Alpine
Security tracker ↗| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.24 | mbedtls +2 | 2.16.3-r0 | — |
| Alpine v3.23 | mbedtls +1 | 2.16.3-r0 | — |
| Alpine v3.22 | mbedtls +1 | 2.16.3-r0 | — |
| Alpine v3.21 | mbedtls +1 | 2.16.3-r0 | — |
| Alpine v3.20 | mbedtls +1 | 2.16.3-r0 | — |
Show 10 more (older releases, extended support, other products)Fewer releases
| Release | Package | Fixed in | Advisory |
|---|---|---|---|
| Alpine v3.19 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.18 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.17 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.16 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.15 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.14 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.13 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.12 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.11 | mbedtls | 2.16.3-r0 | — |
| Alpine v3.10 | mbedtls | 2.16.3-r0 | — |
Advisories 1
- DLA-3249-1 mbedtls - security update Debian Security (DSA / DLA) · Mar 9, 2026
References
- https://tls.mbed.org/tech-updates/security-advisories/mbedtls-security-advisory-2019-10
- FEDORA-2019-1240f0fe43 vendor-advisory
- https://github.com/ARMmbed/mbedtls/commit/298a43a77ec0ed2c19a8c924ddd8571ef3e65dfd
- https://github.com/ARMmbed/mbedtls/commit/33f66ba6fd234114aa37f0209dac031bb2870a9b
- FEDORA-2019-07940971b2 vendor-advisory
- FEDORA-2019-89891f3e4a vendor-advisory
- [debian-lts-announce] 20221225 [SECURITY] [DLA 3249-1] mbedtls security update mailing-list